CA1179735A - Encoder for transmitted message activation code - Google Patents

Abstract

Abstract The encoder which preferably produces a transmitted digital word which serves as an activation code for a single receiver or a group of receivers. The activation code effects only the receiver(s) that have previously detected their digital address and are therefore prepared to enter a message receive state. The activation code transmitted by the encoder will cue the receiver(s) simultaneously thereby allowing the encoder to send a single message to a plurality of receivers. The activation code also allows the encoder to interleave messages to receivers by utilizing the customary transmitter down time in a single message transmission. During this down time, the activation code allows the transmitter to begin transmission of a second message to a second receiver. The use of the activation code to interleave messages is especially important in tone and voice transmissions since it significantly increases the efficiency of a heavily loaded system.

Description

~-~ '7'~'7~5 Backqround of ~he Invention Prior art message systems general function upon the detection of coded signals which are predesi~nated to correspond to an address of an individual receiver. Some prior art digital coding systems operate by having a plurality of receivers asynchronously come on a timed basis to look for the presence of a digital word to determine if they should remain on for the detection of a possible message. This constitutes a form of battery saving to the receiver population.
A limitation of such prior art systems is that there is not a convenient method of arranging group call at the transrnitter site or paging terminal so that an arbitrary plurality of pagers may be activated simultaneously. A further limitation with the prior art occurs for tone and voice systems in which the paging receiver provides an alert time after which a voice message may be detected. Each time an individual paginq receiver is paged with a voice message the alert time interval during which the pager user is warned so that he may respond to the subsequent audio message is lost to the system since no other information can be transmitted during that interval. If for example, another tone and voice pager were addressed during the alert time for the first addressed tone and voice pager at the conclusion of the second addressed tone and voice paqers alert time its audio channel would be enabled to catch a substantial portion of the voice message for the first addressed tone ~- and voice pager thereby possibly confusing the pager - users with respect to the messages they receive.
One aspect of the present invention includes the positioning of an activation code signal within a broadcast message system such that all receivers which have been correctly addressed remain in a ready state until the detection of an activate code sianal which -.~

~ 2 --~ 7~ ~

then causes simultaneous activation of the operational routine. Although the specific invention is embodied within a digital paging system it is clear to those skilled in the art that it may have many other uses and formats. Morever the use of such of an activation control signal enables the interleaving of messages within a message alert time especially for a tone and voice pager which has been addressed and ensures that the second addressed tone and voice pager will not activate until it receives an activation code signal subsequent to its address. Thus there is no chance that the second address tone and voice pager could come on during the time period in which the first pager was receiving its variable length voice message. Another advantage of such a system is that it further allows interleaving of various types of messages including tone only, data and tone and voice into one signalling system thereby substantially enhancing the flexibility of the transmitted message system.

SU~1~1ARY OF THE INVENTION

It is an object of the present invention to provide an improved encoder for transmitted coded messages.
It is a further object of this invention to pro-vide an encoder which can designate the activation ti~e of addressed receivers.

An encoding device for generating sequential code signals containing information which is to be transmitted by means of electromagnetic radiation to selected receivers in a plural population of re-ceivers comprises means for generating coded sig-nals to address at least one receiver, in the plural population and means for generating activation code signals subsequent to the address si~nals to cause at least one addressed receiver to response to the information transmitted.

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Brief Description of the Drawings Figure 1 A-G are timing diagrams for the encoded messaqe system for the present invention.
Figure 2 is a functional block diagram of a hardware embodiment of the present invention.
Figure 3 is a state diagram representing the functions for the diagram of Figure 2.
Figure 4 is an functional block diagram of the firmware embodiment of the present invention.
Figure 5 is an electrical schematic of a portion of Figure 4.
Figure 6 is a flowchart for the firmware embodiment of the present invention.

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Description of the Preferred Embodiment Figure 1A shows a timing diagram the use of the activation code signal in connection with addressing a receiver. Normally receivers detect their address and immediately responc by whatever function correspondes to the predetermined address which has been detected. While this is common in the prior art, it is distinctly advantageous to provide an additional activation code signal which controls the time at which the receiver will respond to the detection of its address. Thus the inclusion of the activation control sianal allows the transmitter to determine precisly when any adressed receiver ~1ill become active.
As may be more clearly seen by referring to Figure lB receiver may be grouped by including a series of addresses in sequential fashion followed by an activation code signal at the conclusion of whatever arbritary number of addresses may be chosen to form a batch. The advantage is that upon reception of the activation code all members of the arbitrarily designated batch of recievers will all respond simultaneously. Thus it may be seen that the terminal operater at the transmitter site can create an arbitrary grouping of receivers and cause their subseguent simmultaneouse activation. This can be an distinct advantage not only in message systems but in simultaneously controlling a plurality operations at some remote site.
While it is clear that many types and formats of signal coding may be utilized for the present invention the preferred embodiment utilizes a diqital siqnal system designated as the Golay Sequential code. The Golay Sequential Code (GSC) is a selective call paginq protocol based largely on the current Golay binary paging format.
A full description of the Golay code may be found in a paper entitled "Selective Signalling for Portahle 1~ 7~)735 Applications" by Leonard E. Nelson, 28th IEEE Vehicular Technology Conference, Denver, Colorado, March 22-24, 1978. The Golay ~equential Code is NRZ binary signalina format that has been greatly modified from an eariler format to accommodate intermixed tone only, tone and data, as well as tone and voice paging and now improved battery savinq.
The GSC is an asynchronous paging format allows pages to be transmitted individually or in batches.
Maximum message thouqhput for tone only and tone and data pages is achieved in the batch transmission mode; while the individual call mode is useful in tone and voice paqing.
The single call address format consists of a preamble, a control word, an address code, and for voice paging, an Activation Code (AC). The preamble serves to divide pagers within the system into groups for improved battery life, as well as to uniquely identify GSC
transmissions from other coding schemes to faciliate channel sharing without sacrificing battery life or false call integrity. The control word delimits the end of the preamble and it supplies timing information for the batch mode decoding. The address uniquely identifies each pager and the AC is used to control the paaer a~dio circuits in voice paging. The batch mode of operation allows a strin~ of addresses to be transmitted following the control word.
A data message consists of an address followed by one or more data blocks. Data messages may be transmitted individually in the single call mode or intermixed with address only pages in the batch mode of transmission. Address and data blocks are exactly the same length. The address information is constructed from words selected from the ~olay (23, 12) cyclic code while the data information is encoded using the (15, 7) ~CH
code. Address information is transmitted at 300 '7~1~
bits/second while data information is transmitted at 600 bits/second.
In addition to enabling pagers to operate in a battery saver mode, the polarity of the preamble identifies the transmission mode single call or batch.
For instance, when the prearnble words are transmitted with one predetermined bit polarity, the single call mode is identified; if the preamble bits are inverted, the batch mode is indicated.
The control word activation code and address code all use a two word format consisting of 28 bits of comma followed bv two (23, 12) code words. The comma is a 1, 0 bit reversal pattern transmitted at 600 bits/second. The two Golay code words (Word 1 and Word 2) are separated by a 1/2 bit space. The polarity of the 1/2 bit space shall be opposite the first bit of the second word and the starting comma bit must be of the same polarity as the first bit of the first word. The control word and activation code are predetermined for the preferred system. IWord 2 of the control word and activation code are the inverses of the fixed words.
The address format is identical to the control word and activation code formats regarding the number of bits, the ~ules for comma and the 1/2 bit space. The address Word 2 may be chosen from any word of the (23, 12) code set except the all 0's and all 1's cornbinations. Thus, there are 4094 potential second words made up of 12 information bits and 11 parity bits. The first words are chosen from a 100 word subset of the Golay code. To generate the binary hit patterns for the (23, 12) Golay code, the decimal representation of the code word is converted to binary. This binary representation is rewritten LSB to the left.
Tone only paaes are those paqer addresses which don't involve a voice message. Although the single call mode can be used, the batch rnode of operation is the ~ 3~7 ~ ~
preferred method of address transmission for tone only and tone and data pages. The activation code is generally not used in tone only paging, but it may he and an extended batch mode is especially useful in the hi~h traffic periods.
The batch transmission format begins with an inverted preamble followed by the control word and up to 16 pager addresses or data blocks. The arriving paqe requests should be gro~ped as a function of preamble and transmitted on a time or traffic basis at the ~iscretion of the terminal manufacturer and his customer.
It may be desirable to transmit more than 16 addresses within a single preamble batch. The extended batch mode is intended for these situations. The extended batch scheme extends the batch mode in multiples of 16 addresses without requiring the retransmission of the preamble. To accomplish this extension, the terminal need only send the control word. In theory, the batch could be extended indefinitely; however, a very slight degradation in pager sensitivity will occur with each extension.
The GSC format allows data pages to be intermixed with tone only or tone and voice pages A data page consists of a pager address followed by one or more data blocks. A data block is identical in length to an address block and may be freely substituted for addresses in the batch operating mode. The single call mode can also be used by following the pager address with the data message. Data information is transmitted at 600 BPS to minimize the cross falsing probability between addresses and data.
Fiqure lC shows for the ~referred embodiment of the present invention the timing diagram the normal message signallina ro~tine for a normal voice page format.
Figure 1C shows that a preamble code siqnal is transmitted followed by a control word and the address of the individual pager. While this is normal for the operation of pagers generally, the address is followed by an activation code and it is preferably upon the reception and detection of the activation code that the individually addressed paaer will co~mence its two second alert mode to warn the pager user of the presence of a subsequent voice message. At the conclusion of the variable length voice message the preferred embodiment shows the inclusion of a deactivation control word which for the preferred embodiment it is the second detected occurence of the activation control word and results in muting the audio channel.
Figure lD is a signal timing diagram showing some of the advantages which may be achieved by the use of an activation control signal with respect to the terminal control of a batch formatted group call. Figure lD shows that for the preferred embodiment a preamble inverted signal is broadcast followed by a control word and a series of up to 10 distinct addresses for various pagers.
Preamble inverse is used as an indicator in the preferred embodiment of the presence of more than one address and that the pager maintains the receive operation so that it will look for more than one address. This function will be described in greater detail in the description of the preferred embodiment in both its hardware and firmware equivalent embodiments.
Although each of the pagers has correctly detected its address none of them has caused any alert mode to initiate since the activation code as not been received.
At the conclusion of the tenth address, the activation code siqnal is sent which causes the simultaneous actuation of all ten addressed pagers. ~`or a voice paginq message call in a tone and voice system, all ten paqers simultaneously go into their approximate two second alert times to alert all of the ten various users for the present of a voice message which is to follow.
At the conclusion of the alert time the hroadcast voice 73~
message is simultaneously received by all ten address pagers. At the concl~sion of the variable length voice messaqe the second occurrence of the activation code is interpreted in the preferred embodiment as the deactivation control signal to cause muting of the audio channel for all ten addressed pagers and to enable the system to i~mediately broadcast additional addresses and other paging information. Thus it may be seen that the use of an activation control signal allows the terminal control of an arbitary batch of pagers to achieve a sim~ltaneous function. Moreover a message can be sent to a plurality of pagers arbitrarily selected at the terminal site into a hatch simultaneously.
Figure 1E is a message timing diagram showing the advantages of the use of an activation code to utilize normal unusable alert time for an individually addressed and activated pager to increase the information thruput for the message system by additionally addressing without activation an additonal pager. Figure lE in sequence shows that a preamble si~nal is followed by the customary control word, address 1 and an activation code for a first pager. Upon receipt of the activation code the address 1 pager goes into an approximate two second alert time to warn the pager user that a voice message is to follow. ~ormally for such tone and voice systems or other similar systems, no utilization can be made of the alert time delay. Thus there is a two second loss of otherwise valuable broadcast time during which additional information could be transmitted. As may he seen in Figure lE during the two second alert time the preamble control word and second ad~ress for a second pager can be transmitted without affecting either the operation of the first pager or the operation of the second paqer. At the conclusion of the second address the transmitter then provides the variable length voice messaqe for the first 1~

