WO2001093541A2 - Method and system for '911' signal detection and re-generation - Google Patents

Method and system for '911' signal detection and re-generation Download PDF

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Publication number
WO2001093541A2
WO2001093541A2 PCT/US2001/017335 US0117335W WO0193541A2 WO 2001093541 A2 WO2001093541 A2 WO 2001093541A2 US 0117335 W US0117335 W US 0117335W WO 0193541 A2 WO0193541 A2 WO 0193541A2
Authority
WO
WIPO (PCT)
Prior art keywords
telephone
extension
extension unit
line
detection
Prior art date
Application number
PCT/US2001/017335
Other languages
French (fr)
Other versions
WO2001093541A3 (en
Inventor
David Bartholomew
Scott R. Bullock
Alan Stettler
Original Assignee
Phonex Broadband Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Phonex Broadband Corporation filed Critical Phonex Broadband Corporation
Priority to AU2001265123A priority Critical patent/AU2001265123A1/en
Publication of WO2001093541A2 publication Critical patent/WO2001093541A2/en
Publication of WO2001093541A3 publication Critical patent/WO2001093541A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements
    • H04M1/715—Substation extension arrangements using two or more extensions per line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2207/00—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
    • H04M2207/18—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2242/00—Special services or facilities
    • H04M2242/04—Special services or facilities for emergency applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections

