WO2000013428A2

WO2000013428A2 - Portable communication equipment with mode conversion property and mode conversion control system

Info

Publication number: WO2000013428A2
Application number: PCT/KR1999/000491
Authority: WO
Inventors: Bongrae Park
Original assignee: Comtrue Technologies Co., Ltd.
Priority date: 1998-08-26
Filing date: 1999-08-26
Publication date: 2000-03-09
Also published as: JP2002524940A; KR20000015759A; GB0104262D0; WO2000013428A3; AU5530799A; GB2358112A

Abstract

Disclosed is a portable communication device (5, 6) capable of creating a proper call mode according to the environment in which it is being used. The portable communication device includes a receiving unit for receiving a mode conversion signal adapted to convert a calling from an external transmitter (2) installed at an anti-noise place, and a mode converting unit for detecting the current call mode state when the mode conversion signal is inputted in order to convert the call mode to an environmentally friendly mode, or to a suitable mode (vibration mode, optical mode, weak sound mode) if the current call mode is a sound mode. Thus, the invention prevents neighboUrs' displeasure as it automatically converts the call mode of any portable communication device carried into and out of the antinoise place to the environmentally friendly mode.

Description

PORTABLE COMMUNICATION EQUIPMENT WITH MODE CONVERSION PROPERTY AND MODE CONVERSION CONTROL SYSTEM

Technical Field

This invention relates to a portable communication device, and particularly to a device capable of creating a proper call mode according to the environment in which it is being used.

Background Art

Mankind has developed modern communication and electricity through various transformations since the era of beacon fire or light. The essential requirements of communication are quickness, accuracy, and economy for the general public because the basic purpose of communication is to intermediate mutually vast amounts and types of information occurring among social constituents. Above all, as the basic requirements of communication, like quickness and accuracy, have been satisfied due to the development of communication technology, the interest in convenience and the buildup of utilities of communication equipment is increasing these days.

Portable communication equipment is divided broadly into pagers and portable communication terminals (such as cellular phones, PCS phones, etc.). In regard to these pagers and portable terminals, the subscriber is informed of an incoming call through vibration or a sound produced by the portable communication device if someone else calls the subscriber' number. Thus, the caller recognizes that his call to the subscriber is being processed through a ringback tone. But, as the use of such portable communication equipment is more popularized, there are greater instances of incoming call sounds bothering others in the vicinity as they may not appreciate the noise, especially in such places as theaters, libraries, classrooms, offices, laboratories, conference rooms, churches, mortuaries, emergency rooms, airports, etc.

Consequently, existing portable communication equipment usually possess a feature that enables users to convert the incoming call mode of a pager or portable mobile phone to either vibration or sound manually, according to the using environment.

But such manual conversion is a burden to the subscriber as he must check the current call mode each time he enters such a public place. Particularly, when a user enters a public place carrying a portable communication device set in the sound mode, the noise generated by an incoming call gives discomfort to others in the same vicinity.

Accordingly, a great amount of effort and study have been performed to settle this problem. One such attempt is the one that won the grand prize of the 1998 students' science invention contest, (reference in Jung-Ang Daily News in Korea, 7.23. 1998), or the wireless pager which is converted to the vibration mode if attached to the body and to the sound mode if separated from the body, by being automatically converted to the sound mode if being laid down and to the vibration mode if being set up.

But, this pager has the following shortcomings. That is, first, in case of placing the pager in a handbag or a suitcase, in or on clothes hanging on a hanger, or in any other case where the pager may not be attached to the body such as in an outer pocket of a winter coat, it is left in the sound mode.00

Second, there might be a case wherein the sound mode may be suitable even though attached to the body. That is, the sound mode may be allowed in a place with no need for the vibration mode or certain people may dislike vibrations near their bodies.

Third, it would be rather inconvenient for users who intend to utilize the benefit of using the device as an alarm clock and laying the pager down on the desk, which would put the device in the vibration mode.

Also, we might see the case such as the Israel Venture Firm Netra which disables a cellular phone useless by installing a jammer in a theater, church, hospital, etc. But, this case disables the communication of a cellular phone itself which may violate the communication right of wireless communication equipment.

Disclosure of the Invention

This inventor claims all existing problems would be solved if a portable communication equipment automatically recognizes its own call mode and converts its mode to a suitable mode in regard to its environment. That is, is the first object of this invention is to contrive a portable communication device which is automatically converted to an environmentally friendly mode in places requiring a quiet atmosphere (or where people dislike noise) or in other places, automatically converted to a user's desired mode.

The above mentioned environmentally friendly mode is a means including a low-pitched sound mode giving a weak degree of ringback tone to the extent of not disturbing others, (hereinafter, referred to as 'weak sound mode'), a vibration mode or an optical mode (a feature which allows a flashing signed in the event of an incoming call), etc. Especially, in the widest sense, the environmentally friendly mode includes a power off mode which cuts off calling when portable communication device is in places not allowing such noise.

This inventor recognized both hardware and software modification are possible in developing portable communication equipment with mode conversion property. But, in the context of current development tendency pursuing compactness of portable communication devices, software modification is more desirable than hardware modification . Accordingly, the second object of this invention is to develop a portable communication equipment which serves the function that automatically selects suitable call mode according to using environment while not spoiling compactness and lightweight

Also, it is not enough just to convert simply call mode in places where silence is extremely required (classroom, hospital, etc) or where call is forbidden (in airplane, etc) but the use of portable communication equipments must be controlled. Also, portable communication equipment will become more convenient if it is possible to choose conversion of call mode or controlling function of using portable communication equipment in an alternative way.

Consequently, the third object is to develop portable communication equipment that lowers electric power of portable communication equipment to minimum requisite power impossible for communication in places where silence is extremely required or where call is forbidden . Further, this inventor found that a device transmitting information about the conversion of call mode outside and a portable communication equipment recognizing this mode conversion information are necessary for the portable communication equipment to recognize the using environment .

Accordingly, the fourth object of this invention is to develop an environmentally friendly communication system which automatically sets the call mode of portable communication equipment carried in and out in places asking quiet atmosphere.

Also, the fifth object of this invention is to supply a mode conversion control system with brief materialization and low execution cost The mode conversion control system for attaining the objects includes transmitting means that transmits mode conversion signal of predetermined frequency band to convert call mode of portable communication equipment ; and a portable communication equipment that receives mode conversion signal from receiving means to automatically converts current state of call mode to an environmentally friendly mode, which is suitable to surroundings.

With regard to the first modality of mode conversion control system of this invention, the transmitting means generates the electronic wave of special frequency band (low frequency, super high frequency) , which is not used for communication and the portable communication equipment possesses separate receiving means for receiving the signal of this special frequency band. With regard to the first modality of mode conversion control system of this invention, the portable communication equipment includes the first antenna to transmit and receive control and aural signal according to allotted frequency with radio base station ; the second antenna to receive mode conversion signal of special frequency band for converting call mode ; mode conversion signal which automatically converts current call mode to the environmentally friendly mode if mode conversion signal from the second antenna is inputted.

With regard to the second modality about mode conversion control system of this invention, the receiving means transmits mode conversion signal of receiving frequency identical to receiving frequency for communication of portable communication equipment

Especially, this mode conversion signal has frequency band identical with CDMA forward channel, and is transmitted on pilot channel, and has particular PN sequence offset value that other base station doesn't use.

Also, With regard to the second modality about mode conversion control system of this invention, the portable communication equipment includes antenna device receiving forward signal transmitted from base station and mode conversion signal transmitted from transmitting means; a storing means for storing PN sequence offset value for mode conversion ; a mode conversion means which converts current call mode to the environmentally friendly mode if the receive signal received from antenna accords with the offset value for mode conversion stored in the storing means .

With regard to the third modality about mode conversion control system of this invention, the receiving means transmits mode conversion signal of shared frequency band similar to receive frequency band for communication.

This portable communication equipment of the third modality includes antenna device which receives forward signal transmitted form base station and mode conversion signal transmitted from the transmitting means; signal filtering means which extracts mode conversion signal by using frequency difference among receive signal received on the antenna device; a mode conversion means which converts current call mode to the environmentally friendly mode if the mode conversion signal extracted by signal filtering means is inputted. The fourth modality about mode conversion control system of this invention includes transmitting means for transmitting mode conversion signal which converts call mode of portable communication equipment to environment friendly mode and power off signal which switches off power supply of the portable communication equipment; portable communication equipment which converts current call mode to environment friendly mode when receiving mode conversion signal from the transmitting means and switches off power supply from battery when receiving power off signal.

Also, this 4 modality of portable communication equipment includes receiving means for receiving communication signal from base station and power off signal from transmitting means; discriminating means for discriminating communication signal , mode conversion signal and power off signal received from the receiving means ; mode conversion signal which converts current call mode to the environmentally friendly mode if mode conversion signal is retrieved from discriminating means; powering off means which switches off power supply from battery if power off signal is retrieved from discriminating means. At this point, the mode conversion signal and power off signal are characterized in that they are transmitted on CDMA pilot channel, given special PN sequence offset value which other base stations don't use and have each different offset value.

Also, the transmitting means includes switching means for converting alternatively transmission mode of mode conversion signal or that of power off signal.

This invention, with regard to portable communication equipment with sound mode and the environmentally friendly mode (vibration mode, weak sound mode, optical mode) , is about a portable communication equipment including receiving means which receives mode conversion signal for converting mode from external transmitting means installed at the anti-noise places; a mode converting means which detects current call mode or converts it to the environmentally friendly mode if it is sound mode and holds as it is if the environmentally friendly mode.

The 1 modality about the portable communication equipment is that the mode conversion signal applies frequency band identical with the control signal for communication transmitted from the base station and the receiving means includes an antenna device which can simultaneously receive both control signal for communication and mode conversion signal.

Also, the mode converting means includes the first storage means for storing code conversion code; the second storage means for storing current call mode state; and a control means which, if the receive signal received from the antenna device accords with the mode conversion signal stored in the first storage means, reads current call mode state stored in the second storage means and then converts it to the environmentally friendly mode if the read call mode is sound mode.

The mode conversion code has an offset value specially allotted for mode conversion among 512 PN sequence offset values allotted to CDMA pilot channel.

The 2 modality about the portable communication equipment has frequency band similar to receiving frequency of communication control signal transmitted from radio base station and the receiving means consists of an antenna device which can receive simultaneously both control signal for communication and mode conversion signal and a switching device which separates the receive signal into control signal for communication and mode conversion signal by using the frequency difference. The second modality about the portable communication equipment is that the mode conversion signal is the signal of special frequency band (low frequency band, super high frequency band) which portable communication equipments don't use and the receiving means includes a separate antenna which can receive mode conversion signal of this special frequency band.

The mode conversion means of second and the third modality about the portable communication equipment includes storing means which store current call mode; and control signal which detects current call mode stored in the storing means and then converts current call mode to the environmentally friendly mode in case of sound mode if mode conversion signal is inputted from the receiving means . Also, this invention, as for the portable communication equipment having sound mode and the environmentally friendly mode as call mode, is about a portable communication equipment which includes receiving means which receives mode conversion signal for converting call mode from external transmitting device installed at the anti-noise places; mode conversion means which converts current call mode to the environmentally friendly mode when carried into anti-noise places or restored to call mode before entering when carried out based on the mode conversion signal.