11 ~'7¢~`~35 paae which is received by the only addressed and activated pager number 1.
At the conclusion of the variable length voice message for pager number 1 the activation code second detection operates as a deactivation code for the addressed and actuated pager 1. This also corresponds to the activation code for the second addressed but as yet not activated pager, thus the second transmission of the activation code positively terminates the operation of the first addressed and activated pager and establishes the normal sequence for operation for the second addressed and now actu~ted pager.
In normal operation there is a two second address two page alert time durinq which time a third preamble control word and third address may he transrnitted to correctly address but not activate a third pager. As before at the conclusion of the third address the voice message for the second address pager commences and in a manner similar to the voice message for the first pager it will be concluded by the second occurrence of the activation code which for the address and activated pager

2 will be interpreted as a deactivation control word while simultaneously being interpreted bv the addressed but as yet unactivated pager 3 as the correct activation code for it to start its alert sequence. Thus it may be seen from Figure lE that the overall message information system can be tightly packed with complete utilization of the normal two second alert time which ordinarily would be lost to a transmitter system operator and thus materially enhance the information thruput for the system.
Figure lF shows the message timina diagram for an additional variant form of the use of the activation code for what may be referred to as a formatted terninal group call. While Figure lD shows the operation of addressing a strina of ten or more paaers, because of ,he ~7~
construction of the code signal population for the preferred embodiment it was necessary to use the preable bar designation to cause this system to go into a mode in which more than one address could be decoded. Of necessity this indicates that those addressed pagers must all be in the same proportion of the population so that they can respond to the same preamble. To demonstrate the greatly increased flexibility of an information system employing an activation control word, Fiqure lF' shows that the individual pagers which may be grouped do not have to be related by havinq a common preamble.
Figure lF shows that th the transmitter can provide preamble 1 followed by control word and address one which are followed by preamble two, a control word and address two, which is followed by preamble three, control word and a third address. The sequence is purely arbitrary and the length depends on how long the time period has been designated for the system to stay up and look for an activation code. The transmitter then provides an activation code signal which causes the simultaneous activation of all three addressed but not activated pagers from three completly arbitrary groupings of the possible receiver population. At the conclusion of the transmission of the activation code all three add~ess paging receivers simultaneously qo into the alert mode and at the conclusion of the alert mode all three pagers simultaneously respond to the then transmitted voice message which is terminated with the second occ~rrence of the activation code which for the three addressed and actuated pagers constitutes a deactivation control signal.
There are many other variant forms for com~inations of the use of an activation control signal and such a messaae information system. Figure 1G shows a message timing diagram for a substantially mixed system operation in which a preamble bar signal followed by a control word, three normal addresses, a data address, data information, a voice address for a fifth receiver, all cause three tone only pagers, one data pager and one voice pager to be correctly addressed hut not activated.
Normally for the preferred embodiment, the activation code is utilized for tone only operation but may be easily modified. The voice address for the fifth pager is then followed by the activation code which causes the voice pager to go into its alert mode so that the pager user can be prepared to receive the voice message. ~pon the reception of the activation code it will be appreciated that the first three tone only page carriers have received the signal that a page has been received and that the data page information and subsequent data information which can be also be encoded in such systems are already received.
During the alert time for the voice addressed pager nine additional tone only addresses can be broadcast followed by a short time gap for the system of the preferred embodiment which is less than one equivalent word length. This is then followed hy the variable length voice message. The variable length voice message is then supplied only to the fifth addressed voice paaer which has been activated by the first reception of the activation code. At the conclusion of the variable length voice message the second activation code terminates the operation of the voice channel for the fifth activated voice pager and also causes activation of the nine additional address tone only pagers so that no time is lossed in the system.
It will be appreciated by those familiar with such data information systems that normally tone only oreration causes an alert signal to be provided to the ~7~
paqer user for a fixed timeout period thus it is not necessary in the case of tone only pages to send a deactivation code to terminate the message since the receiver itself provides an alert for a short fixed length of time. Moreover it may be seen that addressing a data pager and following it subsequently with the data information and then in sequence and activation code will cause first the addressing and detection of the data message and subsequentlv the activation of the pager to announce the detected message. Those skilled in the art will appreciate that there are many other variant forms of the use of an activation code to material enhance the thruput of information in such information transmission systems, especially for the interleaving of messages of mixed type and for the simultaneous activation of previously addressed receiver units. This simultaneous activation can cause functions to occur simultaneously at various remote locations as in combination with the activation code used for selectively and sequentially addressed pagers can cause time sequenced of operations to occur at remote locations.

