High speed selective calling communication system having low drain receiver

Claim 2

A selective calling communication system comprising a transmitter including means for generating a multiplicity of code signals each having a cue tone and at least one control tone, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups; and a receiver including a processing circuit for processing the code signals, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, said pulser circuit means having an input coupled to said first output and responsive to the application thereto of said first control signal to furnish a continuous supply voltage to said processing circuit, a utilization circuit having an input coupled to said second output and responsive to the second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 3

The selective calling communication system set forth in claim 1, wherein each code signal includes a plurality of control tones.

Claim 4

The selective calling communication system set forth in claim 1, wherein the cue tone of each code signal is transmittEd prior to the control tone thereof.

Claim 5

The selective calling communication system set forth in claim 1, wherein each code signal includes a plurality of control tones sequentially transmitted.

Claim 6

The selective calling communication system set forth in claim 1, wherein the cue tone of the first code signal of each signal group is substantially longer in duration than the cue tone of the rest of the code signals of each signal group.

Claim 7

A selective calling communication system comprising a transmitter including means for generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups; and a receiver including a processing circuit for processing the code signals, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, said pulses being spaced from each other by an amount no greater than said predetermined duration, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined cue tone for at least said predetermined time interval, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, a utilization circuit having an input coupled to said second output and responsive to the second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 8

A selective calling communication system comprising a transmitter including means for generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups; and a receiver including a processing circuit for processing the code signals, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, said pulses being spaced from each other by an amount no greater than said predetermined duration, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined cue tone for at least said predetermined time interval, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, a utilization circuit having an input coupled to said second output and responsive to the second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 9

A selective calling communication system comprising a transmitter including means for generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups; and a receiver including a processing circuit for processing the code signals, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, said pulses being spaced from each other by an amount no greater than said predetermiNed duration, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined cue tone for at least said predetermined time interval, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, electronic switching means coupled to said second output and responsive to said second control signal to provide an enabling signal, a utilization circuit having an input coupled to said switching means and responsive to the enabling signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 10

A selective calling communication system comprising a transmitter including means for generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups; and a receiver including a processing circuit for processing the code signals, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, said pulses being spaced from each other by an amount no greater than said predetermiNed duration, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined cue tone for at least said predetermined time interval, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, electronic switching means coupled to said second output and responsive to said second control signal to provide an enabling signal, a utilization circuit having an input coupled to said switching means and responsive to the enabling signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 11

The selective calling communication system set forth in claim 7, wherein the predetermined duration of the first cue tone in each signal group is at least 30 times the duration of the rest of the cue tones in each signal group.

Claim 12

The selective calling communication system set forth in claim 7, wherein the predetermined duration of the first cue tone of the first code signal in each signal group is at least 30 times the duration of the rest of the control tones of the first code signal in each signal group.

Claim 13

The selective calling communication system set forth in claim 7, wherein the cue tones and the control tones in the second code signal and in all succeeding code signals in each group are of the same order of magnitude.

Claim 14

The selective calling communication system set forth in claim 7, wherein the predetermined duration of the first cue tone in each signal group is at least one second in duration.

Claim 15

The selective calling communication system set forth in claim 7, wherein the second tone in each signal group and each succeeding tone therein have durations no greater than about 50 milliseconds.

Claim 16

The selective calling communication system set forth in claim 7, wherein the second tone in each signal group and each succeeding tone therein and the gap between succeeding code signals have durations no greater than 50 milliseconds.

Claim 17

The selective calling communication system set forth in claim 7, wherein the duty cycle of said pulser circuit means in the absence of said control signals is no greater than about 5 percent.

Claim 18

A selective calling communication system comprising a transmitter including means for sequentially generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, and means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all those code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for modulating the code signals onto a carrier wave; and a receiver including a processing circuit for receiving the modulated carrier wave and detecting the code signals therein, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, said pulses being spaced from each other by an aMount no greater than said predetermined duration, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined cue tone for at least said predetermined time interval, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, a utilization circuit having an input coupled to said second output and responsive to the second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 19

A selective calling communication system comprising a transmitter including means for sequentially generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, and means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all those code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for modulating the code signals onto a carrier wave; and a receiver including a processing circuit for receiving the modulated carrier wave and detecting the code signals therein, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, said pulses being spaced from each other by an aMount no greater than said predetermined duration, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined cue tone for at least said predetermined time interval, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, a utilization circuit having an input coupled to said second output and responsive to the second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 20

A selective calling communication transmitter comprising means for generating a multiplicity of code signals each having a cue tone and at least one control tone, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all those code signals which include the corresponding cue tone of that group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups.

Claim 21

A selective calling communication transmitter comprising means for generating a multiplicity of code signals each having a cue tone and at least one control tone, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all those code signals which include the corresponding cue tone of that group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups.

Claim 22

The selective calling communication system set forth in claim 16, wherein each code signal includes a plurality of control tones.

Claim 23

The selective calling communication system set forth in claim 16, wherein the cue tone of each code signal is transmitted prior to the control tone thereof.