With regard to the first modality about the portable communication equipment, the mode conversion signal has frequency band identical to control signal for communication received from radio base band and the receive means includes an antenna device which can receive simultaneously both control signal for communication and mode conversion signal.

Moreover, the mode conversion means includes a discriminating means that discriminates whether the receive signal received from antenna is mode conversion signal or control signal for communication; a storing means which stores data for indicating current call mode; control means which reads current call mode state stored in storing means and then converts it to the environmentally friendly mode if it is sound mode, if the discriminating means discriminates the receive signal from the antenna device as a mode conversion signal and which converts current call mode to sound mode if receiving signal discriminated as mode conversion signal from the antenna device is not received for more than certain times and the current call mode state is the environmentally friendly mode.

At this point, the discriminating means discriminates pilot signal which has offset value specially allocated only for mode conversion not used in other base stations among 512 sequence offset values allotted to pilot channel of CDMA.

With regard to the second modality of the portable communication equipment, the mode conversion signal has frequency band similar to control signal for communication transmitted from radio base station and the receive means consists of an antenna device which can receive simultaneously both control signal for communication and mode conversion signal and a switching device which separates this receive signal into control signal for communication and mode conversion signal by using the frequency difference.

With regard to the third modality of the portable communication equipment, the mode conversion signal is the signal of special frequency band (low frequency, super high frequency ) which the portable communication equipments don't use, and the receiving means includes a separate antenna device which can receive mode conversion signals of this special frequency band.

At this point, the mode converting means includes storing means which stores data for indicating current call mode state ; a control means which, if mode conversion signal is received from the antenna device for mode conversion, reads current call mode stored in the memory means and then converts current call mode to the environmentally friendly mode if sound mode, or converses it to sound mode if mode conversion signal is not received for a certain time from the antenna device for mode conversion and current call mode state is the environmentally friendly mode.

With regard to the second or third modality of the portable communication equipment, the mode conversion includes storing means for storing current call mode state, former call mode state and the number of times receiving mode conversion signal ; a controlling means which discriminates the situation of in and out by reading the number of times receiving mode conversion signal stored in the storing means and which converts current call mode state to vibration mode when carried in or to former call mode state when being carried out. At this point, the control means decides it as the state of entering if the number of times receiving the read mode conversion signal is even and as the state of going out if odd.

This invention, as for the portable communication equipment having sound mode and the environmentally friendly mode as call mode, is about receiving means which receives mode conversion signal for converting call mode from external transmitting device and power off signal for switching off power supply from the battery; a discriminating means for identifying mode conversion signal and control communication signal; mode converting means which converts current call mode to the environmentally friendly mode if mode conversion signal is detected from the discriminating means; power control means which switches off power supply from the battery if power off signal is detected from the discriminating means; a portable communication equipment with the feature that the mode conversion signal and power off signal are transmitted from the CDMA pilot channel and special PN sequence offset values are given which other base stations don't use and the offset values are different each other, signal generating means which generates mode conversion signal of predetermined frequency band; About a portable communication equipment which receives mode conversion signal and then converts current call mode state to a call mode suitable for surrounding environment. Another feature of mode conversion control system is that it includes more than one sensing means for sensing passing objects installed at the entrance of anti-noise place; signal generating means which gets passing sensing signal and then generates mode conversion signal of frequency band which the portable communication equipment can recognize; and a portable communication equipment which receives mode conversion signal and then automatically converts the current call state to a call mode suitable for environment. Other objects and merits of this invention will be explained, and understood by the practice of this invention. Also, the objects and merits of this invention can be realized by associations and means on the appended patent claiming scope.

Brief Description of the Drawings

The appended drawing integrated in a specifications and constituting a part of the specifications shows current desirable execution example of invention and explains the principle of this invention with full explanation of following desirable execution example.

Fig. 1 indicates an schematic diagram of execution example on mode conversion control system based on this invention .

Fig. 2 indicates schematic diagram of another execution example on mode conversion control system based on this invention. Fig. 3 illustrates block diagram of the Fig..2

Fig. 4 illustrates block diagram of the 1 execution example about portable mobile phone based on this invention Fig. 5 illustrates block diagram of the 2 execution example about portable mobile phone based on this invention .

Fig. 6 illustrates flowchart of execution example about mode conversion processing applying to portable mobile phone of Fig.. 5.

Fig. 7 illustrates flowchart of another execution example of mode conversion processing applying to portable mobile phone of Fig.. 5

Fig. 8 illustrates block diagram of pager based on this invention.

Fig.9 illustrates block diagram of communication system based on this invention.

Fig.10 illustrates flowchart of an execution example about mode conversion processing program applying to the pager of the Fig. 9.

Fig.11 illustrates flowchart of another execution example about mode conversion processing program applying to the pager of the Fig. 9.

Fig. 12 illustrates block diagram of a portable wireless phone of the 3 execution example based on this invention.

Fig. 13 illustrates block diagram of a pager of the 3 execution example based on this invention.

Fig.14 illustrates flowchart for explaining the 4 execution example.

Fig. 15 illustrates block diagram of the environmentally friendly communication system of the 5 execution example.

Fig.16 illustrates flowchart for explaining power off processing of the 5 execution example.

Fig. 17 illustrates block diagram of the environmentally friendly communication system of the 6 execution example.

Fig.18 illustrates flowchart for explaining power off processing of the 6 execution example.

Best Mode for carrying out the Invention We explain in detail the following desirable execution example of this inventions on the base of appended drawing.

In explanation of this invention, identical reference symbols indicates the identical portions. Appended drawing Fig. 1 or Fig. 2 illustrate schematic configuration of mode conversion control system based on this invention.

Fig. 1 shows schematic external configuration about an execution example of mode conversion system based on this invention,

On Fig.. 1 is illustrated entrance of anti-noise place (including place asking quiet ambience and where people dislike noise) and a portable communication equipment carried near this entrance. As anti-noise places, we can cite library, theater, classroom, office, laboratory, conference room, temple, music hall, art gallery, conference room, mortuary, etc. Also, anti-noise places include places extremely asking stillness (like classroom, serious sickroom, etc) or where call is prohibited (inside airplane)

Further, it goes without saying that the entrance 1) can exist in plural in each place (such as. front gate and rear gate )

The portable communication equipment 5 and 6 includes wireless pager, cellular mobile phone terminal and PCS phone (personal communications service), etc. But, the portable communication equipments of this invention isn't necessarily confined to the expatiation. and they doubtlessly includes every mobile communication terminal which is easy for carrying and guarantees mobility.

On the inner top of the entrance 1 is installed an external transmitting device 2. This external transmitting device 2 is a generating means for generating signal of frequency band which the portable communication equipment 5,6 can recognize. In the case of Fig. 1 , the example in which the external transmitting device 2 is installed on the inner top of the entrance 10 is illustrated, however, it can be also installed on outer top, bottom or side of the entrance 1.

The portable communication equipment 5, 6 includes portable communication terminal 5 which has the configuration of Fig. 4, Fig. 5, Fig.5 and pager 6 which has the configuration of Fig. 8, Fig. 9, Fig. 13.

Accordingly, in case that the portable communication equipment 5, 6 possesses only one separate antenna for receiving mode conversion signal, the external transmitting device 2 generates electric of low or super high frequency band which are different from communication frequency for transmitting and receiving voice and data information.

Also, in case that the portable communication equipment 5, 6 possesses only one separate antenna for communication with base station like Fig. 5, Fig. 9, Fig. 12, Fig. 13, the external transmitting device should exist ln plural in order to generate electric wave corresponding to each receiving frequency for communication of the portable communication equipment. This is because the receiving frequency bands are different according to the type of cellular phone, PCS phone, pager and communication common carriers.

Fig.2 shows schematic external configuration about another execution example of mode conversion control system based on this invention. The system of Fig. 1 and that of fully explained Fig. 1 are almost identical. Only, in case of the system of Fig.2, the special feature is that optical sensors are installed in plural to sense the state of being carried out and into. As illustrated on Fig. 2, It is desirable to install each one optical sensors 3, 4 each on the top bottom of entrance 1 side. This optical sensors 3, 4 consists of light emitting portion and light receiving portion to cut off light. Like this, if light is cut off, the light receiving portion authorizes sensing signal on an object to control signal of Fig. 3. In accordance with this, control unit 13 instructs to the external transmitting device 14 generating of electric wave.

If the optical sensors 3, 4 are adequate for sensing on object . they are not necessarily attached only on the bottom and the top of side as Fig. 2. Accordingly, they may be installed at the diagonal edge of entrance 1. That is, it is a matter of fact that a communication common carrier concerned can enough design, modify the spot to install optical sensor with average knowledge.

Also, in the case of Fig. 2, we gave an example of transmissive optical sensor with light emitting portion and light receiving portion. But, sensing means are not necessarily confined to it, and it can be substituted with reflective optical sensor or other equivalents.

Also, between the 1,2 optical senor 11, 12 and control unit 13 is interposed an A/D converter. That is, analogue signals sensed in the 1,2 optical sensor are converted to digital signal which the control unit 13 can recognize through A/D converter 15.

Accordingly, when a user carrying portable communication equipment passes the entrance, the external transmitting device on upper side of entrance radiates electric wave of predetermined frequency band by the work of the 1, 2 optical sensor 3, 4. At this moment the control unit 13 makes the external transmitting device 2 work even if either 1 or 2 optical sensor works. That is, the 1 and 2 optical sensor 3,4 doesn't need to work simultaneously..

Also, the external transmitting device 2 can be installed both at the inner and outer side of entrance 1 so that portable communication equipment 5,6 might recognize the user's state of being in and out when converting mode. That is, the portable communication equipment 5, 6 can be manipulated to recognize by itself the state of being in and out by varying frequency band of electric wave generated from the external transmitting device installed at the inner and outer side of entrance 1 or by varying mode conversion code even though identical frequency band is established. A detailed contents will be described later. Also, the external transmitting device 2 of this invention might be installed not near the entrance, but also on the ceiling of anti-noise place to transmit electric wave over a regular radius. At this point, it is desirable to install the external transmitting device on the center of ceiling.

Following, we will examine in detail desirable execution examples of this invention by seeing an appended drawing.

The mode conversion control system of this invention consists of an external transmitting device and a wireless communication equipment. Following, we examine each by separating the external transmitting device and portable communication equipment.

A. External transmitting device.

An external transmitting device 2 is a device for transmitting control signal so that a portable communication equipment carried into anti-noise place might not make noise pollution.

Generally, noise pollution resulted in by portable communication equipment are widely divided into two kind. One is owing to excessive ringback tone of portable communication equipment. The other is owing to excessively loud talking of users using portable communication equipment .

The former problem can be settled by converting call mode of portable communication equipment from sound mode to the environmentally friendly mode.

But, the solution of the latter problem is just trusting users' scruple, morality or switching off call of portable communication equipment itself.

Consequently, to settle the former problem, an external transmitting device transmits mode conversion signal for converting call mode of portable communication equipment to the environmentally friendly mode.

Also, to solve the latter problem, the external transmitting device of this invention transmits power off signal for controlling electric power of portable communication equipment or channel off signal for cutting off speech call channel so that only character communication might be available.