~ igure 2 shows the encoder fcr transmission of the activation code in accordance with the invention. Control logic 101 comprises a PLA (programmable logic array) that is the sequential logic control for the encoder. The timing for the PL,A is provided by timer 103. A word file which stores the digital address of a particular pager and also the digital word for the activation code is provided by a word file 105. A key pad 107 may be used by the operator to indicate to the encoder circuitry which pager the operator wishes to address. A keyboard decoder lO9 decodes the keyboard number entered by the operator and outputs an address signal to the word file 105. Simultaneously the key board decoder lO9 also notifies the control logic 101 that a key board number has been entered. Binary addresses from the word file 105 are loaded into a shift register lll thru a parallel data input. Shift register lll serially clocks out the data entered from the word file 105. The serially outputed data is sent to a transmitter 113 thru a selector circuit 115.
A voice storage unit 117 records a spoken voice thru microphone ll9 and amplifier 121 for playback thru the selecter circuit 115 to transmitter 113 at an appropriate time. rhe appropriate time is determined by the seauential logic control circuit lOl as will be more - ~6 -~L17~3~735 fully explained in connection with Figure 3. A talk light 123 indicates to the speaker when the voice record unit 117 is in the record mode. An exclusive-OR qate 125 inverts the outputted data from shift register 111 when the sequential control loqic 101 provides the exclusive-OR gate 125 with an appropriate input. A page button 127 si~nals the sequential logic control circuit 101 that the user is ready to send the address of the particular key on keyboard 107. A programmable timer 129 is loaded with appropriate time durations which serve to provide the maximum time durations for certain sequential operations to be described in connection with Fig. 3.
The encoder shown in Figure 2 is used to transmit data which is intended for a pager utilizing a battery saver mode of operation. The battery saver mode of operation for a pager is a well known method of extending battery life. In a battery saver mode of operation, the total number of pagers in a system are divided into subgroups. Each subgroup has its own particular address usually referred to as a preamble.
The keyboard 107 shown in Figure 2 has for illustration purposes four pagers divided into two battery saver subgroups. The number of total pagers and subgroups can be much greater and still operate in the same manner. Pagers 1 and 2 belong to a first subgroup and are addressable as a group thru preamble 1 and paqers

3 and 4 belong to a second battery saver subgroup and are addressable thru preamble 2.
Figure 3 shows the state diagram for the encoder circuitry of Figure 2. Each state is identified by a rectangle containing a short descriptive phrase. ~ach state is numbered chronologically from 0 to 25. As is immediately apparent from an inspection of Fig. 2, the operation of the encoder is best described in a time sequential manner ~rom the perspective of the control lo~ic 101.

The state diagram in Fig. 3 is broken into three operational branches. The first is a group call operation. If the operator at the transmitter site wishes to simultaneously send a single voice message to a group of pagers, a plurality of key pads on keyboard 107 corresponding to the pager addresses are pressed before pressing the ~age key 127 to cause transmission of the information. The second operational branch is the single voice page operation. This is the simplest o~eration for the encoder as it involves only a single key pad depression corresonding to a pager address followed by a single page key depression. The third operational branch, labeled interleavinq operation, utilizes the transmission time in a single voice page transmission that is usually "dead time" or alert time in which the particular pager being addressed cannot further operate on any transmitted siqnals. For this particular system, this "dead time" is during the period in which the pager sounds an audible alerting tone to its user after the pager has received its transmitted address from the encoder. The alert tone warns the user that a voice message is about to follow. Vsually the alert lasts approximately two seconds. Correspondingly, after an encoder has transmitted the address of the pager there is a two second period during which the encoder must wait before it transmits the voice message. In one aspect of the present invention during this two second period, the encoder can utilize the "dead tirne" to transmit a preamble, control word and address to a second pager whose key pad and page key have been pressed.
The state diaqram in Fig. 3 should be interpreted in conj~nction with the circuit diagram of the encoder in Fiq. 2 and serves as the basis for the operation description of the encoder. State O is entered by turning on the encoder and the encoder is ready to receive the signal of a first key depression. The 3~

control logic 101 is responsive at input B for a signal from the keyboard decoder 109 indicating that a key on keyboard 107 has been depressed. The voice storage unit 117 is neither recording nor playing. The talk light 123 is off. The selector 115 is in a ar~itrary state since the transmitter 113 is turned off. The inverter signal I
from control loqic 101 is also in an arbitrary state since the transmitter 113 is turned off.
In the preferred embodiment the clock CLC from timer 103 for controlling the internal timing of the control logic 101 is a 4.35 hertz clock and is continuously inputted to the load input of shift register 111 by way of the control logic 101. The address input of word file 105 is arbitrary in state 0. The page key 127 is also in an arbitrary state since the control logic 101 is inhibiting its B input. The shift register clock CK from timer 103 is set at 600 Hertz. When an individual page key of key board 107 is pressed, the key board decoder 109 latches the key number and sends a signal to the control logic 101 that a key has been depressed. The control logic 101 moves to a second state shown in Figure 3 as state number 1 (or the hit second key stage).
In state 1 the control logic 101 is responsive to a second key to be depressed. That key could either be a sinale key from the key board 107 or it could be the page key 127. The state of the control logic 101 and of the remainder of the encoder is the same as it was in state 0 except that now the control logic 101, in addition to keyboard 107, is responsive to a detection of the page key 127 at the B input of the control logic 101. The two events that may move the encoder out of state 1 have been mentioned before. They are either a page key depression or an second depression of a key pad on key board 107.

-- l 9 Group Call The event that will be discussed first is the second actuation of a key pad on keyboard 107. This event will cause a transision from state one to state two in the diagram of Fiqure 3. ~pon depression of a second key pad, the key number from key~oard 107 is latched into the key board decoder 109. The key board decoder 109 again sends out a signal to the control logic 101 at input H
that a second key nu~ber has been pressed. The occurrence of the second depression of the key pad on key board 107 causes the key board decoder 109 to toggle and to establish an output of the first key pad output code on the address lines of word file 105. This concludes the transition and the encoder is in state 2 as shown in Figure 3.
The state of the circuitry of the encoder in State 2 is unchanqed except the control logic is only looking for a page signal from paqe key 1. The encoder will move from State 2 to State 3 when it receives a sinnal from this paqe key. Immediately following depression of the page key, the control logic 101 will load a voice duration time into the programmable timer 129.
In State 3, the control logic 101 and the remainder of the encoder circuitry continues in the same state as it was in previously. Except now the T output of the control logic 101 actuates the talk liq~ht 123 and the record input (REC) on the voice storage unit 117.
The operator, noticing that the talk liqht 123 is on, can now speak into microphone 119 and his voice will be recorded in voice storage unit 117 by way of amplifier 121. After the operator has completed his message the pro~rammable counter 129 will time out the voice duration time and cause the encoder to change to State 4.
As the encoder enters State 4 the proqrammahle counter 129 is again loaded but this time with the time duration corresponding to the ~reamble transmission.
Simultaneously with the loading of the programmable timer 129, the control logic circuit sets both Ao and A1 output, which addresses word rile 105, to 0 in anticipation of sendinq the ~reamble address. The preamble binary code is now present on the output of the word file 105. In State 4, the control logic 101 turns off the talk li~ht 123 and turns off the record input to the voice storage unit 117. The control loqic 101 enables the B input of selector 115. The invert data output I of the control logic 101 activates the exclusive-OR circuit 125. Transmission of the preamble in an inverted format tells the ~roup of pagers recognizing the preamble that a group call made transmission is to follow.
The load input clock operation loads the binary word for the preamble into the shift register 111. The control logic 101 in State a inhibits reception of inputs from both the keyboard decoder 109 and from the page key 127. In State 4 the control logic 101 is uneffected by a pressing of the key pads of keyboard 107. Also in state