Definitions

  • This invention relates wireless telephone communication systems. More particularly, this invention relates to a telephone device that detects the off-hook condition of a telephone extension and signals the extension unit to lower its loop current thereby permitting the placement of automatic telephone calls.
  • Description of the Related Art A variety of wireless telephone extension systems are in use and/or have been proposed. However, typically these systems do not provide the capability of detecting another extension going off hook and providing the means for signaling the extension unit to reset the Customer Phone Equipment (CPE) in order to permit emergency use of the phone line.
  • CPE Customer Phone Equipment
  • U.S. Patent No. 3,564,143 describes a system that provides the means for detecting whether or not a telephone is “on hook” or “off hook”. This system also includes the means for removing an auxiliary apparatus from the line when the telephone is "off hook.”
  • U.S. Patent No. 3,786,198 describes a telephone bridging apparatus, which can be utilized with telephone switchboards and which comprises in part an audio alert as well as a visual alert to help monitor a call.
  • U.S. Patent No. 4,142,075 describes an interface circuit and method of operation for transmitting and receiving information between a telephone set and a four wire switching system.
  • U.S. Patent No. 4,567,322 describes a control means for a facsimile apparatus that has a plurality of functions by detecting the states of a plurality of elements mounted on the facsimile apparatus.
  • U.S. Patent No. 5,347,575 describes a circuit for indicating the status of a telephone line at the CPE end, where the status is either on-hook, ringing, or off-hook.
  • U.S. Patent No. 5,349,662 describes a method and apparatus for providing the automatic detection of a user in a data processing system.
  • U.S. Patent No. 5,422,939 describes a parallel off-hook detection system for both line-available and phone pick-up detection.
  • U.S. Patent No. 5,649,002 describes a method and apparatus for verifying that a Customer Premises Equipment Alerting Signal (CAS) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid signal.
  • CAS Customer Premises Equipment Alerting Signal
  • U.S. Patent No. 5,689,242 describes a tag associated with a device that identifies the device with respect to other devices that are connected to a communication link with the same connector used to connect the device to a source of power.
  • U.S. Patent No. 5,745,559 describes a logical network that is defined by a plurality of restricted class telephones in which such telephones incorporate a network access code characterizing the logical network.
  • U.S. Patent No. 5,748,706 describes an emergency signal display activation system, which responds to dialing of a predetermined emergency telephone number, such as 911.
  • U.S. Patent No. 5,815,569 describes a line interface circuit (LIC) that can detect a change in the state of Customer Premises Equipment (CPE), including if the CPE is off-hook.
  • LIC line interface circuit
  • U.S. Patent No. 5,835,581 describes a multi-function telephone dialer display device, which is equipped with a display screen for displaying the use states and caller identification information.
  • U.S. Patent No. 5,844,977 describes an apparatus for detecting customer premise equipment alerting signals in a first telephone having a transmit circuit and a receive circuit and a hybrid line termination for connecting the transmit circuit and the receive circuit to a central office line.
  • U.S. Patent No. 5,850,436 describes a method and apparatus that provides communication in a telephone system connected to an external phone line, wherein the telephone system has a telephone line, a telephone, a phone interface unit coupled to the telephone and the telephone line, a computer system, and a computer interface unit coupled to the computer system and the telephone line.
  • U.S. Patent No. 5,864,607 describes a telephone system having a telephone network line for connection to an external phone line.
  • a "911" condition occurs when the telephone line is in use and a second extension goes off hook, thereby creating a drop in the line current.
  • a further object of this invention is to provide a method and system, which can detect if an extension unit is picked up.
  • a still further object of this invention is to provide a method and system, which can signal, to an extension unit to emulate a drop in loop current.
  • Another object of this invention is to provide a method and system, which causes the extension unit to appropriately drop its current.
  • Figure 1 is a top-level block diagram of the preferred embodiment of the system of this invention.
  • FIG. 2 is a flow chart showing preferred steps of the method of this invention. Detailed Description of the Invention
  • This invention is a method and system for "91 l"-call detection and enablement in a wireless telephone system, which has a base unit connected to the telephone line and an extension unit.
  • the base unit and the extension unit are in wireless communication with each other.
  • This invention determines if an extension unit telephone has been brought off-hook mid call. When such an event occurs the loop current in the base unit is detected and a signal is sent to the extension unit in use to lower its loop current, thereby freeing up the line for use by another extension in a "911" emergency call or the like.
  • Figure 1 shows a top-level block diagram of the preferred embodiment of the system of this invention.
  • a base unit 101 is provided having a standard telephone plug 102, typically and preferably an RJ-11 connector, for connection to a standard telephone line.
  • the telephone plug 102 provides an electrical tip and ring connection 103a,b to a current sensing circuit 104.
  • the current sensing circuit 104 is electrically connected to the wireless communication channel 106/107.
  • This wireless communication channel can be an RF over-the-air channel or an AC power line channel or the equivalent.
  • An extension unit 112 is in communication 107/106 with the base unit 101.
  • the extension unit 112 has a loop current lowering circuit 109 in communication with a telephone plug 111, typically and preferably an RJ- 11 plug, which typically will be connected to the user's telephone communication equipment.
  • this invention works based on the premise that a device which connects to a wireless telephone line and which makes automatic telephone calls uses the telephone line tip and ring voltage to determine when another customer telephone device seizes the line.
  • This invention detects the loop current in the base unit 101, which then sends a signal to the extension unit 112 to lower its current through the tip and ring when it detects a drop in current.
  • the base unit 101 detects the current using a voltage comparator or, alternatively an operational amplifier associated with a sense resistor. Discrete transistor components or analog to digital conversion techniques could also be employed.
  • the extension unit 112 generates the detected current using its own power supply along with current conversion or switching techniques.
  • this invention uses FSK modulation techniques for the modulation of the carrier from the base 101 to signal to the extension unit 112.
  • a micro controller in the base unit 101 encodes a data message for this purpose and a micro controller in the extension unit 112 decodes the data message and performs the appropriate operation, in this case makes the various currents available in the extension unit 112.
  • Figure 2 is a flow chart showing alternative preferred steps of the method, used in an extension pickup detect during off -hook condition, of this invention.
  • the method starts 201.
  • a loop current drop detection 202 step is performed.
  • the extension unit is sent 203 the message to drop its loop current.
  • the extension unit drops 204 its loop current and the process ends 205.