First, we examine specific examples of this invention for transmitting mode conversion signal. 1. A case of transmitting electric wave of frequency band special frequency band) which portable communication equipment doesn't use.

Generally frequency band which portable wireless communication equipments applies for communication is set on standard, Consequently, the external transmitting device of this case should generate electric wave of those low frequency or super high frequency band which are not applied for radio communication. Absolutely, portable communication equipment corresponding to this case should include separate receiving means for receiving electric wave of low or super high frequency band from external transmitting device.

Also, each one of external transmitting device can be installed both on the inner and outer side of the entrance to discriminate whether the user carrying this portable communication equipment is in state of in or out. On this occasion, the transmission frequency band of each external transmitting device installed on inner and outer side should be different. Or, it is also possible to distinguish it by identically setting the transmission frequency band of external transmitting device installed on inner and outer side and discriminating the code loaded on the signal

We omit appending of concrete drawing and the explanation of configuration as any communication common carrier of mobile communication would be able to fairly design the concrete configuration of this external transmitting device to achieve the object of this invention.

2. The case of transmitting electric wave similar to that of receive frequency band similar to portable communication equipment.

In this case, external transmitting device should transmit the signal of frequency band similar to that of portable communication equipment. This external transmitting device can be installed in plural to transmit mode conversion signal on several portable communication equipment (cellular mobile phone, pager, PCS phone, etc) Or. one external transmitting device might be projected to transmit a series of mode conversion signal of each applicable frequency band on a regular period. We omit appending of concrete drawing and the explanation of configuration as any communication common carrier of mobile communication would be able to design concrete configuration of this external transmitting device . 3. The case of transmitting mode conversion signal of frequency identical with receive frequency for communication of portable communication equipment.

In this case, mode conversion signal which the external transmitting device differs according as whether corresponding portable radio communication equipment (especially, the case of cellular mobile phone) employs TDMA system or CDMA system. For example, a case when cellular mobile phone, the target of mode conversion, employs CDMA system, the external transmitting device transmits mode conversion signal of frequency band identical with forward CDMA channel. Particularly, in case of CDMA mobile phone system, the external transmitting device transmits mode conversion signal to achieve initial synchronism with mobile station by using pilot channel composed of 64 units of bit string. This pilot channel is a standard channel which a mobile station uses as phase standard for system acquiring, timing and coherent modulation.

In this case, mode conversion signal is distinguished from the pilot signal of other base station by using offset index specially allotted for mode conversion signal among 512 PN sequence offset.

Also, in accordance with frequency reuse concept, It will be possible to make the portable communication equipment recognize that current pilot signal is mode conversion signal by using PN sequence offset which cannot possibly be received on cell where current mobile station is located. In this case, the external transmitting device might transmit pilot signal with offset value which cannot possibly be received on cell where current external transmitting device is located by allotting it to mode conversion signal

Undoubtedly, the external transmitting device of this invention can transmit mode conversion signal not only on pilot channel but on synchronous channel of call channel, but this is undesirable when considering production cost of external transmitting device.

If cellular mobile phone, the target of mode conversion, employs TDMA system, the external transmitting device transmits mode conversion signal on control channels .

Finally, external transmitting device transmits mode conversion signal on initial access channel which portable communication equipment always checks on receive idle mode for synchronization with base station regardless of signal processing system of portable communication equipment, or the target of mode conversion.

Next we explain an example that the external transmitting device of this invention transmits power off signal for controlling the power of portable communication equipment of portable communication equipment or cuts off speech call channel so that only character communication might be available. 4. The case of transmitting power off signal for controlling power of portable communication equipment

Occasions when anti-noise places extremely ask stillness or prohibit calling like classroom, conference room, serious sickroom or inside plane, just converting call mode to the environmentally friendly mode cannot achieve the object of this invention.

On this occasion, to switch off the power supply of portable communication equipment is necessary.

Thus, the external transmitting device transmits signal for controlling power of portable communication equipment. At this moment, if portable communication equipment, the target of power off, receives power off signal from external transmitting device, it executes power off function according to power off processing program loaded in its ROM.

5. The case of receiving channel off signal which cuts off speech call channel so that only character communication might be available.

Also, in case of switching off the power of portable communication equipment like the 4, it may bring about discomfort to portable communication equipment users because communication itself is impossible. Therefore, in this case, the external transmitting device transmits electric wave including speech channel off signal and the corresponding portable communication equipment is made to cut off speech channel or call channel according as it receives this signal.

The concrete execution example about portable communication terminal which constructs mode conversion system which can appropriately activate against noise pollution by joining the external transmitting device will be explained following.

B . portable communication equipment

The configuration and operation of portable communication equipment applying to mode conversion control system of this invention are examined following with reference of appended drawing Fig. 4 or Fig. 16.

Embodiment 1.

This embodiment is the case when mode conversion signal is set on signal of special frequency band and portable communication equipment terminal possesses separate antenna for receiving this signal of special frequency band. Accordingly we can lead new communication culture by preventing noise pollution of ringback tone with easy installation of external transmitting device and simple hardware modification of portable communication terminal. External transmitting device 2 applying to this embodiment is a device generating electric wave of low or super high frequency band which portable communication equipment seldom uses for receiving data and voice information.

Also, the portable communication equipment of this embodiment possesses a separate antenna for receiving electric wave of the low or super high frequency band. Following, we explain configuration and operation of portable communication equipment about the first embodiment of this invention with Fig. 4 or Fig. 8.

On this point, Fig. 4 indicates schematic block diagram about cellular mobile phone of this embodiment.

As illustrated on Fig. 4, the cellular mobile phone of this invention consists of communication processing unit with antenna 21, liquid crystal display 22, key stroke unit 23, speaker 24, mike 25, switch (SW) 27, receive unit 31, transmission unit 29, speech synthesizing device 30, digital modulation - demodulation unit 31, signal process unit 32, speech codec 33, speech convert circuit 34, control unit 35, ROM 36, RAM 37 and mode conversion processing unit with antenna 56, receive unit 52.

The antenna 21 of communication process unit transmits and receives voice and data information with radio base station (not illustrated) according to allotted frequency band. On this moment, antenna 21 outputs (to receive unit 28) receive signal received from switch 27 and transmits transmission signal to radio base station inputted from transmit unit 29 through switch 27. The antenna 56 of mode conversion processing unit receives mode conversion signal of low or super high frequency band on external transmitting device installed at the entrance or ceiling of the anti-noise place.

Above mentioned, "mode conversion signal of low or high frequency band" is signal of frequency band which portable communication equipments like pager, cellular mobile phone and PCS phone, etc seldom use for communication. Accordingly it is hard for antenna 21 attached on the portable communication equipment, to receive signal of this frequency band for transmitting and receiving signal with base station.

Also, antenna 56 of the mode converting process unit 50 can be in stalled separated from a portable communication terminal. Like this case of antenna installation, which is separated from a terminal, same effect and function can be attained by connecting earphone terminal of terminal through communication line and connector .

Following, We define the frequency band which portable communication equipment radio uses for receiving data and voice information from radio base station as "general frequency" and the frequency band which external transmitting device 2 use for transmitting mode conversion signal as " special frequency". The switch 27 is converted and controlled by control unit 35, accesses to antenna 21 by converting the receive unit 28 and transmit unit 29, and normally accesses the antenna 21 and the receive unit 28, accesses antenna 21 and transmit unit 29.

The receive unit 28 receives the receive signal of receive frequency band set by speech synthesizing device 30 through switch 21 and outputs it to digital modulation

- demodulation unit 31 by amplifying it on predetermined amplification ratio.

Also, the receive unit 52 of mode conversion process unit 50 receives on antenna the mode conversion signal of preestablished special frequency band and outputs it to control unit 35 by converting it to digital signal after amplifying it to predetermined amplification ratio.

The transmit unit 29 transmits on the antenna 21 through the switch 21 transmission frequency band set by speech synthesizing device if transmitting signal is inputted from digital modulation demodulation unit 31

Speech synthesizing device 30 sets the frequency band in the receive unit 28 and the transmit unit 29 if oscillating frequency band is instructed by control unit. Digital modulation - demodulation unit 31 outputs to signal process unit 32 by digital demodulating the digital - modulated receive signal inputted from receive unit 28 and outputs to transmit unit 29 by digital - modulating the transmitting signal inputted from signal process unit 32 simultaneously.

Signal process unit 32 exchanges aural signal of receive and transmission between digital demodulation unit 31 and speech codec unit 33, exchanges control signal for communication between it and the control unit 35, simultaneously extracts real data of digital data received on predetermined time slot and add to digital data framed inside wireless phone head unit inputted from control unit to converts it to predetermined data form and then outputs it to the digital modulation-demodulation unit 31 by interposing it on predetermined time slot. The processing of signal process unit 32 is applicable to TDMA system and in case of CDMA system, it shall be different.

Speech codec unit 33 simultaneously expands the digital voice data extracted with APPCM system , etc. inputted from the signal process unit 32 to output it to speech convert circuit and extracts digital voice data inputted from speech convert circuit 34 with ADPCM system, etc to output it to the signal process unit 32. Speech convert circuit 34 consists of A/D converter D/A converter, etc and simultaneously converts digital voice data inputted form the speech codec 33 to analogue voice signal to output it to speaker 24 and converts analogue voice signal inputted from mike 25 to digital voice data to output it to speech codec 33.

Control unit 35 consists of CPU, etc and executes communication control process or call mode convert process according to call mode conversion or communication control process program of recorded inside the ROM 36 and controls each portion of the unit.

Also, the control unit 35 executes call mode conversion according to call mode conversion process program recorded inside ROM 36, which will be described later, if indication to liquid crystal of phone number inputted from key input unit 23 and mode conversion signal of special frequency band from antenna 56 are inputted. Rom 36 records communication control process program which control unit 35 executes and call mode conversion process program, etc. RAM 37 forms data area which temporarily records each kind of data necessary when control unit 37 executes communication control process and call mode conversion process. Particularly, in specific storage area inside RAM 37 or call register (not illustrated on the drawing) is stored current call mode state.

For example, in case of sound mode, "11" is stored and in case of vibration mode, "oo" and weak sound mode, is "10" The above mentioned " optical mode " means a call mode state that informs users of current call situation by lamp's flashing installed on external case of portable communication terminal when it is called by base station. Also, the "weak sound mode" means example a call mode state of weak ringback tone means a call mode state ringing to the degree of not giving displeasure to neighbors when portable communication terminal is called.

Consequently, if mode conversion signal is inputted to control unit 35, control unit 35 identifies data of current call mode state stored in RAM 37 or call register and then authorizes mode conversion control signal if the data is "11" and hold the current mode state as it is if "00", "01", "10".

Liquid crystal display 22 indicates all sorts of indication data inputted from control unit 35. Mode conversion unit 41 selects one among speaker for ringer 43, vibration motor 45, lamp for call according to mode conversion control signal authorized in control unit and drives it.

Speaker for ringer 43 informs users calling state through ringback tone when receiving signal and vibration motor does so by vibration.

The operation of this embodiment is explained as f ollows .

If a user carrying portable communication terminal of this embodiment enters anti-noise place, the external transmitting device 2 installed at the entrance or on the ceiling transmits mode conversion signal of special frequency band.