4, the control logic turns on the transmitter 113. The shift register 111, shifts out the binary code in a serial manner thru exclusive OR gate 125. The data is shifted out at a 600 Hz rate as determined by the 600 ~ertz clock inputted to the shift register 111 from timer 103.
As the data passes thru exclusive-OR circuit 125 it is inverted and then supplied to the B input of selector 115. The control logic 101 has told the selector to select the B input to be passed to the output of the selecter 115. Since the transmitter 113 is on, the preamble binary code will be modulated and transmitted.
After the programmable counter 129 has timed out the shift register 111 will have completed its serially output of preamble code. ~hen the time out occurs the ~ ~ ~It~ 7~5 control logic 101 and the remainder of the encoder transfers from State 4 to State 5 as shown in the diagram in Figure 3.
As the encoder enters State 5, the Ao and A1 outputs of the control logic 101 are both set to a 1 level. In State 5 the encoder sends the control word which serves to alert the group of pagers under the previously sent preamble that a nessage is about to follow. In state 5, the invert output of control logic 101 which inputs to exclusive-OR gate 125 is deactivated.
The binary code for the control word is outputted by word file 105. It is loaded into the shift register 111 by a load signal from the control logic 101 and serially clocked out of the shift register 111 and into the transmitter 113 by way of selecter 115. In State 5 as in State 4 the control logic 101 is still actuating the B
input of selector 115. Also the control logic 101 still has the transmitter 113 turned on. As in State 4, the control logic 101 in State 5 has deactivated inputs from the keyhoard decoder 109 and its inputs from the paqer key 127. The control logic 101 internally times the sending of the control word and moves to state 6 after the time period has timed out. In the transition to State 6, the AnA1 outputs of logic control circuit 101 changes to 0 for A1 and 1 for A1.
In State 6 has shown in Figure 3, the first pager address is transmitted. The pager address identifies a particular pager within the selected preamble group. In response to its input address the word file 105 supplies a binary code to the shift register 111. As before the shift register 111 loads the binary code and clocks it out thru the exclusive-OR circuit 125, the B input of selector 115 and finally out to the transmitter 113.
After the shift register 111 is loaded with the binary code for the first address and benins to serially output the data, the control logic 101 must toggle the '7~
latch toggle line, LA, to keyboard decoder 109. This causes the key board decoder 109 to present at its output the second pressed key pad number code. The encoder transfers from State 6 to State 7 in accordance with the internal timing scheme of control logic 101 when the internal control logic of control circ~it 101 determines that the first address has been sent.
In the beginning of this state 7 the keyboard decoder 109 is providing the address corresponding to t:he second key pad depressed. The output of word file 105 is the binary code for the pager address identified with that particular key pad. The shift register 111 is loaded again, as before, but this time the data loaded is the binary code of the pager address of the second key pad pressed. Again the data is serially shifted out thru selecter 115 and to the transmitter 113. After the shift register 111 is loaded, the control loqic 101 changes the Ao output level to 1. The control logic 101 determines by internal timing when the second address has been serially transmitted. At the end of this time the encoder transfers from state 7 to state 8.
In State 8 with the Ao output level at 1, the word file 105 binary address requests for the control word again. The word file 105 outputs the hinary code for the control word and the shift register 111 loads the binary code and serially shifts the data out to the transmitter 113. The programmable timer 129 is set internally to time the tone alert or beep time d~ration which will occur at the pager when it receives the control word.
This timing of the beep duration is state 9 after the control word in state 8 has been sent, the encoder moves to state 9 where the internal counter 129 times out the beep duration. The alert time duration represents the time period of which the paqer units ~sounds a tone to alert the ~ser that a voice message will immediately follow.

~ ;2 ;2 ~

In order to avoid transmittina during the time that the pager is beeping, the programmable timer 129 counts that beeping period as measured from the time of transmission of the second control word and ensures that no transmissions occur during that time (usually around 2 seconds). At the end of the beep duration, the timer 129 times out and the encoder moves to state 10 as shown in Figure 3.
As the encoder moves to state 10 the control logic 101 loads the programmable timer 129 again. This time with a binary code for the duraticn of the voice to be transmitted. This time duration is preferably constant, there~y allowinq for a maximum stored message length.
The time duration is determined by the running time of one complete loop of the voice storage unit 117.
In State 10, the control logic 101 activates the play input operation of the voice storage unit 117 and actuation the A input of selecter 115. The transmitter 113 is turned on. The recorded voice is transmitted over transmitter 113 and the encoder waits for the timing out of the voice duration time in proqrammable timer 129. At the end of the time out the encoder returns to state 0 as is shown in Figure 3.

Single Page Referring back to the second state transition option in State 1, a paqe key can be depressed in state 1 instead of a second address key. Depressing the page key transfers the encoder from state 1 to state 11. In the transition from state 1 to state 11 the programmable timer 129 is loaded with a voice duration ti~e period.
In state 11 everything in the encoder is as it was initialized in state 1. The talk liqht is turned on and the record input to the voice storage unit 117 is also turned on and heains to record. If while in State 11 a ~L~ 7~ 5 kev pad on keyboard 107 is aqain depressed, its address will be latched into the key board decoder 109. By analogy State 11 is identical to state 3 discussed previously except that in state 11 the encoder is looking for a time out message from programmable timer 129 and a page key detection at input B of contro~ logic 101.
Two possible transitions exist from state 11, the encoder can move to state 12 or to state 16. The transisiton from 11 to 16 will he described later in the discussion of interleaving. If no additional key address is pressed, then the encoder will move to state 12 when the programmable timer 129 times out. During the transition the programmable timer 129 is loaded with the time period re~uired for the transmission of the preamble.
In State 12 the encoder outputs are in the same condition as they were in state 4 except the inverting output, I, of the control loqic 101 is not activated.
Also the control logic is now sensitive to a page signal at its B input as it was in State 11. The transition from state 12 can be to two different states. State 18 or from state 12 to state 13. If a new key address is pressed at the keyboard 107, the transition will be from state 12 to state 18. This transition will be described later. The transition from state 12 to state 13 is identical to the transition from state 4 to state 5.
State 13 is substantially the same as state 5 except the control loqic 101 is looking for an input from the page key as it was in States 11 and 12. From state 13 if a paqe key is detected the transition is to state 19.
This transition will be discribed later in connection with interleaving. Without a page key detection at the input of control logic 101 the transition from State 13 is to State 14. This transition is identical to the transition from State 5 to State 6.

a 5 State 14 is substantially identical to state 7 except that the control logic 101 is still looking for a pa~e key signal as it was in states 11, 12 and 13. If the control logic 101 receives a page key signal at its B
input the encoder will experience a transition from stage 14 to 21. This transition will also be described later.
Without a page key signal detection, the encoder will transfer state 14 to state 15. This transition is identical to the transition from state 7 to state 8.
State 15 is substantially identical to state 8 except that the control logic 101 is still responsive to a page key signal at its B inputs as it was in states 11-14. If the page key signal is detected by the control logic 101, the transition for the encoder is from state 15 to state 21 which will be described later in connection with interleaving. Without a page key detection the encoder transfers from state I5 to state 9 as shown in Figure 3. This transition is the same as the transition from state 8 to state 9.

Interleavinq . The state transitions whose discussions has been deferred will be covered in the description of the interleaving operation. Returning back to state 11, if a paqe key is pressed while the encoder is in this state, the transition will be from state 11 to state 16. In this transition the programmahle timer 129 continues counting from state 11 into state 16. State 16 is substantially similar to state 3 with the transition being caused by the timing out of the programmable timer 129. ~rom state 16 the transition is to state 17. This transition is the same as the transition from state 3 to state 4 except that the invert si~nal, I from the control logic 101 into exclusive-OR 125 is not activated.

~7~37~35 State 17 is substantially similar to state 4. The transition from state 17 is to State 1i3 is identical to the transition from state 4 to state 5. State 18 is substantially similar to state 5. The transition from state 18 to state 19 is identical to the transition from state 5 to state 6. State 19 is substantially similar to state 7. The transition from state 19 to state 20 is identical to the transition from state 7 to state 8.
State 20 is similar to state 8, except that the control logic 101 toggles, through its LA output, the keyboard decoder 109 to cause the key decoder to output on lines A2 and A3 the most recently pressed key pad on keyboard 107. The control logic 101 sets both Ao and A1 to 0. The programmable timer 129 is loaded with a time duration sufficient for the transmission of the preamble in state 21. The transition from state 20 to state 21 is automatically timed in control logic 101.
In state 21 the encoder is in a state identical to state 4. The transition from state 21 to state 22 is identical the transition from state 4 to state 5. State 22 is identical to state 5. The transition from state 22 to state 23 is identical to the transition from state 5 to state 6. State 23 is substantially similar to state 7. The transition from state 23 to state 24 is identical to the transition from state 9 to state 10.
In state 24 the encoder is in a state substantially similar to state 10 except the control logic 101 is sensitive to a paqe key depression and the talk light 123 and voice stora~e unit 117 are turned on. The operator's messaqe directed to the second keyed pager is now recorded into the voice storage unit 117. The second voice messaqe is associated with the key pad and page key pressed and sensed in state 11. The transition from state 24 to state 15 is caused by the timinq out of the control timer 129 without a page key being pressed.