Abstract

A method and system for providing the means of detecting and re-generating '911' signals in a wireless telephone/data jack is described. This invention provides signaling (106, 107) between a base unit (101) and an extension unit (112) that communicates an extension pick-up detection. The base unit (101) detects a drop in current and sends a signal to the extension unit (112) to drop the current in the extension unit (112). The loop current (109) is checked to determine if the extension unit is off-hook. This invention employs FSK signally of the carrier to communicate an encoded signaling between the base unit and the extension unit.

Description

METHOD AND SYSTEM FOR "911" SIGNAL DETECTION AND RE-GENERATION
Background of the Invention Field of the Invention. This invention relates wireless telephone communication systems. More particularly, this invention relates to a telephone device that detects the off-hook condition of a telephone extension and signals the extension unit to lower its loop current thereby permitting the placement of automatic telephone calls. Description of the Related Art. A variety of wireless telephone extension systems are in use and/or have been proposed. However, typically these systems do not provide the capability of detecting another extension going off hook and providing the means for signaling the extension unit to reset the Customer Phone Equipment (CPE) in order to permit emergency use of the phone line.
For general background material the reader is directed to the following U.S. patents each of which is incorporated in its entirety for the material contained therein. U.S. Patent No. 3,564,143 describes a system that provides the means for detecting whether or not a telephone is "on hook" or "off hook". This system also includes the means for removing an auxiliary apparatus from the line when the telephone is "off hook." U.S. Patent No. 3,786,198 describes a telephone bridging apparatus, which can be utilized with telephone switchboards and which comprises in part an audio alert as well as a visual alert to help monitor a call. U.S. Patent No. 4,142,075 describes an interface circuit and method of operation for transmitting and receiving information between a telephone set and a four wire switching system.
U.S. Patent No. 4,567,322 describes a control means for a facsimile apparatus that has a plurality of functions by detecting the states of a plurality of elements mounted on the facsimile apparatus.
U.S. Patent No. 5,347,575 describes a circuit for indicating the status of a telephone line at the CPE end, where the status is either on-hook, ringing, or off-hook.
U.S. Patent No. 5,349,662 describes a method and apparatus for providing the automatic detection of a user in a data processing system.
U.S. Patent No. 5,422,939 describes a parallel off-hook detection system for both line-available and phone pick-up detection.
U.S. Patent No. 5,649,002 describes a method and apparatus for verifying that a Customer Premises Equipment Alerting Signal (CAS) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid signal.
U.S. Patent No. 5,689,242 describes a tag associated with a device that identifies the device with respect to other devices that are connected to a communication link with the same connector used to connect the device to a source of power. U.S. Patent No. 5,745,559 describes a logical network that is defined by a plurality of restricted class telephones in which such telephones incorporate a network access code characterizing the logical network. U.S. Patent No. 5,748,706 describes an emergency signal display activation system, which responds to dialing of a predetermined emergency telephone number, such as 911.
U.S. Patent No. 5,815,569 describes a line interface circuit (LIC) that can detect a change in the state of Customer Premises Equipment (CPE), including if the CPE is off-hook.
U.S. Patent No. 5,835,581 describes a multi-function telephone dialer display device, which is equipped with a display screen for displaying the use states and caller identification information. U.S. Patent No. 5,844,977 describes an apparatus for detecting customer premise equipment alerting signals in a first telephone having a transmit circuit and a receive circuit and a hybrid line termination for connecting the transmit circuit and the receive circuit to a central office line.
U.S. Patent No. 5,850,436 describes a method and apparatus that provides communication in a telephone system connected to an external phone line, wherein the telephone system has a telephone line, a telephone, a phone interface unit coupled to the telephone and the telephone line, a computer system, and a computer interface unit coupled to the computer system and the telephone line.
U.S. Patent No. 5,864,607 describes a telephone system having a telephone network line for connection to an external phone line.
Summary of the Invention It is desirable to provide a method and system for the detection and regeneration of "911" signals in a wireless telephone extension system. A "911" condition occurs when the telephone line is in use and a second extension goes off hook, thereby creating a drop in the line current. In particular, it is desirable to provide a method and system which can detect if a hard wired extension phone goes off hook and, if detected, can signal to the wireless telephone extension unit to lower its loop current signaling the device connected to the extension to disconnect, thereby permitting the use of the telephone line for emergency calls.