This mode conversion signal is received on the antenna 56 of portable radio terminal of this embodiment. Mode conversion signal received on antenna 56 is inputted to control unit after it is converted to digital signal through receive unit 52. At this moment control unit 35 sensors that not control signal for communication or aural signal but mode conversion signal is inputted and then executes call mode conversion process program recorded inside ROM 36.

That is, control unit 35 checks current call mode state stored in RAM 37 or call register if mode conversion signal is inputted. The above mentioned " current call mode state" means the call mode state of when mode conversion signal is inputted from the receive unit 52.

In case that this current mode state is sound mode, it outputs mode conversion signal instructing the conversion of mode to mode converting unit and in case of the environmentally friendly mode, it outputs mode conversion control signal to code converting unit 41.

At this moment, if mode conversion control signal instructing the mode conversion unit 41 to convert call mode is inputted, mode conversion unit 41 selects one among speaker for ringer 43, vibration motor 45, lamp for call and drives it. At this point, in case that mode selects especially weak sound mode, the volume of speaker for ringer is adjusted to minimum to the degree necessary for call.

When processing mode conversion, users should previously input by hand what to choose among several the environmentally friendly modes.

Fig. 8 shows the case that the first embodiment of this invention applies to a pager.

The pager of this embodiment includes call process unit like antenna 121, receive unit 128, decoder 131, control unit 135, ROM 136, RAM 137, liquid crystal display 122 and mode conversion process unit like antenna

156, receive unit 152, control unit 135, mode conversion unit 141. speaker for ringer 143, vibration motor 145.

The antenna 13 first receives call signal of general frequency band transmitted from radio base station for pagers and outputs this receive signal to the receive unit

128.

The antenna 156 receives mode conversion signal of special frequency band transmitted from external transmitting device of Fig. 1, Fig. 2 and outputs this to the receive unit 152.

The receive unit 128 receives the receive signal of established receive frequency band on antenna 131 and outputs it to decoder 131 by digital demodulating after amplifying the receive signal on predetermined amplification ratio.

The receive unit 152 receives the mode conversion signal of the established special frequency band on antenna 156 and then outputs it to control unit 135 by converting it to digital signal after amplifying it on predetermined amplification ratio.

Decoder 131 decodes receive signal digital- demodulated in receive unit 128, and if it is sent to itself, or it accords with ID cord received from ROM 136, then sends identifying signal and continuously received message signal to control unit 135. ROM 136 stores ID code and mode conversion process program which will be later described.

RAM 37 forms data area which temporarily records all sorts of data necessary when control unit 135 executes call control process and mode conversion process. Also, inside specific storing area of RAM or call register (not illustrated on drawing) is stored current call mode state. For example, "11" is stored when it is sound mode and "11" when vibration mode. Thus, if mode conversion signal is inputted to the control unit 135, it authorizes mode conversion control signal to mode conversion unit 141 if current call mode state stored in RAM 137 or in the call register is "11" or holds current mode state as it is if "00".

Liquid crystal display 122 displays all sorts of data inputted from control unit.

Mode conversion unit 141 selects and drives speaker for ringer 143 or vibration motor 145 according to mode conversion control signal authorized in control unit.

Speaker for ringer 143 informs a user call state by ringback tone and vibration motor 145 does by vibration when receiving signal.

Following, the operation of this embodiment is explained.

If a user carrying a pager of this embodiment enters the entrance of anti-noise place, an external transmitting device installed at the upper side of this entrance sensors the passing object and then transmits mode conversion signal of special frequency band.

This mode conversion signal is received on an antenna 156 of the pager. Mode conversion signal received on the antenna 156 is converted to digital signal through a receive unit 152 and then is inputted to control unit 135. At this moment, control unit 135 executes mode conversion processing program recorded inside ROM 136 as follows .

That is, control unit 135 checks current call mode stored inside RAM 137 if call mode conversion signal is inputted from receive unit 152. At this point, it outputs mode conversion signal instructing conversion of call mode to mode conversion unit 141 if current call mode is sound mode or outputs mode conversion control signal instructing holding of current call mode to mode conversion unit 141 if vibration mode.

According to this mode conversion control signal, mode conversion unit 141 selects and drives the speaker for ringer 143 or the vibration motor 145. Accordingly, in case that a user enter anti-noise place carrying the portable communication equipment of this embodiment, unpleasant ringback tone can be prevented which is generated when receiving signal by being converted to the environmentally friendly mode. As the the first embodiment can be variously modified by a communication common carrier, modified examples will be examined in the following.

Embodiment 1-1 (Modified example)

This modified example 1 (embodiment 1-1) is applicable to both portable wireless phone and pager. In following example, only an application to portable wireless phone is explained.

The case of embodiment 1 shows that a call mode is automatically converted to the environmentally friendly mode when a user carrying a portable wireless phone enters an anti-noise place. However, the first embodiment has a shortcoming that a user have to converts call mode by hand if he or she wants sound mode when he or she gets out of anti-noise place because the mode is still holding the environmentally friendly mode. Accordingly, this embodiment 1 is about a portable communication equipment with a function that call mode is restored to the mode of before entering when a user gets out. This modified example 1 is applied only to the case when an external transmitting is installed at the entrance of anti-noise place.

This modified example 1 is almost identical with the configuration of embodiment 1. Merely, it differs in information stored in ROM 36 and RAM 37 and the control system of the control unit 35 as follows. Inside RAM 37 of modified example 1 are stored data indicating "former mode state" and "the number of times receiving mode conversion signal" besides the data stored in RAM 37 of embodiment 1.

The above mentioned "former call mode state" means a call mode state just before that of being converted. That is, the former call mode state before entering is sound mode, if the mode before entering is sound mode and the mode after entering is vibration mode. Also, m case of reenteπng, the former call mode state is vibration mode which is the mode of after entering.

Also, "the number of times receiving mode conversion signal" is stored by two methods as follows. The one is the case that allots 2 bit (initial is "00") to data about the number of times receiving mode conversion signal and adds 1 each time the mode conversion is done. In this case, carry is generated and simultaneously reset each time the mode conversion which comes under the multiple of 4 is done. For example, in case of the seventh mode conversion is completed, the data about the number of times receiving mode conversion signal stored in RAM indicates "10". The other is the case that allots 1 bit (the initial is "1") to the data about the number of times receiving mode conversion signal and checks whether carry is generated or not each time the mode conversion is done.

In the two case, it is both easily detected whether the number of times receiving mode conversion signal is even or odd number. That is, In the former case it is easily detected by calculating the stored 2 bit data in terms of 10 antilog. Also, in the latter case, it can decide as odd if carry is done and as even if it is not done by checking whether carry is done.

Also, mode conversion processing program stored in the ROM 36 of this modified embodiment and the control system of the control unit 35 has difference as following from the embodiment 1. Following, we explain the operation of this modified example .

When a user enters the entrance of anti-noise place carrying the portable wireless phone of this modified example, the electronic wave generating device 2 transmits sensors and then transmits mode conversion signal of special frequency band.

This mode conversion signal is received on the antenna 56 of the portable phone 5. The mode conversion signal received on the antenna 56 is converted to digital signal through receive unit 56 and then is inputted to the control unit. At this moment, the control unit 35 executes mode conversion processing program recorded in the ROM 37 as following.

That is, the control unit 35 checks current call mode state stored in the ROM 37 and the number of times receiving mode conversion signal if mode conversion signal is inputted from the receive unit.

At this moment, if the number of times receiving mode conversion signal stored in the ROM 37 is even, and current call mode state is sound mode, the control unit 35 outputs mode conversion control signal to the mode conversion unit 41. Also, if the number of times receiving mode conversion signal stored in the ROM 37 is even and current call mode is the environmentally friendly mode, the control unit 35 outputs mode conversion signal instructing holding current call mode to the mode conversion unit 41.

On the other hand, if the number of times receiving mode conversion signal stored in the ROM 37 is odd, it decodes former call mode stored in the ROM 37 and then outputs mode conversion control signal instructing converting to a mode identical with the former call mode to the mode conversion unit 41.

According to this mode conversion control signal, mode conversion unit 41 can set suitable call mode by selecting the speaker for ringer 43 or the vibration motor 45. For example, when a user with the state of sound on mode (vibration mode) initially enters anti-noise place, the control unit recognizes that the number of times receiving mode conversion signals is even and then converts current call mode, or the sound mode (vibration mode) to vibration mode (holds as it is) . When the user gets out, the control unit recognizes that the number of times receiving mode conversion signals is odd and then converts current vibration mode to sound mode (holds as it is) by reading former call mode, or the sound mode (vibration mode) . When the user reenters, the control unit recognizes that the number of times receiving mode conversion signals is even and then converts current call mode, or the sound mode (vibration mode) to vibration mode

(holds as it is) . Like this method, call mode can be converted to a suitable one each time of entering and getting out. Also, the case of this modified example 1, like the embodiment 1, can have not only vibration mode but optical mode or weak sound mode as an the environmentally friendly mode .

Accordingly, the case of this modified example 1 has a special merit that the call mode of the portable communication equipment is converted to the environmentally friendly mode whenever a user enters anti- noise place, but to initially set mode (the environmentally friendly mode or sound mode) when getting out.

Embodiment 1-2 (Modified example 2)

This modified example is applicable to both pager and portable wireless phone. In this example, we explain the case applying to only portable wireless phone. The embodiment 1 is about automatically converting the call mode of portable communication equipment to the environmentally friendly mode when a user enters the entrance of anti-noise place. But, because the environmentally friendly mode is still held when he gets out through the entrance, it has a shortcoming that he or she has to convert call mode by hand if he or she wants sound mode.

Accordingly, this modified example 2 is about a portable communication equipment with a function of its being restored to call mode employed before entering (original mode) when the user gets out.

The configuration of this modified example 2 is substantially identical with that of embodiment 1. Merely, configuration like following is different each other.

This modified example 2, contrary to the modified example 1, is distinctive in that the external transmitting device is installed on each of inner and outer entrance and that it transmits mode conversion signal having different or identical frequency, but having different 2 antilog code. For example, the outer external transmitting device transmits "000000" signal of which all units of 6 bit are 0 and inner electric wave generating device transmits "111111" signal of which all units of 6 bit are 1. Accordingly, the control unit of this modified example discriminate whether the finally received mode conversion signal is "000000" or " 111111" and then coverts to the environmentally friendly mode (especially, vibration mode) if " 111111" by reading current call mode state or holds as it is if the environmentally friendly mode. Also, if finally received mode conversion signal is "000000", it converts current mode to the former mode by reading former call mode state. Accordingly, also in case of this modified example 2, it has the merit that the call mode of portable communication equipment is converted to the environmentally friendly mode whenever a user enters anti- noise place, and it is converted to the mode which the user initially set (the environmentally friendly mode or sound mode) when going out.

Embodiment 1-3 (modified example 3)

This modified example is applicable to both pager and portable wireless phone. In this example, we explain the case applying to only portable wireless phone.

The embodiment 1 is about automatically converting the call mode of portable communication equipment to the environmentally friendly mode when a user enters the entrance of anti-noise place. But, because the environmentally friendly mode is still held when he gets out through the entrance, it has a shortcoming that he or she has to convert call mode by hand if he or she wants sound mode. Accordingly, this modified example 2 is about a portable communication equipment with a function of its being restored to call mode employed before entering when the user gets out. The configuration of this modified example 3 is substantially identical with that of embodiment 1. Merely, configuration like following is different each other.