~:~ 7~3 a ~
F`rom state 15 the sequence repeats its normal pattern to either state 9 or state 21. If a page key de~ression is sensed in state 24 the encoder will transfer from state 24 to state 25. This transition is identical to that from from state 11 to state 16. State 25 is substantially similar to state 10 except that the control logic 101 holds the talk light 123 on and also contin~3es to record the next voice message. After the completion of the second voice message, the encoder transfers from state 25 to state 21. From state 21, the encoder repeats the steps from state 21 thru state 24.
At state 24 the encoder again looks for a page key depression. A detection of the page key hit determines whether the next state of the pager is state 15 or state 25 as was ~escribed earlier.
State transitions from sinqle paqe operation into interleaving operation are caused by the encoder detecting a page key depression while in states 12, 13, 14 or 15. A page key depression detected in these states will result in the encoder transfering to a interleaving state. States 12, 13, 14 and 15 will transfer to states 18, 19, 20, 21 respectively. If the encoder enters interleaving at state 21, the encoder must toggle the LA
input to keyboard decoder 109 in addition to its normal operations in state 21.
It should be noted that if a squelch mechanism is used to terminate voice transmission, there would be a need for two voice storage units. The need arises since with a squelch mechanism the two voices stored in the voice storaqe units are no lonqer necessarily the same time length.
It should also be noted that the encoder of the invention can be incorporated into a telephone exchange system in a well known manner.

2~ -7~
Table l on the following page is atime se~uential logic table of the PLA comprising control loglc 107 in accordance ~ith the invention.

~'9'9'7~

V
U

E U~ C~ U h _/ CV ~ 11 11 o U ~
Ll ~ O

V

O XXXXXXXXOOX_l_IXXXXXXXXOOX-~XX
R:~ XXXXXXXXoo_~oo.-1XXXXXXXoo_lo_lX
,:1 ~ OOOOOOOOOOO_lOOOOOOOOOOOOOOO
~0~ XXXXXXXO_l~OOOOXXXXXXXOOOOOX
X O o o o o o o o ~ I O O _~ _l O O O ~ I O O
lC VU~ XXXXXXXXOOOOOOOO~ XXXOOOOOO
C~) ~ OOOOOOOOOOOOOOOO~ OOOOOOOOO
O OE'l oooooo~ ooooooooooo_l~ooooo_l a o _l o ~ o ~ o o _~ o _1 o _1 ~ O O o ~ _l o o _~ o ~ o a-~ o _l o ~ ~ o o o ~ o o o ~ o _1 ~ o o o ~ _~ o o a~ o o o o o o o ~ l o o o o o o o o ~ ~ o o a O O O O O O O O O O O O ~ O ~ ~ O
a~ o o o o O o O o o o o o o o o o o o O O O O O O O O _, C~ C~ O O ~1 --I O O _l _I O O _~ O ~ G .-1 _I O O _~ O _I O O _I O ~ _~
v ~ o o o o --l ~ ~ ~ o o o --l ~ o o o ~ o --~ --i o o o ~
V~O oooooooo~ Ioooooooo~ ~10 c~ ~
o o o o o o o o o o o o o o ~ ~ ~ o ~ ~
~ o o o o o o o o o o o o o o o o o o o o o o o o o o o o v x x o o o - l x x x x x x x x x x x x -l o o o o o o o -l ~ -- o ~ o x x x x x x x x x x x x x x o x x x x x x x x c-2, x x x x x x o ~ o -l x x x x o ~ o -l x o ~ o -~ x x x o '735 o C~ ~o .
E
O G~
P~ . ~

X X o o X _l ~ X X o o _l o ~i oooooo ~ X X o o o o O X O o ~
~1 ~ o X 3 o o o t~ oooooo ~ ~ o o o o a:
E~ a o _l _l o _~ o o O O ~ ~ O
oOOoO~
O

o O O _l _, O
ol O O O O ~
C~ O O O O . O O
o o o o O o O
Cl~
~ X X X X X X
::: X X X X X X
ô o ~ o ~ X X

Fiaure 4 shows the functional block dia~ram of the encoder for the preferred embodiment of the invention in which a microphone 200 is coupled through an audio amplifier 202 to a preemphasis circuit 20~ which finally produces an audio signal. This audio siqnal is supplied to a pair of transmission gates 206 which, as will be described in detail later, allow for the selection of either audio or data information to be transferred to the modulating input of a transmitter 208. An antenna 209 is coupled to transmitter 208. The transmission gates 206 are preferably of the type manufactured by ~otorola and designated MC14551. A keyboard 210 is coupled to a CRT
212. This combination is preferably a Lear ~iegler Model ADM-3A. The RS232 output of the CRT is coupled to a 6800 base computer 214 ~hich further incudes the several additional modules which are: a MEX 6820 I/0 module, a 68MM19 6809 monoboard, microcomputer, a MEX6812-1 2K
static RAM, and a M68MMCC05 Card Cage for a micro module.
A PB0 output of computer 214 is coupled to the data input of transmission gate 206, the input of an audio data select circuit 216 in the input of an audio/data detect circuit 218. The output of the audio/data select circuit 218 is coupled to the selection input the transmission gate 206. A zero logic level at this selection input terminal indicates that the data transmission gate is activated and a 1 level indicates that the audio information aate is activated to supply the corresponding information to the modulating input of transmitter 208.
The output of audio data detect circuit 218 keys the transmitter so that the operation of audio data detect circuit 218 is similar to an ~P~ function in that if either siqnal is detected as being present at its input, the transmitter is keved so that input may be modulated by the RF carrier. The combined signal is supplied to antenna 209 for broadcast.

â~

Fi g ure 5 shows the detailed circuitry for 2Ud io/data detect circuit 218 and audio data select circuit 216.
The PBO output of computer 214 is couPled to the input terminal of audio data detector 218 which comprises a retriggerable monostable. The circuit operates to maintain a constant signal output so lonq as a signal ed~e is detected within a predetermined time period of every 100 milleseconds. The absence of detected signal edge durinq that time period would indicate that neither data nor audio signals were present.
In operation the audio/data decector circuit 218, the P~O output terminal of computer 214 is coupled directly to a first input of an OR gate 230 and through an inverter 230 to the second input. The output of OR
gate is coupled to the trigger input of a monostable 234 which may be implemented using one-half of an IC
designated MC14538. A timing network is provided for the monostable and VDD, the source of voltage, is applied to the clear input terminal of monostable 23g. The VDD is also applied through a resistor 236 to a timing input of the rnonostable and through a capacitor 238 connected to ground. The combination of the resistor 236 and capacitor 238 provide a timing circuit for monstable device 234. The Q1 output of monostable 234 is coupled directly to transmitter 208 as shown in ~iqure 4 to provide the transmitter keying control signal.
The function of the audio data dector 218 is to receive within every 100 millesecond interval an edge indicating that either data or audio siqnal is present on the line. As each edge is detected in the OR gate, it retriggers rnonostahle 234 for its predetermined time. As long as pulses are received at an interval that is less than the normal time out for the monostable, A ~1 output of monostable 234 in audio data detector 218 ~1il] remain at a loqic level therebv keying the transmitter.

The PBO output of computer 214 is also connected directl~ to the first input of an OR gate 240 and through an inverter 242 to the second input of OR gate 240. The first input of OR 240 is coupled to ground. The output of OR 240 is coupled to the trigger input of a second retriggerable monostable 244. Monostable 244 is preferably half of the same IC package which was utilized to implement audio/data detector circuit 218. For monostable 244, VDD is applied in the same manner to produce somewhat different timing characteristic for its operation. This new time is chosen by the value of a resistor 246 and capacitor 248 which are coupled to the timing inputs of monostable 244. VDD is also connected to the clear input terminal of monostable 244. The Q2 terminal of monostable is coupled to the D input terminal of a data flip-flop 250.
The PBO output of computer 214 is also coupled to the clock input of D flip-flop 250. The set input of the data flip-flop 250 is connected to ground. Flip-flop 250 is preferably one-half of an IC designated I~C14013. The Q output of flip-flop 250 provides the control signal output of audio/data select circuit 216 which is supplied to transmission gates 206 and causes the selective activation of one of the gates depending upon whether either the audio or data information is to be supplied to the modulating input of the transmitter.
When it is desired to transmit an audio signal, the encoder for the present embodiment is designed to re-spond to the presence of a 600 Hz sianal so that the activation of an external microphone or other voice storaqe and forwardinq device mav be achieved to insert the voice message into the transmission at the appropriate time. There are several other reasons for using various square save signals at predetermined frequencies but with respect to the present invention only the presence of a 600 Hz sianal is used for this specific purpose.