Therefore it is the general object of this invention to provide a method and system for providing "911" detection in a base unit of a wireless telephone system.
It is a further object of this invention to provide a method and system for providing the capability of "911"-signal generation in an extension unit of a wireless telephone system.
A further object of this invention is to provide a method and system, which can detect if an extension unit is picked up.
A still further object of this invention is to provide a method and system, which can signal, to an extension unit to emulate a drop in loop current.
Another object of this invention is to provide a method and system, which causes the extension unit to appropriately drop its current.
It is an object of this invention to provide a method and system of "911" detection, which is fully compatible with AC power line communication systems. Another object of this invention, in an alternative embodiment, is to provide a method and system of "911" detection, which is fully compatible with a "through the air" RF system. These and other objects of this invention will be readily apparent to those of ordinary skill in the art upon careful review of the following drawings, detailed description, claims and abstract.
Brief Description of Drawings In order to show the manner that the above recited and other advantages and objects of the invention are obtained, a more particular description of the preferred embodiment of the invention, which is illustrated in the appended drawings, is described as follows. The reader should understand that the drawings depict only a preferred embodiment of the invention, and are not to be considered as limiting in scope. A brief description of the drawings is a follows:
Figure 1 is a top-level block diagram of the preferred embodiment of the system of this invention.
Figure 2 is a flow chart showing preferred steps of the method of this invention. Detailed Description of the Invention
This invention is a method and system for "91 l"-call detection and enablement in a wireless telephone system, which has a base unit connected to the telephone line and an extension unit. The base unit and the extension unit are in wireless communication with each other. This invention determines if an extension unit telephone has been brought off-hook mid call. When such an event occurs the loop current in the base unit is detected and a signal is sent to the extension unit in use to lower its loop current, thereby freeing up the line for use by another extension in a "911" emergency call or the like. Figure 1 shows a top-level block diagram of the preferred embodiment of the system of this invention. A base unit 101 is provided having a standard telephone plug 102, typically and preferably an RJ-11 connector, for connection to a standard telephone line. The telephone plug 102 provides an electrical tip and ring connection 103a,b to a current sensing circuit 104. The current sensing circuit 104 is electrically connected to the wireless communication channel 106/107. This wireless communication channel can be an RF over-the-air channel or an AC power line channel or the equivalent. An extension unit 112 is in communication 107/106 with the base unit 101. The extension unit 112 has a loop current lowering circuit 109 in communication with a telephone plug 111, typically and preferably an RJ- 11 plug, which typically will be connected to the user's telephone communication equipment. Generally this invention works based on the premise that a device which connects to a wireless telephone line and which makes automatic telephone calls uses the telephone line tip and ring voltage to determine when another customer telephone device seizes the line. This invention detects the loop current in the base unit 101, which then sends a signal to the extension unit 112 to lower its current through the tip and ring when it detects a drop in current. Preferably, the base unit 101 detects the current using a voltage comparator or, alternatively an operational amplifier associated with a sense resistor. Discrete transistor components or analog to digital conversion techniques could also be employed. The extension unit 112 generates the detected current using its own power supply along with current conversion or switching techniques. In its preferred embodiment, this invention uses FSK modulation techniques for the modulation of the carrier from the base 101 to signal to the extension unit 112. A micro controller in the base unit 101 encodes a data message for this purpose and a micro controller in the extension unit 112 decodes the data message and performs the appropriate operation, in this case makes the various currents available in the extension unit 112. Figure 2 is a flow chart showing alternative preferred steps of the method, used in an extension pickup detect during off -hook condition, of this invention. In this embodiment, the method starts 201. A loop current drop detection 202 step is performed. Next, the extension unit is sent 203 the message to drop its loop current. The extension unit drops 204 its loop current and the process ends 205. The described embodiment are to be considered in all respects only as illustrative and not as restrictive. Although the embodiment shown here use particular components and steps the invention is not limited thereto. The scope of this invention is indicated by the appended claims rather than by the foregoing description, which is provided to describe the best mode of the invention envisioned by the inventors. All changes that come within the meaning and range of equivalency of the claims are to be embraced as being within their scope.