This modified example 3, contrary to the modified example 1 and 2, is distinctive in that the external transmitting device is installed on the ceiling of the entrance and the user's portable communication equipment in the place is in state of continuously receiving mode conversion signal transmitted on regular period. Accordingly, in case that the portable communication equipment is laid in anti-noise place, it is in state of receiving mode conversion signal from external transmitting device and in case of being carried out, it is laid in the state of not being able to receive the mode conversion signal any more

Accordingly, the control unit of portable communication equipment, if mode conversion signal is received and then isn't received for certain time (approximately one minute) , the control unit of portable communication terminal decides that portable radio terminal is carried out from the anti-noise place and then converts current the environmentally friendly mode to the original call mode through the identical process of the modified example 1 and 2.

Embodiment 2.

As above, both embodiment 1 and 1-3 of this invention indicate the case that portable communication equipment possesses separate antenna for receiving mode conversion signal. But like this case having separate antenna for receiving mode conversion signal, the aim of compactness and lightness of portable communication equipment can't be attained efficiently. According, this embodiment 2 has the feature that embodies a portable communication equipment whose compactness, lightness is attained as well as which has mode conversion function by making it to receive mode conversion signal and communication signal on one antenna. Particularly, the embodiment 2 has a feature that the frequency band of mode conversion signal is identical with the receiving frequency band of communication signal so that mode conversion signal and communication signal might be received on one antenna simultaneously.

A block diagram to which this embodiment applies is illustrate on Fig. 5 and Fig. 9.

First, the explanation of the configuration of portable wireless phone of this embodiment with reference to Fig. 5 is as follows.

The configuration of the portable wireless phone of Embodiment 2 is identical with that of the Embodiment 1. So we omit the explanation about the identical component of embodiment 1.

The control unit 35 consists of CPU, etc, and executes communication control process or call mode conversion according to the communication control process program or call mode conversion program recorded inside ROM 36 and controls each operation of the units recorded inside ROM 36. Also, if indication of phone number inputted from key input unit 23 to liquid crystal display 22, mode conversion signal of receive frequency band set from antenna 21 are inputted, the control unit 35 executes conversion of call mode according to mode conversion process program recorded inside ROM 36.

The ROM 36 records the communication control program which control unit 36 executes, call mode conversion processing program and mode conversion code, etc. The call mode conversion processing program follows the flowchart of Fig. 6. The mode conversion code is a identifying code for discriminating the mode conversion signal transmitted from external transmitting device 2 and the communication signal . For example, mode conversion signal is set to be discriminated form ID code for communication which users generally use.

RAM 37 forms data area which temporarily records all sorts of data necessary for executing communication control processing and call mode conversion processing.

Also, inside RAM 37 or call register (not illustrated on the drawing) is restored current call mode.

Following, we explain the operation of this embodiment with reference to Fig. 6. First, referring to Fig. 6, if a user enters anti- noise place carrying the portable wireless phone of this embodiment, the external transmitting device 2 installed on the ceiling of the place transmits mode conversion signal of frequency band identical with the receive frequency of the portable wireless phone.

Mode conversion signal of this embodiment is received on the antenna 51 of portable wireless telephone. Mode conversion signal received on the antenna 51 is inputted to the control unit 35 after being digital demodulated through the receive unit 52

At this moment, the control unit 35 executes call mode conversion processing program of the flowchart illustrated on Fig.6.

First, control unit 35 decides whether there is any receive signal received on antenna 21 (step SI)

If existence of receive signal is identified in SI, the control unit 31 decides whether this receive signal is control signal for communication. That is, it decides whether receive signal accords with communication cord recorded inside the ROM 36. ( step S2)

At this moment, if the receive signal accords with communication cord , it executes communication control processing program recorded inside the ROM 36 by going to step S7.

If the receive signal is decided as not call paging signal in the step 2 (That is, the receive signal doesn't accords with communication cord) , the control unit 35 checks if the receive signal is mode conversion signal or not. That is, if decides whether the receive signal received on the antenna 21 accords with mode conversion cord recorded in ROM 36. (Step S3) If receive signal and mode conversion code accord each other in the step S3, the control unit 35 reads current call mode state recorded inside the RAM 37. (Step S4)

At this moment, the call mode is converted to the environmentally friendly mode if the current call mode is sound mode (Step S5)

On the contrary, if the current call mode is the environmentally friendly mode (step S5), mode conversion processing terminates with holding the environmentally friendly mode of call mode as it is.

In case of this .embodiment , control signal for communication and mode conversion signal which have identical frequency each other are received on one antenna. Thus, the external transmitting device should be able to transmit electric wave of various frequency bands according to the type of each portable wireless phone. For example, cellular mobile phone should be able to transmit mode conversion signal corresponding to Oil, 017 and PCS phone should be able to transmit frequency band corresponding to 018, 019.

Also, in case of this embodiment, because the control signal for communication and the mode conversion signal are received on one antenna 21, the control unit 35 discriminates whether the signal received in current is the control signal for communication or the mode conversion signal through code for communication loaded in ROM 36 and mode conversion code.

Accordingly, because this embodiment need not install separate an antenna for receiving mode conversion signal, it has a special merit to reduce production cost and to achieve the portable wireless phone's compactness and lightweight. On Fig. 9 is illustrated a block diagram of pager applying to this embodiment and on Fig. 10 is illustrated a flowchart of call mode conversion processing program which is executed in the pager of Fig. 9.

Also the case of the pager has configuration and operation identical with the portable communication phone. So we omit explanations about configuration and operation of pager based on this embodiment by substituting the portable wireless phone for it.

Embodiment 2-1 (modified example 1) The case of this modified example is applicable to both portable wireless phone and pager. In this example, we explain only the case that this modified example is applied to the portable wireless phone with reference to Fig.5 and Fig.7. The case of pager an be understood by consulting Fig. 9 and Fig. 11.

Like the embodiment 2, as the pager has configuration and operation identical with the portable wireless phone, we omit the explanation by substituting the portable wireless phone for it. The case of embodiment 2 shows that the call mode is automatically converted to the environmentally friendly mode. But, because the environmentally friendly mode is still held when the user gets out, it has a shortcoming that the user have to convert the call mode by hand if he or she wants sound mode. this modified example 1 is about a portable communication equipment with a function that it is automatically converted to the call mode which the user employed before entering when he or she gets out.

The configuration of this modified example 1 is almost identical with that of the embodiment 3. Merely, the information stored in the ROM 36 and the RAM 37 and control system of the control unit 35 is different as follows .

In RAM 37 of modified example 1 are stored former call mode state, the number of times receiving mode conversion signal besides the data of embodiment 2 stored in the RAM 37.

The above mentioned " former call mode state" means the call mode just before the call mode is converted. That is, if the mode before entering is sound mode and the mode after entering is vibration mode, the former call mode state is sound mode, or the mode before entering. Also, in case of reentering, the former call mode state is vibration mode, or the mode after entering. Also, the call mode conversion processing program stored in the ROM 36 of this modified example 1 and the control system of the control unit 35 have difference as follows .

Next, we explain the operation of this embodiment with reference to Fig. 7.

First, as illustrated on Fig. 7, if a user enters anti-noise place carrying the portable wireledd phone of this embodiment, the external transmitting device 2 installed on the ceiling of the entrance transmits mode conversion signal of frequency band identical with the receive frequency of the portable wireless phone. This mode conversion signal is received on the antenna 51 of a portable wireless phone of this embodiment. The mode conversion signal received on the antenna 51 is digital- demodulated through the receive unit and then is inputted to the control unit. At this point, the control unit 335 executes the call mode conversion processing program illustrated on the Fig. 7.

The control unit 35 decides whether any receive signal received on antennal 21 exists or not. (step Sll) If the receive signal is identified in the step Sll, the control unit 35 decides whether this receive signal is control signal for communication. (step S12)

At this moment, if passes to step S21 if the receive signal accords with communication code and then executes communication processing program recorded in the ROM 36.

If the receive signal is decided as not the control signal for communication (that is, if the receive signal doesn't accords with the communication code), the control unit 35 checks whether the receive signal is mode conversion signal or not. That is, it decides whether the receive signal received on the antenna 21 accords with mode conversion code recorded in the ROM 37 or not. (step S13)

If the receive signal and mode conversion code accords in the step S13, the control unit 35 reads the number of times receiving mode conversion signal recorded in the RAM 37 and then decides whether it is even or odd. ( step S 14 )

If the number of times receiving mode conversion signal is even, the control unit 35 reads current call mode state recorded in the RAM 37. (step S15) If the current call mode state read in the step S15 is sound mode (step S16) , it converts call mode to the environmentally friendly mode, (step S17)

On the other hand, if the current call mode state is the environmentally friendly mode (step S16) , it holds the call mode as the environmentally friendly mode and then terminates the mode conversion processing, (step S18)

If the number of times receiving the mode conversion signal in embodiment sl4 is odd, control unit 35 reads former call mode state recorded inside RAM 37 (Step S19) , and converts current call mode to former mode state. (Step

S20) .

Accordingly, in case of this embodiment 1, call mode of the portable communication equipment is converted to the environmentally friendly mode whenever a user enters anti-noise place, but restored to initially set mode (call mode before entering) when getting out.

Embodiment 2-2 (Modified example 2)

This modified example 2 is applicable to both portable wireless phone and pager. Following, only the case applying to portable wireless phone will be explained.

The case of embodiment 2 shows that the call mode is automatically converted to the environmentally friendly mode when a user enters anti-noise place. But it has a shortcoming that a user have to convert the call mode by hand if he or she wants sound mode because it still holds the environmentally friendly mode when a user gets out of the anti-noise place.

Accordingly, this modified example 2 is about a portable communication equipment with a function to be restored to call mode which a user used before entering.

The configuration of this modified example 2 is substantially identical with that of embodiment 2, merely different in the configuration as follows.

Contrary to the modified example 1, in modified example 2, external transmitting device is installed on the ceiling of anti-noise place, and the user's portable communication equipment is laid in a state of continuously receiving mode conversion signal transmitted on a regular period. Accordingly, if mode conversion signal is received and then isn't received for a certain time (approximately 1 minute), the control unit of portable communication terminal decides that portable wireless terminal is carried out of anti-noise place and thus converts the current the environmentally friendly mode to the original call mode through identical processing of the modified example 1.

Embodiment 3.

As above, both embodiment 2 and 3 of this invention indicate the case that frequency band of mode conversion signal received on the antenna of the portable communication equipment and that of control signal for communication are identical. But, to transmit mode conversion signal identically like the receive frequency band of the portable communication equipment, as each external transmitting device should possess every separate external transmitting device in every using frequency band of portable communication equipment, there exists a shortcoming of cost charge increasing That is, in case of Korea, to make the mode conversion possible, we should install the external transmitting device corresponding to each cellular mobile phone of Oil, 017 and PCS phone of 016, 018, 019.