Claim 24

The selective calling communication system set forth in claim 16, wherein each code signal includes a plurality of control tones sequentially transmitted.

Claim 25

The selective calling communication system set forth in claim 16, wherein the cue tone of the first code signal of each signal group is substantially longer in duration than the cue tone of the rest of the code signals of each signal group.

Claim 26

A selective calling communication transmitter comprising means for generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups.

Claim 27

A selective calling communication transmitter comprising means for generating a multiplicity of code signals each having a cue tone and a sequence of a predetermined number of control tones, means for arranging the code signals into a plurality of signal groups for sequential transmission thereof, the number of signal groups corresponding to the number of cue tone frequencies, each signal group containing all these code signals which include the corresponding cue tone of that group, the commencement of one cue tone being separated from the termination of the preceding cue tone by a predetermined time interval, the cue tone of the first code signal in each group having a predetermined duration that is substantially greater than the duration of the cue tone of the rest of the code signals in each group, and means for sequentially transmitting the code signals in accordance with the arrangement thereof into said signal groups.

Claim 28

The selective calling communication system set forth in claim 21, wherein the predetermined duration of the first cue tone in each signal group is at least 30 times the duration of the rest of the cue tones in each signal group.

Claim 29

The selective calling communication system set forth in claim 21, wherein the predetermined duration of the first cue tone of the first code signal in each signal group is at least 30 times the duration of the rest of the control tones of the first code signal in each signal group.

Claim 30

The selective calling communication system set forth in claim 21, wherein the cue tones and the control tones in the second code signal and in all succeeding cOde signals in each group are of the same order of magnitude.

Claim 31

The selective calling communication system set forth in claim 21, wherein the predetermined duration of the first cue tone in each signal group is at least one second in duration.

Claim 32

The selective calling communication system set forth in claim 21, wherein the second tone in each signal group and each succeeding tone therein have durations no greater than about 50 milliseconds.

Claim 33

The selective calling communication system set forth in claim 21, wherein the second tone in each signal group and each succeeding tone therein and the gap between succeeding code signals have durations no greater than 50 milliseconds.

Claim 34

The selective calling communication system set forth in claim 21, wherein the duty cycle of said pulser circuit means in the absence of said control signals is no greater than about 5 percent.

Claim 35

A selective calling communication generator comprising input means for receiving a multiplicity of sets of coded instructions respectively corresponding to a multiplicity of code signals each having one cue tone and at least one control tone, means for arranging the sets of coded instructions into a plurality of groups respectively corresponding in number to the number of cue tone frequencies, each group continuing all those sets of coded instructions corresponding to the code signal which include the corresponding cue tone of that group, oscillator means for generating code signals in response to the sets of coded instructions, means for sequentially applying to said oscillator means all of the sets of coded instructions in one group followed by successively releasing all of the sets of coded instructions in each succeeding group, thereby sequentially to generate signal groups respectively containing all those code signals which include the corresponding cue tone of the associated signal group.

Claim 36

A selective calling communication generator comprising input means for receiving a multiplicity of sets of coded instructions respectively corresponding to a multiplicity of code signals each having one cue tone and at least one control tone, means for arranging the sets of coded instructions into a plurality of groups respectively corresponding in number to the number of cue tone frequencies, each group continuing all those sets of coded instructions corresponding to the code signal which include the corresponding cue tone of that group, oscillator means for generating code signals in response to the sets of coded instructions, means for sequentially applying to said oscillator means all of the sets of coded instructions in one group followed by successively releasing all of the sets of coded instructions in each succeeding group, thereby sequentially to generate signal groups respectively containing all those code signals which include the corresponding cue tone of the associated signal group.

Claim 37

A selective calling communication receiver for receiving carrier waves modulated by a code signal including a cue tone and sequence of a predetermined number of control tones, said receiver comprising a processing circuit for processing the modulated carrier wave and detecting the code signal therein, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined tone for a predetermined time interval following termination of the code signal, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, a utilization circuit having an input coupled to said second output and responsive to said second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.

Claim 38

A selective calling communication receiver for receiving carrier waves modulated by a code signal including a cue tone and sequence of a predetermined number of control tones, said receiver comprising a processing circuit for processing the modulated carrier wave and detecting the code signal therein, pulser circuit means coupled to said processing circuit for producing a series of pulses intermittently to render said processing circuit operative, decoding means coupled to said processing circuit and having first and second outputs, said decoding means being responsive to a predetermined cue tone for generating at said first output a first control signal and responsive to a predetermined code signal for generating at said second output a second control signal, timing means coupled to said first output for providing an extended control signal persisting beyond termination of said predetermined tone for a predetermined time interval following termination of the code signal, said pulser circuit means having an input coupled to the output of said timing means and responsive to the application thereto of said extended control signal to furnish a continuous supply voltage to said processing circuit at least until termination of said predetermined time interval, a utilization circuit having an input coupled to said second output and responsive to said second control signal to provide an output signal, and an annunciator coupled to said utilization circuit for converting the output signal into usable form.