Claims

ClaimsWe claim:
1. A system for the detection and re-generation of line availability in a wireless telephone communication system, comprising: (A) a base unit, comprising:
(1) telephone line connection;
(2) a current sensing circuit; and
(3) a base wireless communication channel connection;
(B) an extension unit, comprising: (1) a telephone device connection;
(2) a loop current lowering circuit; and
(3) an extension wireless communication channel connection; and
(C) a wireless communication channel.
2. A system for the detection and re-generation of line availability in a wireless telephone communication system, as recited in claim 1, wherein said wireless communication channel is an AC power line communication channel.
3. A system for the detection and re-generation of line availability in a wireless telephone communication system, as recited in claim 1, wherein said wireless communication channel is an RF over-the-air communication channel.
4. A method for the detection and re-generation of "911" signaling in a wireless telephone communication system, comprising:
(A) detecting a drop in loop current;
(B) sending a message to an extension unit; and (C) dropping said loop current of said extension unit.
PCT/US2001/017335 2000-05-30 2001-05-29 Method and system for '911' signal detection and re-generation WO2001093541A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001265123A AU2001265123A1 (en) 2000-05-30 2001-05-29 Method and system for "911" signal detection and re-generation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58489900A 2000-05-30 2000-05-30
US09/584,899 2000-05-30

Publications (2)

Publication Number Publication Date
WO2001093541A2 true WO2001093541A2 (en) 2001-12-06
WO2001093541A3 WO2001093541A3 (en) 2002-04-11

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WO (1) WO2001093541A2 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558177A (en) * 1983-10-03 1985-12-10 Cellutron Corporation Regulated output current source for cordless telephones
US4737975A (en) * 1984-09-18 1988-04-12 Metrofone, Inc. Programmable system for interfacing a standard telephone set with a radio transceiver
US4922517A (en) * 1987-04-08 1990-05-01 Metrofone, Inc. System for interfacing a standard telephone set with a radio transceiver
US4993058A (en) * 1989-10-02 1991-02-12 Mcminn Edward W Phone activated emergency signaling system
US5483579A (en) * 1993-02-25 1996-01-09 Digital Acoustics, Inc. Voice recognition dialing system
US5953400A (en) * 1996-07-18 1999-09-14 At&T Corp. Communication system for a closed-user group

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558177A (en) * 1983-10-03 1985-12-10 Cellutron Corporation Regulated output current source for cordless telephones
US4737975A (en) * 1984-09-18 1988-04-12 Metrofone, Inc. Programmable system for interfacing a standard telephone set with a radio transceiver
US4922517A (en) * 1987-04-08 1990-05-01 Metrofone, Inc. System for interfacing a standard telephone set with a radio transceiver
US4993058A (en) * 1989-10-02 1991-02-12 Mcminn Edward W Phone activated emergency signaling system
US5483579A (en) * 1993-02-25 1996-01-09 Digital Acoustics, Inc. Voice recognition dialing system
US5953400A (en) * 1996-07-18 1999-09-14 At&T Corp. Communication system for a closed-user group

Also Published As

Publication number Publication date
WO2001093541A3 (en) 2002-04-11
AU2001265123A1 (en) 2001-12-11

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