Accordingly, this embodiment receives the receive signal for communication and the mode conversion signal on one antenna, but has the feature that it binds cellular phone, PCS phone, pager in one group ( precisely; 012, 015 group, 016, 108, 109 group) and thus decides frequency band which is in common in each group ( precisely, the frequency band of cellular phone or frequency band of pager) and then transmits mode conversion coing unter this frequency band and then separates this from control signal for communication inside the portable communication equipment .

Fig. 12 is a block diagram of a portable communication equipment applying to this embodiment.

The configuration of the portable communication equipment of this embodiment is almost identical with that of the portable communication equipment of the embodiment 1 and 2. So se omit the explanation about identical components of embodiment 1 and 2.

The antenna 221 transmits and receives data and aural signal of predetermined frequency band between the portable communication equipment and the radio base station, inputs the receive signal received from the first switch 227 to the second switch 251 and simultaneously transmits transmission signal inputted from the transmission unit 229. Also, it receives mode conversion signal of predetermined frequency band and then outputs it to the second switch 251 through the first switch.

The first switch 227 is converted and controlled by the control unit 235 and for the antenna 221, it accesses after converting the second switch 251 and the control unit 235 and normally it connects the antenna 221 and the second switch 251 or connects the antenna 221 and the transmission unit 229 when transmitting.

The second switch 251 accesses the signal which accords with the first receiving frequency band set through the speech synthesizing device 230 among receive signals inputted through the first switch by switching it to the first receiving unit 231 and accesses the signal which accords with the second receiving frequency band set through the speech synthesizing device 230 by switching it to the second receiving unit 252.

The first receiving frequency band means a frequency band of communication signal set so that portable communication equipment might receive control signal and aural signal from the base station. The second receiving frequency band means a frequency set so that portable communication equipment might receive the mode conversion signal. This second receiving frequency means a shared frequency which cellular phone 011, 017 and PCS phone 016, 018, 019 uses in common.

For example, the shared frequency band of 011, 017 which can be received on the cellular phone antenna and the shared frequency band of 016, 018,019 can be the second receiving frequency. Accordingly, the signal of this second receiving frequency band can be received on general cellular phone or PCS phone, but it is treated as noise for general cellular phone or PCS phone. Also in case of pagers this second receiving frequency band is set by deciding the shared frequency band of 012, 015.

Accordingly, the external transmitting device installed at the entrance or on the ceiling of anti-noise place should be able to transmit each mode conversion signal at least coming under the shared frequency band of pager, cellular phone, PCS phone.

The second switch 251 normally connects the first switch 227 and the receive unit 231 or it connects the first switch 227 and the second receiving unit 252 only when receiving mode conversion signal.

If a receive signal of the first receiving frequency band established by the speech synthesizing device 230 is received on the antenna 251 through the second switch 251, the first receiving unit 231 amplifies the receive signal on predetermined amplifying ratio and then outputs it to the digital modulation-demodulation unit 232.

If a receive signal of the second receiving frequency band established by the speech synthesizing device 230 is received on the antenna 251 through the second switch 251, the second receiving unit 252 amplifies the receive signal on predetermined amplifying ratio and then outputs it to the control unit 235 by digital-demodulating it.

If transmitting signal is inputted from the digital modulation-demodulation unit 232, the transmit unit 229 transmits from the antenna 221 through the first switch in transmit frequency band established by the speech synthesizing unit 230.

If an oscillating frequency band is instructed from the control unit 235, the speech synthesizing unit 230 sets the frequency band in the 1 and second receiving unit 231,252 and the transmit unit 29. The digital modulation-demodulation unit 232 digital demodulates the receive signal inputted from the first receiving unit 231 and then outputs it to the signal processing unit 233 and simultaneously digital modulates the transmit signal inputted from the signal processing unit 233.

The signal processing unit 233 exchanges the transmit and the receive aural signal between the digital modulation-demodulation unit 232 and the speech codec 234, exchanges control signal for communication between the control unit 235 and itself, extracts real data of digital data received on predetermined time slot, simultaneously adds a head unit inputted from the control unit 235 to the digital data written inside the wireless phone to converts it to a predetermined data form, and outputs it to digital modulation-demodulation unit 232. This case indicates an example that the portable wireless terminal applies TDMA system , so it can be different in case that the portable wireless terminal applies CDMA system. Speech codec 234 outputs to speech convert circuit 228 a digital data -in voice extracted with APPCM system, etc inputted from signal process unit 233 bye stretching it and simultaneously outputs to signal process unit 233 the digital data-in voice inputted from voice convert unit 228 by extracting it.

The speech convert unit 228 consists of A/D converter, D/A converter etc, and it outputs to the speaker 224 digital data in voice inputted from speech codec 234 by converting it to analogue aural signal at the same time it outputs to speech codec 234 the analogue aural signal inputted from mike 225 by converting it to digital data-in voice. The control unit 235 consists of CPU, etc, executes communication control processing or call mode conversion processing according to communication control process program or call mode process program recorded in the ROM 236, controls each operation of the units, and executes conversion of call mode according call mode conversion processing program recorded in the ROM 236 if indication of phone number inputted from key stroke unit 223 to liquid crystal, mode conversion signal of the second receiving frequency band from the second receiving unit 252 are inputted.

ROM 236 records the communication control processing program and the call mode conversion processing program, etc which the control unit 235 executes. RAM 237 forms data area which temporarily records all sorts of data necessary for executing communication control processing and mode conversion processing. Also, current call mode state is stored inside RAM 235. For example, it stores "11" in case of sound mode and "00" in case of vibration mode. Accordingly, if mode conversion signal is inputted to control unit 235, the control unit 235 reads current call mode stored inside the RAM 237 and then authorizes the mode conversion control signal to the mode conversion unit 241 if it is "11" or holds current call mode as it is if "00"

Liquid crystal display 222 indicates all sorts of indication data inputted from the control unit 235

The mode conversion unit 241 selects either the speaker for ringer 243 or the vibration motor 245 according to the mode conversion control signal authorized in the control unit 235 and drives it.

The speaker for ringer 243 informs a user of call state with ringback tone when receiving signal and the vibration motor 245 informs a user call state with vibration when receiving signal.

Following, the operation of this embodiment is explained.

When a user carrying the portable wireless phone of this embodiment enters an anti-noise place, an external transmitting device 2 installed on the top or ceiling of this entrance 1 sensors passing object and then transmits mode conversion signal coming under the shared frequency band (the second receiving frequency band) of the portable communication equipment.

This mode conversion signal is received on the antenna 221 of the portable wireless phone 221. The mode conversion signal of the second receiving frequency band received on the antenna 221 is separated from control communication signal of the first receiving frequency band through the second switch 251 and then is inputted to the control unit 235 after digital demodulated through the second receiving unit.

If the mode conversion signal is inputted to the control unit 235 through the second receiving unit 252, the control unit 235 reads current call mode state recorded inside the RAM 237. At this point, if the current call mode state is sound mode, call mode is converted to the environmentally friendly mode. On the other hand, if current call mode state is the environmentally friendly mode, mode conversion process terminates still holding the environmentally friendly mode as it is.

In the case of this embodiment, different frequency band (similar frequency band) of the control unit and mode conversion signal are received on one antenna. Accordingly, external transmitting device applying to this embodiment should be able to generate electric wave of shared frequency band of the portable wireless phone. For example, in case of cellular phone, it should be able to generate mode conversion signal of frequency band corresponding to shared frequency of Oil, 017 and in case of PCS phone, that of 016, 018, 019.

Also, in case of this embodiment, because it receives different frequency band of control signal for communication and mode conversion signal on one antenna 221, means for separating these receive signal should be embedded inside the portable communication equipment. Accordingly, in case of this embodiment , some circuit modification is inevitable inside the existing portable communication equipment.

Accordingly, in this embodiment, production cost is reduced comparing to the embodiment 1 because it ' s not needed to install another antenna receiving mode conversion signal and the installation cost can be reduced as the number of frequency band which the external transmitting device should transmit is decreased comparing to the second embodiment.

On Fig. 13 is illustrated block diagram of pager applying to this embodiment .

Also in case of pager, it has a configuration and operation identical with the portable wireless phone. Accordingly, we will omit explanation about configuration and operation of the pager based on this embodiment by substituting the portable wireless phone for it.

Also, this embodiment is different merely in the method of discriminating and recognizing the control signal for communication and the mode conversion signal, but the process of executing call mode conversion processing after the control unit recognizes mode conversion signal is identical. Accordingly, also in case of this embodiment, a communication common carrier concerned can easily device the same modified example as embodiment 1-2, 1-2, 1-3 which is the modified example of the embodiment .

Embodiment 4. This embodiment , which is a kind of modified example of the embodiment 2, shows the case that the mode conversion signal applies to the forward pilot channel of CDMA mobile phone system, (the case of being transmitted from the base station to the mobile station) . That is, the external transmitting device installed on the ceiling of anti-noise place transmits signal of frequency band identical with frequency band of forward channel transmitted from the base station of CDMA system. Particularly, it is desirable to transmit mode conversion signal on pilot channel among the forward channels. In this case, the mode conversion signal must use PN sequence offset value which other base stations never use among 512 pilot PN sequence offset value. Accordingly the portable communication terminal of this embodiment retrieves several pilot signals received on cell where it is located and then executes mode conversion processing program like Fig. 14 if pilot signal with offset value allotted for mode conversion signal is received.

The portable communication equipment of this embodiment has an internal configuration identical with Fig. 5. They are different each other only in additionally possessing mode conversion processing program (follows the flowchart of Fig. 14) recorded inside the ROM 36 and internal detect flag indicating current mode state. This detect flag is loaded in the control unit. The retrieval flag, which is used to make CPU of the control unit recognize current call mode state of the communication terminal sets "1" if current call mode state is sound mode and "0" if the environmentally friendly mode (especially, in the case of vibration mode) . Following, we explain in detail the mode conversion processing of this embodiment with reference to Fig. 14.

If a user carrying portable communication terminal of this embodiment enters anti-noise place, it receives pilot signal for mode conversion from the external transmitting device installed on the ceiling of the place.

As the pilot signal for mode conversion has PN sequence offset value (the value specially allocated only for the mode conversion among 512 pilot PN offset indexes) which the radio base station can't have, the control unit 35 of the portable communication terminal recognizes by the offset value that current pilot signal is mode conversion signal.

That is, if the control unit 35 of portable communication terminal succeeds in retrieval of mode conversion signal, the control unit 35 retrieves retrieval flag (not illustrated on drawing) and then return to step S 51, the retrieval step of mode conversion signal, if the value is "1" or if "0" or it instructs mode conversion unit 41 to convert current call mode to the environmentally friendly mode. (step S 53)

According as mode conversion control signal is inputted from control unit 35, the mode conversion unit converts current mode state to the environmentally friendly mode (vibration mode, optical mode, weak sound mode) and the control unit sets the value of internal retrieval flag to "1".( step S 54) If the control unit 35 fails m the retrieval of mode conversion signal in the step S 52, the control unit checks whether the value is "1" by retrieving the retrieval flag. At this moment, m case of "1", current the environmentally friendly mode is restored to sound mode and the retrieval flag is reset to "0". (step S 56)

As described above, the mode conversion control system of this embodiment is an example applying to CDMA system, and especially we explained the case that mode conversion signal is loaded on forward pilot channel. But it is not confined that the mode conversion signal of this embodiment is necessarily loaded on pilot channel, same function and effect can be sufficiently attained with the identical method with synchronization channel, other forward channel or call channel. Also this embodiment can doubtlessly apply to TDMA system in limitation of not disobeying the basic principal of this embodiment.