~ 7~73~

Audic data selection circuit 216 operates as a tone detector in which OR 240 is triggered on the detection of a squarewave signal edge to produce a relatively long duration output pulse at the Q2 output terminal of monostable 244. This signal is supplied to the D input of the flip-flop which is also coupled directly to the PBO output of computer 214 through its clock terminal.
If the long duration pulse from the monostable continues during the time that a subsequent squarewave signal edge is detected from the PBO output of the computer t data flip-flop 250 is either maintained at or is togaled to the 1 logic level output at its ~ terminal. This indicates detection of the 600 ~z signal. Termination of the long duration pulse from the monostable before an edge occurs at the clock terminal of the data flip-flop would cause it to toggle to zero or maintain it at zero thus indicating that no 600 Hz audio sianal had been selected and therefore no audio siqnal was to be transmitted.
Figure 6 represents the flowchart for the firmware operation of the encoder shown in Figures 4 and 5. When the encoder is activated, it goes through an initialization routine in which all registers are set so that the program can be loaded and executed. After initialization, control is transferred to a decision block at which time the operator selects control mode.
There are three possible control modes; first is the selection of multiple queue transmissions; the second is the selection of single queue transmissions; and most important]y the third is the selection for the block number and type of information to be transmitted.
The block number allows the operator to select in a given message sequence exactly where information is to be inserted. The type of information refers directly to the coding system utilized and allows the operator to select the preamble number and the duration of the preamble ~179~3~

signal and to select the first and second address words for the echo coding system of the preferred embodiment.
Completion of this operation establishes the addresses of the pagers which can be paged. In normal operation, sub-scriber addresses would be maintained in a memory file status so that individual pagers could be correctly addressed.
The ne~t operator choice is the selection of whether or not to specify numeric data information which produces a block of numeric data suitable for transmission to a numeric or data paqer. The last operator selection is a frequency signal ~hich for the preferred ~SC coding embodiment is indicative of a tone and voice operation for pagers. This has alreadv been described in detail.
At the conclusion of the selection of the four types of information, control is transferred to a decision block to determine whether or not all of the selections are completed. If not, the control of the operation is again returned to the select block of number and type operation at which time additional locations for blocks of information may be selected and additional types designated. The selection of the block number and type of information and whether or not the message is to be data tone only or tone and voice would be made for each block of information. After all of the decisions are made and the operator is finished with the block selection, control of the operation is returned to the select mode decision block at which time the operator can choose among the three possible mode operations including adding additional information to the assembla~e of blocks and information.
The selection of multiple queue transmissions or single queue transmissions enable information of the designated blocks in sequences of information to ~e sent singly, that is in one transmission, or to be repeated a nu~ber of times. Normally, only the single ~ueue ~7~73~

transmission would be used, however for the purpose of sending extremely long messages, the use of a redundancy can be built in to ensure even greater reliability of the reception of long complex messages.
At the conclusion of the select queue operation for the transmission, control is transferred to the transmit decision block. If at this time the operator elects no transmission, operation of the program is again returned to the select control mode. If the operator chooses to transmit, control is transferred to the start timer operation.
The start timer operation takes the hlocks of information and formats them into various transmission patterns. At regular intervals of 1200 times per second, the information stora~e buffers in which the information has been formatted are accessed by a timer interrupt routine which takes the output of a given buffer and provides one bit of information to a sequence control operation so that the transmission pattern may be sent out one bit at a time. At the end of each interruption, control of the program returns to the formatting operation at which time additional information may be loaded into the buffers.
In operation the format control takes the blocks of information as designated and selected and loads them into temporary storage buffers so that they may be emptied on a time interrupt bit by bit basis and provided to the transmitter. The output from the transmitter is digital logic signals superimposed on a carrier at the rate of 1200 bits per second.
As the various information storage buffers are emptied on a hit for bit hasis, the formattina routine continues to load the additional selected information.
The buffers may be drained serially to produce the message sequence. At the end of the information in the last stored buffer, the decision to end transmission is made. If it is not the end of the transmission, control ~L~'7~'7~

is returned to the formattinq block so that additional transmission patterns may be loaded into the information storage buffers so that they may be accessed to provide the information for the transmission. If the decision from the end of transmission decision hlock is to stop, then a stop timer routine is activated at which time control is transferred back to the select control mode operation.
Included with this primary flowchart is a separate secondary flowchart for the timer interrupt routine which on a regular 1200 times per second basis interrogates the information sequence stored in the storage buffers and provides an output that to the transmitter. At the conclusion of the transfer of each bit of information control of the operation is transferred back to the formatting operation in the primary flowchart.
Table 2 shows the hexadecimal core dump of the entire firmware coding program consistent with the language appropriate for the computer shown in Figure 4.
Loading of this code into the ROM will provide the operation described bv the flowchart in Figure 6.

~. ~ 7~?1 7~

~3L~ 2 ~e0 8_ ?e Qa ~D !)4 A7 8E 00 G~0 ~6 04 81 30 27 03 BD
3010 D~ B~ ~5 0B ~D D4 34 ~5 23 BD D4 :B4 9E 11 ~5 84 302~5 _4 ~0 81 E0 27 0g ~ ~B 5B ~D D4 A7 7E D3 3 9:E
3030 11 A6 84 Q~ 0F 1 E ~9 4D 4~ 3~ 04 AB E0~Q,3 D~ 54 304e 9i`lQ, 35 lg 34 04 ~i3 E0 57 1 D6 13 C~ 00 D7 1~
30~0 9~ lQ 5~ ~4 7E Dl c,C 7E D0 Q4 7E ~1 C0 7E Dl ~3 .3i360 7E~:)0 D0 7E D2 61 7E D2 h7 7E D2 CB 7E D2 E2 7E
3q570 33 14 7E D0 25 7:~ D0 20 7:E D0 25 7E D0 25 7E D0 3080 25 7E D0 25 8~ ~0 8 ~3~ D4 ~7 5E 11 h6 02 BD. D4 3090 BC 16 03 3D D4 ~ A5 04 ~D 1:;4B4 16 0~ :BD D~ 34 30h0 ~5 06 !33 D4 B4 h6 07 B~ D~ 5 2E BD D4 34 ~ 6 30B0 01 R5 01 26 0A 9~ 11 .45 01 as 02 26 0A 20 0 Q~
30C0 E~ ~1 3D D4 ~7 2$ E~ 8B ~0 C~ ~D D4 A7 7~ D3 a3 ~0I)0 8E ~0 E2 BD D~ A7 9E 11 A5 02 84 0E 81 01 27 11 2 27 12 81 04 ~7 13 81 0Q 27 1~ 1 11 20 30F0 12Qi;~ F0 36 20 0D 8E ~0 rD 20 08 ~ :Fl04 20 B3 3100 8E Fl 0B BD D4 A7 8E ~1 19 ~D D4 17 8B ~1 25 3D
3110 D4 A7 9~ 11 A6 01 BD D4 ~4 P5 2E :BD D4 34 8E ~1 3120 3E ~D D A7 BD Dl 30 8E ~1 5~ 3D r4 A7 7E D3 93 3130 aE 11 ~.6 03 BD D~ 34 46 0~ ~3D D4 ~4 A6 05 BD D4 3140 B4 16 06 BD D4 ~34 16 07 ~D D4 B4 ~9 8E ~1 5E BD
31~0 D4 47 9E 11 k6 02 3D D~ 34 A6 03 BD D4 ~3~ A6 03 3160 85 01 25 07 86 23 BD D4 34 20 06 8E ~1 6C BD D4 3170 A7 9E 11 Aô 01 Q5 01 27 06 8~ Fl 77 ~D D4 A7 8~
31Q0 ~1 8C :!3D D4 A7 gE 11 ~ 5 03 85 01 26 2~ 16 07 ~D
31C'0 D4 :B_ 9~ 11 16 B6 85 02 26 07 86 2E ~D D4 ~4 Z0 311,0 06 8~ El ôC 3D D4 l7 ~ 11 A6 ~1 85 02 27 0E 8E
31~;0 31 77 ~D D4 A7 20 ~5 8:~ ~1 9 C :3D 1i4 ~7 7~: D3 93 ~;iC0 8E El A2 3D D4 ~7 9E 11 86 B6 97 lA A6 02 :BD D3 31r0 3A 30 01 0~ lA 25 F5 86 2E BD D4 B4 93 11 A6 01 31E0 Q5 04 27 06 8:E ~1 136 BD r~4 A7 9E 11 ~6 01 85 01 31~0 27 0O 8E ~1 77 ~D D4 A7 7E D3 93 8E 31 DB :BD D_ 32B0 17 PF ~1 .A.6 BD D4 l7 8E 00 lB 9~ 21 9E 11 9~ 23 3210 aE 23 A~ 02 30 01 9F 23 9~ 21 17 84 30 0~ 9~ 21 3220 8C 00 21 26 E3 C6 08 8E 00 lB 4~ 69 84 49 ~0 01 3230 QC 00 21 26 i'6 8B 20 Br D4 B4 5~ 2~ EA 85 2E ~5D
32 ~5 D4 B4 9~ 11 A6 Bl P5 04 27 ~6 8E Fl 36 BD D4 ~7 3250 E 11 A6 01 85 01 27 ~6 8E Fl 77 BD D4 A7 7E D3 3250 3 8~ ~1 E6 BD D~ L7 ~E ~2 02 BD D4 A7 9E 11 6D
3270 01 27 11 86 2~ BD D4 B4 A6 Bl BD D3 3A 86 2E BD
32Q0 D4 B4 20 06 8E ~1 9C Br D4 A7 8E ~1 3E ~D D4 17 32g0 E 11 C6 05 A 6 03 BD D~ B4 30 01 5A 2~;E6 8E Fl 32~0 ~4 BD D~ A7 7E D3 C3 83 F2 13 BD D4 A7 9F, 11 A6 32B0 01 BD D4 34 86 2E BD D4 B4 8E Fl 3E ~D B4 A7 BD
32C0 Dl 30 8E ~1 ~4 BD D4 ~17 7E D3 93 8E F2 26 BD D4 32D~ A7 PE El 3~ ~D D4 A'; BD D3 81 86 2E BD D4 B4 7E
32 0 D3 93 8E E2 3g BD D4 A7 9E 11 ~6 03 BD D4 B4 ~E
32F0 El 6C BD D4 A7 ,R E ~2 4E 3D D4 A7 BD D3 81 86 2~