Embodiment 5

The embodiment 1 or embodiment 4 is about an invention that portable communication terminal automatically converts current call mode to the environmentally friendly mode if mode conversion signal is obtained from the external transmitting device, when it is carried into anti-noise place.

But as the embodiment 1 or embodiment 4 only mention the conversion of the call mode, it is not useful m places where extreme stillness is asked or where call is prohibited.

That is, in places where extreme stillness is asked like hospital (especially, serious sickroom, etc.), classroom, etc. or where call is prohibited like airport, it is necessary not just to convert call mode, but to prohibit the use of portable phone itself.

Also in anti-noise places, not the conversion of call mode but the use of portable phone is asked according to environment, too. Accordingly this embodiment is about the environmentally friendly communication system that enables not only the conversion call mode according to using environment but also the interruption of using portable communication terminal, which is invented for such asking. Fig. 15 shows block diagram about the environmentally friendly communication system of this embodiment.

This embodiment widely consists of external transmitting device 200 and the portable communication terminal 100 corresponding to this external transmitting device.

The external transmitting device 200 is installed in anti-noise place. It is desirable to install the external transmitting device 200 on the ceiling of anti-noise place. The external transmitting device 200 is configured to select alternatively mode conversion signal or power off signal to transmit it. At this point the mode conversion signal means the signal which converts call mode of the portable communication to the environmentally friendly mode and the power off signal means a signal which controls the driving power of portable communication terminal .

Accordingly, the external transmitting device 200 can transmit the power off signal and the mode conversion signal m alternative way by easily modifying the using state selecting switch attached on the external transmitting device 200. The portable communication terminal 100 of this embodiment is substantially identical with the configuration of the embodiment 1 or embodiment 4 as to the conversion of call mode. Merely, it has the difference as following in the algorithm of receiving power off signal.

That is, the control unit 35 of the portable communication terminal 100 of this embodiment executes power off processing program, like Fig. 16. Also inside the internal ROM 36 of portable communication terminal 100 is recorded the power off processing program like Fig. 16. The portable communication terminal additionally includes a power control unit 101 besides the mode conversion unit 41.

The power control unit 101 switches off or on the power authorized from battery 102. Accordingly, if the communication terminal 100 receives power off signal from the external transmitting device 200 m state of power control mode, the power control unit 101 switches off power supplied to communication terminal by switching off power supply from battery 102.

Following, we explain power off processing of this embodiment with reference to fig. 16.

When a user enters a place where external transmitting device 200 of this embodiment is installed, the antenna 21 of communication terminal 100 receives mode conversion signal or power off signal from the external transmitting device 200. In case of CDMA 200 system, this mode conversion signal and power off signal are transmitted on pilot channel. Accordingly, each different PN sequence offset value are allocated to the mode conversion signal and the power off signal The offset values allocated to the mode conversion signal and power off signal are specially allocated pilot signals which the base station CDMA system doesn't use.

The antenna 21 of the communication terminal synchronized to frequency of CDMA forward channel retrieves pilot channel, (step S61).

It retrieves whether mode conversion signal exists among thus retrieved pilot signals (step S 51) and then executes mode conversion processing if there is any pilot signal with offset value identical with the mode conversion signal, (step S63)

Execution of this mode conversion processing is identical with that of the embodiment 4.

If mode conversion signal is not retrieved in step S 62, it is retrieved whether power off signal exists. (step S64)

If power off signal is retrieved in the step S 64, control unit 35 executes power control processing. (step S65)

That is, the control unit 35 passes down the instruction to the power control unit 101 so that power from battery 102 might be switched off. At this moment, undoubtedly the minimum power basically necessary for communication terminal is left.

Like this, this embodiment has the merit of constructing more the environmentally friendly communication system by controlling the use of portable communication terminal as well as the converting mode with the external transmitting device installed in anti-noise place .

embodiment 6

This embodiment is about a mode conversion control system and a portable communication equipment which can be appropriately used in anti-noise places where extreme stillness is asked like hospital or where call is prohibited like airport.

The external transmitting device of this embodiment transmits signal of frequency band which a portable communication equipment doesn't use for communication with base station. That is, it transmits signal of special frequency band.

Also the external transmitting device of this embodiment transmits power off signal for switching off battery's power supply of portable communication equipment. This external transmitting device can be installed on the ceiling or at the entrance of anti-noise place . Particularly, they can transmit signals of each different or identical frequency band by being installed at the inner and the outer side of entrance of anti-noise place. According to this, this external transmitting device can discriminate the state of being carried in and out of the portable communication device corresponding to this external transmitting device.

Also, the other external transmitting device can have each different frequency band to be discriminated from the external transmitting device transmitting mode conversion signal. Even this case, the mode conversion signal and power off signal is identical in having special frequency band. Merely, the one transmits signal of different central frequency to discriminate whether the receive signal of portable communication device is mode conversion signal instructing the conversion of call mode or power off signal instructing switching off power supply.

Also, the mode conversion signal and the power off signal can be discriminated by varying the code of signal loaded on carrier wave. At this point, the code of signal can have various code in simple form of 2 antilog code according to the system of receiving signal.

That is, the external transmitting device of this embodiment can transmit mode conversion signal or power off signal according to the character of anti-noise places. Also, it can be installed each on the inner and the outer side of the entrance to discriminate the state of being in and out.

The portable communication equipment applying to this embodiment has a configuration like Fig. 17.

As illustrated on Fig. 17, this embodiment possesses the antenna device 56 for receiving power off signal and the receive unit 52.

Also, the ROM 36 of this embodiment records power off processing program as illustrated on Fig..18 as well as the mode conversion program. Accordingly, the control unit executes mode conversion program and power off processing program according to programs recorded in the ROM like Fig. 18.

Also, this embodiment includes power control unit 301 for switching off power supply from the battery 302 as well as mode conversion unit 41.

This mode conversion unit 41 switches off power supply from the battery 302 if power off control signal is authorized from the control unit 35.

Also, the control unit executes discriminating processing that discriminates whether the receive signal of special frequency band received from the antenna is power off signal mode conversion signal. It is desirable that this discriminating processing should use a frequency difference of the two signals. Merely, in case that the two signals have identical frequency, it executes discrimination of signals from the code loaded in the signal.

Whether it uses frequency difference or code difference, the control unit must be able to discriminate whether the receive signal received from the antenna is power off signal mode conversion signal. Based on the feature of the described configuration, the portable communication equipment of this embodiment executes the function and feature identical with the portable communication equipment of embodiment 1. Accordingly, we omit the explanation about the rest components by substituting it to the portable communication equipment of embodiment 1.

Following, we explain in detail the execution of mode conversion processing and power off processing of this embodiment with reference to Fig. 18. When a user carrying portable communication equipment with the configuration of Fig. 17 enters anti-noise place, the external transmitting device installed at the entrance or on the ceiling of the place transmits mode conversion signal or power off signal. In places asking call mode conversion, an external transmitting device transmitting mode conversion signal is installed, and in places where transmission and receive of electric wave is prohibited, like hospital, an external transmitting device transmitting power off signal is installed.

This external transmitting device transmits signal of special frequency band and signal of each different central frequency band so that portable communication equipment might discriminate the mode conversion signal from the power off signal. In case of transmitting identical frequency band, it transmits signal with different code to discriminate the mode conversion signal and the power off signal.

The antenna 56 of the portable communication equipment retrieves whether any signal of frequency band is received. (S 71 If the antenna of mode conversion processing unit 56 retrieves the signal of special frequency band, the control unit 35 discriminates whether this receive signal is mode conversion signal. (S 73)

That is, the control unit 35 discriminates whether the currently received signal is mode conversion signal or power off signal by retrieving the central frequency of receive signal or comparing it with the code loaded inside internal register of the control unit.

If the control unit 35 discriminates the receive signal as mode conversion signal, it executes mode conversion processing like the Fig. 6. by authorizing the mode conversion unit 41 the mode conversion signal.

That is, it retrieves current call mode and then converts it to the environmentally friendly mode if it's sound mode. In the S73, if control unit discriminates whether the receive signal is power off signal (S 75)

If the receive signal is discriminated as power off signal, the control unit 35 authorizes power off signal (control) to power control unit 301. If power off signal (control) is authorized from the control unit 35, the control unit 301 powers off the power of the portable communication equipment by switching off the power supply from battery 302.

In case of this embodiment, as the process that portable communication equipment restores to initial mode or switches on power by deciding the state of being in and out is, identical with the modified example 1, we omit the explanation .

As above, in this embodiment, we can contract more the environmentally friendly communication system by installation of the external transmitting devices transmitting the mode conversion signal of special frequency band and the power off signal and by installation of a separate antenna on the portable communication equipment for receiving this external transmitting signal in anti-noise place. Particularly, this embodiment can realize the environmentally friendly state of artificial intelligence by cutting off communication of portable communication equipment as well as by just converting call mode of portable communication equipment. In the widest meaning, portable communication equipment has unique effect of protecting neighbors from all displeasure resulting from portable communication equipment in that the environmentally friendly mode is not confined to converting sound mode to vibration mode, optical mode, weak sound mode, but also it includes power off mode

Persons with the knowledge of this field will easily recognize additional strong points and modifications. Accordingly, in wide modalities, this invention is not confined to specific detail and representative devices indicated and explained in this details. Accordingly, various modification will be possible, which is not out of appended patent claiming scope and the mind of overall invention concept defined by the equivalents .

This invention is not confined to the embodiment, so it ' s a matter of course that various corrections and modifications are possible in the equivalent scope of patent claiming and technology mind of this invention by persons with average knowledge in the fields technology of this invention, which will be mentioned following . As explained above, this invention prevents neighbors' displeasure by ringback tone because it automatically converts the call mode of every portable communication equipment carried in and out of anti-noise place .

Claims

1. A mode conversion system comprising: transmitting means for transmitting a mode conversion signal of a frequency band, which portable communication terminal can recognize, in order to convert the call mode of a portable communication terminal to a mode according to the environment in which it is being used; and a portable communication device for receiving the mode conversion signal transmitted from the transmitting means, and automatically converting a current call mode thereof to an environmentally friendly mode according to the environment, in which it is being used.

2. The mode conversion system in accordance with claim 1, wherein the transmitting means generates electric waves of a special frequency band not used for communication, and the portable communication device possesses separate receiving means for receiving the signal of the special frequency band.

3. The mode conversion system in accordance with claim 2, wherein the portable communication device comprises : a first antenna for transmitting and receiving control signal and aural signal according to allotted frequency; a second antenna for receiving the mode conversion signal of the special frequency band for converting the call mode; mode conversion means for discriminating the current call mode if the mode conversion signal is inputted from the second antenna, and then converting it to the environmentally friendly mode if it is in a sound mode state .

. The mode conversion system in accordance with claim 3, wherein the environmentally friendly mode is selected among vibration mode, optical mode, weak sound mode .

5. The mode conversion system in accordance with claim 1, wherein the transmitting means transmits mode conversion signal of frequency band identical with receive signal for communication of portable communication terminal .