.5300 BD D4 B4 9E 11 A6 01 5 01 27 06 8E ~2 7l BD ~4 3310 A7 7~ D3 93 8~ ~2 h5 B~ D4 ~.7 9~ 11 16 e4 BD D~
5320 B4 BD D3 81 86 2E 3D D4 B4 9F 11 A6 01 85 ~1 27 5330 05 ~E ~l 77 BD D~ h7 7E D3 93 34 02 84 0~ BD D3 33~0 43 35 02 44 44 44 44 BD D3 ~B 39 81 0D Z7 18 81 3350 0~ 27 18 81 BA-27 18 81 0B 27 1~ 81 00 27 18 81 3350 0C 27 18 8A 30 20 16 86 2e 20 12 86 2D 20 0~ 86 3~70 30 20 0.l 86 2F 20 06 86 45 20 02 86 00 BD D~ B4 33~0 39 9~ 11 16 05 BD D4 B4 A6 06 3D D4 34 16 07 BD
33~ D4 B4 39 BD D5 31 39 8E 00 84 6~ 8~ 3B el 8C 01 3340 6~ 26 ~7 8E 00 90 9F 9C 9F 9E 86 0F 97 94 8~ DE
33B0 D4 9F 10 86 98 97 7~ 4C 97 7E 97 7D 7F ~C 18 B6 33C0 E5 19 B2 EC lC 12 lC r~ g6 80 9A 81 9l 82 26 15 33D0 96 0 9A 91 gl 92 9l. 93 26 ~6 12 ll 1~ 86 01 B7 33E0 ~5 18 7E D5 31 8~ 00 03 lA 01 16 89 00 7~ A9 ~9 33~0 00 7C 19 A7 89 ~0 7~ 30 lF 26 ~F 8~ ~2 00 9~ 11 3400 9~ 11 L6 84 84 F0 81 F0 26 B~ A6 ~4 8E D4 24 9~
3410 86 84 0F 48 9B 87 g7 87 g6 86 89 00 97 86 9E 86 3420 ~E 8~ 6E 84 D4 38 DC 01 D9 69 D4 38 D7 9F D4 38 3430 D4 38 DA 38 D7 31 ~4 38 96 12 8B 08 97 12 96 11 3440 89 00 97 il 7~ D4 00 12 lA 10 10 C~ El ~F 8E DE
3450 6~. B~ FF F8 86 B3 B7 90 02 86 04 ~7 0 03 86 Cl 3~60 B7 ~C 19 8~ ~0 07 BF ~C lC 86 03 ~7 ~C 14 86 91 3470 B7 EC 14 86 00 97 83 8~ F8 3~ 9F 0C 4E 84 AD 84 3480 20 ~l B6 EC 14 c7 24 ~4 B6 rc 15 44 7~ 34 04 ~6 3490 EC 14 57 57 24 ~9 B7 ~C 15 35 04 3 BD D5 31 ~E

34B0 01 20 F4 39 D6 ~3 C5 ~e 27 1~ 34 02 81 01 27 09 34C0 86 00 BD D4 8D 35 02 20 0~ 86 32 97 17 85 00 BD

34~0 15 ~D D5 31 E6 ~4 Cl 04 27 lB BD D4 82 g7 0E Cl ~4F0 ~1 27 21 34 04 Al ~ 27 14 30 01 30 01 30 01 ~6 ~ ~L'7~ `5 3C0B ~4 Cl 04 26 :5~ E 1 5 ~D D5 3.~ 39 20 E6 3D D5 35 3ClB BD D5 3A 3g 30 Zl .1.l 84 25 0~ 30 gl Al 84 22 D9 3c20 cE ~5C ~D D5 2D ~D D5 3l 39 3Q 01 20 CC 9E 0C 20 3C30 04 9E 0C 30 Bl 30 01 9Y (3C 3a ~E 84 9~ 0C 39 9 ~540 0C ~.6 09 34 0~ ~6 ~8 34 02 1.6 07 3~ 02 .~ 6 06 34 3Cl50 02 A5 05 34 02 15 04 34 g2 3~ ~1 30 01 3D D5 3A
3C50 7~ D4 7C 1~ 41 ~.E 02 2B 0A 1~ 41 AE 0~ 20 04 1 3580 61 32 51 E 0C 33 8E 00 73 6~ 84 30 01 8C 00 7B
35g0 25 E7 7E D5 31 ~E D5 9~ 9~ 25 7~ D5 31 31 38 81~
35.~0 00 '~3 85 ~B 17 84 g6 2c A7 02 ~D D4 1~4 96 26 A7 35R0 03 ~D D4 34 3D D5 31 8c 01 27 03 7~ D5 3A 7E D5 35C0 31 86 ~1 9? 73 7E D5 31 8E 00 73 A6 01 8A 01 17 3 cr:0 Bl 7~ D5 31 8E 00 73 l5 01 8A 02 A7 01 7E D5 31 3CEB ~E 00 73 ~6 05 8A 02 ~.7 06 7E D5 31 :B~ D5 31 A6 35~0 84 lE 8S LD :BD D5 2D A3 84 8E 00 72 9~ 71 9 72 3500 97 72 95 71 89 00 97 71 ~3~ 00 0B 9~ 7:B 9E 7B A6 3610 84 30 1~ g~ 73 gE 71 A7 84 30 1~ 9~ 71 5A 2~ ED
3520 7E D5 2D 9~ 23 8~ 20 73 9~ 71 C6 08 9E 71 3530 A5 84 30 01 9~ 71 93 23 ~7 8~ 30 01 9~ 23 5.~ 2E
3640 ~D 7E D5 31 8~ 00 73 ~6 0~ ~ A 01 17 01 73 D5 31 3650 8E 00 00 9~ 73 ~R,E B0 73 9~ 71 0~ ll C6 0C E 7B
3560 A5 84 _`A 30 0i 9~ 7B 81 00 26 B4 0C lA 20 ~F 81 3670 20 26 04 86 0D 20 22 81 2D 26 04 86 0E 20 lA 81 35Q0 30 26 04 86 0~ 20 12 81 2~ 26 06 86 eB 20 01 81 3550 45 26 04 86 00 20 02 84 0~ 9E 71 34 0_ D0 lA C5 36~.0 01 27 04 ~7 ~2 2B BC 48 48 48 ~8 ~.A 02 17 02 30 36~0 01 9~ 71 35 04 5D 2g 16 D6 lA 5A C5 01 27 06 86 35C0 ~C A7 02 20 03 85 C0 AA 02 l7 02 30 01 5D 2E EA
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Claims (21)

1. A method of encoding information signals including a receiver address, for transmission of information to a plural population of receivers, each said receiver being capable of selectively establishing more than one time period for address correlation and having a predetermined alert sequence, comprising the steps of:
generating a first set of coded signals to establish one of at least a first and second time period for said plural population of receivers to correlate for an address;
generating a second set of coded signals to select at least one selected receiver of said plural receiver population.

2. A method of encoding, according to claim 1, further comprising the step of:
generating a first activation code signal subsequent to said second set of coded signals for activating the pre-determined alert sequence of said at least one selected receiver.

3. A method of encoding, according to claim 2, further comprising the step of:
generating additional said first and second sets of coded signals for at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

4. A method of encoding, according to claim 1, wherein said step of generating a first set of coded signals includes the steps of:
generating one of a preamble signal and an inverted preamble signal thereby selecting one of the first and second time periods, respectively, of said at least one selected receiver.

5. A method of encoding according to claim 4, wherein:
selecting said first time period causes at least one selected receiver to correlate only one said second set of coded signals, and selecting said second time period causes said at least one selected receiver to correlate a plurality of second sets of coded signals.

6. A method of encoding, according to claim 1, further comprising the steps of:
generating a third set of coded signals for causing said at least one selected receiver to continue to correlate for an address; and generating at least one additional second set of coded signals for selecting at least one selected other receiver of said plural receiver population.

7. A method of encoding information signals including a receiver address for transmission of information to a plural population of receivers, each said receiver being capable of selectively establishing more than one time period for address correlations and having a predetermined alert sequence, comprising the steps of:
generating a first set of coded signals for selecting at least one selected receiver of said plural receiver popula-tion;
generating a first activation code signal subsequent to said first set of coded signals for activating the pre-determined alert sequence of said at least one selected receiver;
generating at least a second set of coded signals for selecting at least one other selected receiver of said plural receiver population during the duration of said pre-determined alert sequence of said at least one selected receiver.

8. A method for encoding information signals including a receiver address for transmission of information to a plural population of receivers, each said receiver having a predetermined alert sequence, comprising the steps of:
generating coded signals for selecting at least one selected receiver of said plural receiver population; and generating a first activation code signal subsequent to said coded signals for activating the predetermined alert sequence of said at least one selected receiver.

9. An encoding device for generating sequential code signals containing information which are to be transmitted to a plural population of receivers, each said receiver being capable of establishing more than one time period for address correlation and having predetermined alert sequence, comprising:
means for generating a first set of coded signals for selecting one of at least a first and second time period for said plural population of receivers to correlate for an address;
means for generating a second set of coded signals for selecting at least one selected receiver of said plural receiver population.

10. An encoding device, according to claim 9, further comprising:
means for generating a first activation code signal subsequent to said second set of coded signals for activat-ing the predetermined alert sequence of said at least one selected receiver.

11. An encoding device, according to claim 10, further comprising:
means for generating additional first and second sets of coded signals for at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

12. An encoding device, according to claim 11, wherein:
said means for generating a first set of coded signals generates one of a preamble and an inverted preamble to select one of the first and second time periods, respectively, of said at least one selected receiver.

13. An encoding device for generating sequential code signals containing information which are to be transmitted to a plural population of receivers, each said receiver having a predetermined alert sequence, comprising:
means for generating coded signals for selecting at least one selected receiver of said plural receiver population;
means for generating a first activation code signal subsequent to said coded signals for activating a predeter-mined alert sequence of said at least one selected receiver.

14. An encoding device for generating sequential code signals which are to be transmitted to a plural population of receivers, each said receiver having predetermined alert sequence, comprising:
means for generating a first set of coded signals for selecting at least one selected receiver of said plural receiver population;
means for generating a first activation code signal subsequent to said first set of coded signals for activating the predetermined alert sequence of said at least one selected receiver; and means for generating at least a second set of coded signals for selecting at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver.

15. An encoding device for generating sequential code signals containing information which are to be transmitted to a plural population of receivers, each said receiver capable of selectively establishing more than one time period for address correlation and having a predetermined alert sequence, comprising:
selecting means for storing and selecting the code signals to be transmitted, said code signals including a first set of coded signals to select one of at least a first and second time period for said plural population of receivers to correlate at least one address, a second set of coded signals to address at least one selected receiver of said plural receiver population, and a first activation code signal for activating the predetermined alert sequence of said at least one selected receiver;
transmitter means, connected to said selecting means, for transmitting said selected code signals;
control circuit means, connected to said selecting means and said transmitter means, for enabling said selecting means to generate a selected first set of coded signals to select one of at least a first and second time period for said plural popula-tion of receivers to correlate at least one address, for enabling said selecting means to generate a selected second set of coded signals to address at least one selected receiver of said plural receiver population, for enabling said selecting means to generate a first activation code signal subsequent to said selected second set of coded signals for activating the predetermined alert sequence of said at least one selected receiver, for enabling said selecting means to generate addi-tional selected first and second sets of code signals for at least one other selected receiver, and for enabling said selecting means to generate at least an additional selected second set of coded signals to address at least one selected other receiver of said plural receiver population during the duration of said predetermined alert sequence of said at least one selected receiver, in accordance with said selecting means.

16. An encoding device, according to claim 15, further comprising:
a voice receiving means, connected to said transmitter means and said control circuit means, for receiving and storing a voice message;
said control circuit means for further controlling the sequence of transmission of said voice message and said code signals.

17. An encoding device, according to claim 16, wherein said selecting means further comprises:
a keyboard having selection keys and a page control key;
a keyboard decoder, connected to said keyboard, for decoding signals from said keyboard;
a word file memory, connected to said keyboard decoder and said control circuit means, for storing and generating coded signals in response to said keyboard decoder and said control circuit means; and a shift register means, connected to said word file memory and said control circuit means, for generating serial code signals.

18. An encoding device according to claim 17, wherein said control circuit means, further comprises:
a programmable logic array circuit having a programmable timer for controlling the duration of preselected portions of said code signals and the duration of transmission of said voice message;
a timer, connected to said programmable logic array circuit and said shift register means, for providing a time base thereof; and a switching means, connected to said transmitter means, said voice receiving means, said shift register and said programmable logic array circuit, for switching from the transmission by said transmitter means of said code signals to said voice messages and vice versa.

19. An encoding device, according to claim 15, wherein said selecting means comprises:
a keyboard and keyboard controller; and a visual display device.

20. An encoding device, according to claim 19, wherein said control circuit means further comprises:
processing means for generating the code signals to be transmitted and for controlling the duration of preselected portions of said code signals and the duration of transmission of said voice message;
audio data select means, connected to said processing means, for generating an output indicating which one of said voice message and said code signals should be transmitted;
audio data detection means, connected to said proces-sing means and said transmitter means for generating an out-put indicating that one of said voice signal and said code signal should be transmitted; and switching means, connected to said processing means, said audio data select means, said voice receiving means and said transmitter means, for switching from the trans-mission by said transmitter means of said code signals to said voice messages and vice versa.

21. An encoding device, according to claim 16, wherein said control circuit means further comprises:
processing means for generating the code signals to be transmitted and for controlling the duration of preselected portions of said code signals and the duration of trans-mission of said voice message;
audio data select means, connected to said processing means, for generating an output indicating which one of said voice message and said code signals should be transmitted;
audio data detection means, connected to said processing means and said transmitter means for generating an output indicating that one of said voice signal and said code signal should be transmitted; and switching means, connected to said processing means, said audio data select means, said voice receiving means and said transmitter means, for switching from the transmission by said transmitter means of said code signals to said voice messages and vice versa.