6. The mode conversion system in accordance with claim 5, wherein the mode conversion signal applies frequency band identical with CDMA forward channel.

7. The mode conversion system in accordance with claim 6, wherein the mode conversion signal is transmitted on pilot channel and has PN sequence offset value specially allotted ONLY for mode conversion which other radio base stations don't use.

8. The mode conversion system in accordance with claim 7, wherein the portable communication device comprises : receiving means that receives the mode conversion signal transmitted from transmitting means and the forward signal transmitted from base station; means that stores the PN sequence offset value for the mode conversion; and mode conversion means that discriminates whether the offset value from the receiving means accords with offset value for mode conversion stored in the storing means and then converts current call mode to the environmentally friendly mode if it accords.

9. The mode conversion system in accordance with claim 1, wherein the transmitting means transmits mode conversion signal of shared frequency band similar to receive frequency for communication of the portable communication terminal.

10. The mode conversion system in accordance with claim 9, wherein the portable communication device comprises : receiving means that receives the forward signal transmitted from base station and the mode conversion signal transmitted from transmitting means. signal filtering means that extracts mode conversion signal among receive signal received on the receiving means by using the frequency difference; and mode converting means which converts current call mode to the environmentally friendly mode if mode conversion signal extracted by the filtering means is inputted.

11. A mode conversion control system comprising: transmitting means that transmits either mode conversion signal for transmitting call mode of portable communication device to the environmentally friendly mode or power off signal for switching off power of portable communication device; and a portable communication device which converts current call mode to the environmentally friendly mode if it receives the mode conversion signal from the transmitting means and then powers down the power of terminal by switching off the power supply from battery if it receives power off signal.

12. The mode conversion control system in accordance with claim 11, wherein the transmitting means generates electric wave of special frequency band not used for communication and that the portable communication device possesses a separate receiving means for receiving the signal of the frequency band.

13. The mode conversion control system in accordance with claim 12, wherein the portable communication device includes a first antenna for receiving and transmitting control signals and aural signal with radio base station according to the allocated frequency; the second antenna for receiving mode conversion signal and power off signal of special frequency band; discriminating means for deciding whether the received receive signal from the second antenna is mode conversion signal instructing conversion of call mode or power off signal for switching off power supply; mode conversion means which, if the discriminating means recognizes the receive signal as mode conversion signal, discriminates current call mode and then automatically converts it to vibration mode if it is sound mode; and power control means which powers down the power of the terminal by switching off power supply supplied from battery if the discriminating means recognizes the receive signal is mode conversion signal.

14. The mode conversion control system in accordance with claim 13, wherein the discriminating means discriminates receive signal by using difference of central frequency.

15. The mode conversion control system in accordance with claim 13, wherein the discriminating means includes internal memory terminal which stores the code representing the mode conversion signal and the power off signal, and discriminates the receive signal by using the difference of code recorded in the internal memory terminal.

16. The mode conversion control system in accordance with claim 11, wherein the transmitting means transmits mode conversion signal and power off signal of frequency band identical with the receive signal for communication of portable communication terminal.

17. The mode conversion control system in accordance with claim 16, wherein the mode conversion signal and power off signal applies frequency band identical with CDMA forward channel.

18. The mode conversion control system in accordance with claim 17, wherein the mode conversion signal and power off signal are transmitted on pilot channel, have PN sequence offset value specially allocated only for external transmission which other radio base stations don't use and that the offset values are different each other in positive signal.

19. The mode conversion control system in accordance with claim 18, wherein the portable terminal device comprises : receiving means for receiving the receive signal for communication from the base station mode and the conversion signal and the power off signal from the transmitting means; discriminating means for discriminating each signal for communication, mode conversion signal and power off signal received from the receiving means; mode conversion means which converts current call mode to the environmentally friendly mode if mode conversion signal is retrieved from the discriminating means; and power control means for controlling communication of portable communication device by switching off power supply from battery if power off signal is retrieved from the discriminating frequency band.

20. The mode conversion control system m accordance with claim 11, wherein the transmitting means include switching means for converting alternatively transmitting mode of mode conversion signal or that of power off signal .

21. A portable communication device having a sound mode, an environmentally friendly mode (a vibration mode, a weak sound mode, and an optical mode) as a call mode, comprising : receiving means for receiving mode conversion signal that converts call mode of portable communication device to the environmentally friendly mode suitable for using environment from the external transmitting device installed at the anti-noise place; and mode conversion means which detects currents call mode state if mode conversion signal is inputted from the receiving frequency band and then converts it to the environmentally friendly mode if current call mode is sound mode or execution examples as it is if the environmentally friendly mode.

22. The portable communication device in accordance with claim 21, wherein the mode conversion signal applies frequency band identical with control signal for communication transmitted from base station and the receiving means is an antenna device which can receive simultaneously both control signal for communication and mode conversion signal.

23. The portable communication device in accordance with claim 22, wherein the mode conversion means comprises : a first storage means for storing mode conversion code; a second storage means for storing current call mode state; control means which reads current call mode stored in the second storage means if the receive signal received from the antenna device accords with mode conversion code stored in the second storage means band and then converts it to the environmentally friendly mode if the decoded call mode is sound mode.

24. The portable communication device in accordance with claim 23, wherein the mode conversion code is offset value specially allotted only for mode conversion which other base stations don't use among 512 PN sequence offset values allotted on CDMA pilot channel.

25. The portable communication device in accordance with claim 21, wherein the mode conversion signal has frequency band similar to the receive frequency of control signal for communication transmitted from the radio station; and the receiving means comprises separate antenna means that can receive mode conversion signal of these special frequency band simultaneously and switching means that separates the receive means into control signal for communication and mode conversion signal by using the frequency difference.

26. The portable communication device in accordance with claim 21, wherein the mode conversion signal is the signal of special frequency band (low frequency, super high frequency) , and the receiving means is an separate antenna which can receive the mode conversion signal of the special frequency band.

27. The portable communication device in accordance with claim 25 or 26, wherein the mode converting means comprises : mode conversion frequency band storing means for storing the current call mode; and controlling means that detects current call mode if mode conversion signal is inputted from the receiving means and then converts the call mode to the environmentally friendly mode if the current call mode is sound mode.

28. A portable communication device having a sound mode and an environmentally friendly mode as a call mode, comprising: receiving means that receives mode conversion signal for converting the call mode of portable communication terminal to the environmentally friendly mode from external transmitting device installed in the anti-noise place; and mode conversion means which converts current call mode to the environmentally friendly mode when entering or to call mode before entering when getting out based on the mode conversion signal.

29. The portable communication device in accordance with claim 28, wherein the mode conversion signal has the frequency band identical with control signals for communication transmitted from the radio base station and the receiving means is an antenna device which can simultaneously receive both control signal for communication and mode conversion signal.

30. The portable communication device in accordance with claim 29, wherein the mode conversion means comprises : discriminating means for discriminating whether the receive signal received from the antenna is control signal for communication or mode conversion signal; storing means that stores data for indicating current call mode; and controlling means which, if the discriminating means discriminates the receive signal from the antenna device as mode conversion signal, reads currents call mode stored in the storing means and then converts it to the environmentally friendly mode in case of sound mode or converts it to initial call mode if the receive signal discriminated as mode conversion signal is not received for some time from the antenna device and if current call mode is the environmentally friendly mode.

31. The portable communication device in accordance with claim 30, wherein the discriminating means discriminates pilot signal having specially allotted offset value specially allotted only for mode conversion not used in other base station among 512 PN sequence offset values as mode conversion signal.

32. The portable communication device in accordance with claim 28, wherein the mode conversion signal has frequency band similar to control signal for communication transmitted from the radio base station, and the receiving means comprises an antenna device which can simultaneously receive both control signal for communication and mode conversion signal and a switching device which separates the receive signal into control signal for communication and mode conversion signal by using the difference of the frequency.

33. The portable communication device in accordance with claim 28, wherein the mode conversion signal is the signal of special frequency band (low frequency, super high frequency) and the receiving means is a separate antenna device which can receive mode conversion signal of the special frequency band.

34. The portable communication device in accordance with claim 33, wherein the mode conversion means comprises : storing data for indicating current call mode; and controlling means which, if mode conversion signal is received from the antenna device for mode conversion, reads current call mode state stored in the storing means and then converts the current call mode to the environmentally friendly mode if sound mode, or converts it to initial call mode state if mode conversion signal is not received for some time from the antenna device for mode conversion and current call mode state is the environmentally friendly mode.

35. The portable communication device in accordance with claim 32 or 33, wherein the external transmitting device is installed on the top of entrance; and the mode conversion means comprises: storing means for storing current call mode, means call mode and the number of times receiving mode conversion signal; and controlling means that discriminates the state of being in and out by reading the number of times receiving mode conversion signal stored in the storing means and then converts the current call mode state to the environmentally friendly mode when entering or converts the environmentally friendly mode to former call mode state when getting out.

36. The portable communication device in accordance with claim 25, wherein the controlling means decides as being in if the number of times receiving the recorded mode conversion signal is even or as being out if odd.

37. The portable communication device in accordance with claim 33, wherein the external transmitting device transmits signals of each different frequency band toward the inner and the outer side of entrance; and the mode conversion means comprises: discriminating means that retrieves the frequency band of the signal received from the antenna device for special frequency band; and controlling means which converts current call mode state to the environmentally friendly mode if the discriminating means decides as the state of being in or converts the environmentally friendly mode to former call mode if it decides as the state of being out.

38. The portable communication device in accordance with claim 33, wherein the external transmitting devices are installed on inner and outer side of entrance; and each of the external transmitting devices comprises: discriminating means which retrieves the code of signal received from the antenna device for special frequency band and then decides the state of being in or out; and controlling means which, if the discriminating means decides as state of being in, converts current call mode to tne environmentally friendly mo╬▒e or converts the environmentally friendly mode to former call mode if it decides as the state of Demg out.

39. A portable communication device having a sound mode and an environmentally friendly mode as a call mode, comprising : receiving means that receives mode conversion signal for converting call mode to the environmentally friendly mode from the external transmitting device and power off signal for powering down the power of terminal by switching off power supply from battery; discriminating means for distinguishing the mode conversion signal from power off signal received from the receiving means; and controlling means for controlling the communication of portable communication terminal by converting current call mode to the environmentally friendly mode if tne discriminating means decides power off signal or by s itcmng off power supply from battery if the discriminating means decides as power off signal.

40. The portable communication device in accordance with claim 39, wherein the mode conversion signal and power off signal are the signal of special frequency band which portable communication device don't use and that the receiving means is a separate antenna device which can receive the mode conversion signal and power off signal of the special frequency band, and the mode conversion signal and power off signal apply each different central frequency, and the discriminating means identifies mode conversion signal and power off signal by using the difference of frequency.

41. The portable communication device in accordance with claim 39, wherein the mode conversion signal and power off signal are signals of special frequency band which portable communication device don't use and that the receiving means is a separate antenna device which can receive mode conversion signal and power off signal of the special frequency band; the mode conversion signal and power off signal are signals of identical frequency band having each different code; and the discriminating means comprises a memory terminal for storing codes representing mode conversion signal and power off signal, and discriminates receive signal by using difference of code recorded in the internal memory terminal .