TDM communication system for efficient spectrum utilization

Claim 2

In a time division multiplex communication system which apportions radio frequency communications channels into at least two time slots for communicating voice signals vo-coded at a predetermined rate, V, a transceiving device comprising: means for providing a clock signal having a frequency at least twice that of the vo-coding rate; means for receiving a vo-coded signal from a communication channel having a predetermined maximum data rate, C, during at least one time slot in accordance with a time division multiplex protocol defining N time slots, where N is a positive integer less than or equal to C/V, at a rate approximately equal to said clock signal to provide a received signal, said receiving means including means for synchronizing the device to said received signal; means for buffering said received signal to provide a buffered signal; means for transmitting said buffered signal onto said communication channel during at least one of said N time slots at a rate approximately equal to said clock signal, said transmitting means including means for generating and preambling a data signal which includes at least a synchronization signal to said buffered signal; means for controlling the device whereby the device operates as a single frequency repeater.

Claim 3

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals vo-coded at a predetermined rate, V, a transceiving device comprising: means for providing a clock signal having a frequency at least twice that of the vo-coding rate; means for receiving a vo-coded signal from a first communication channel having a predetermined maximum data rate, C, during at least one time slot in accordance with a time division multiplex protocol defining N time slots, where N is a positive integer less than or equal to C/V, at a rate approximately equal to said clock signal to provide a received signal, said receiving means including means for synchronizing the device to said received signal; means for transmitting said received signal onto a second communication channel also having said predetermined maximum data rate, C, during at least one time slot in accordane with said time division multiplexed protocol defining said N time slots, at a rate approximately equal to said clock signal, said trasmitting means including means for generating and preambling a data signal which includes at least a synchronization signal to said received signal; means for controlling the device whereby the device operates as a time division multiplex repeater.

Claim 4

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals vo-coded at a predetermined rate, V, a transceiving device comprising: means for providing a clock signal having a frequency at least twice that of the vo-coding rate; means for receiving a vo-coded signal from a first communication channel having a predetermined maximum data rate, C, during at least one time slot in accordance with a time division multiplex protocol defining N time slots, where N is a positive integer less than or equal to C/V, at a rate approximately equal to said clock signal to provide a received signal, said receiving means including means for synchronizing the device to said received signal; means for transmitting said received signal onto a second communication channel also having said predetermined maximum data rate, C, during at least one time slot in accordane with said time division multiplexed protocol defining said N time slots, at a rate approximately equal to said clock signal, said trasmitting means including means for generating and preambling a data signal which includes at least a synchronization signal to said received signal; means for controlling the device whereby the device operates as a time division multiplex repeater.

Claim 5

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals, an improved transceiving device comprising: means for receiving a vo-coded signal from a communication channel having predetermined maximum data rate, C, during at least one time slot in accordance with a time division multiplex protocol defining N time slots, where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, at a rate approximately equal to twice said selected coding rate to provide a received signal, said receiving means including means for synchronizing the device to said received signal; means for analyzing a voice signal at said selected coding rate to provide a vo-coded signal; means for generating and preambling a data signal which includes at least a synchronization signal to said vo-coded signal; first and second buffering means for buffering respectively said recevied signal at approximately twice said selected coding rate, and said vo-coded signal at said selected coding rate; means for transmitting said buffered vo-coded signal onto said communication channel during at least one of said N time slots at a rate approximately equal to twice said selected coding rate; means for synthesizing a recovered voice signal from said buffered received signal at a rate approximately equal to said selected coding rate; and means for controlling the time division multiplex transceiving device, whereby the device operates in a first mode to repeat said vo-coded signal received during said first time slot during said second time slot, and operates in a second mode to simulate full duplex operation on a single communication channel.

Claim 6

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals, an improved transceiving device comprising: means for receiving a vo-coded signal from a communication channel having predetermined maximum data rate, C, during at least one time slot in accordance with a time division multiplex protocol defining N time slots, where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, at a rate approximately equal to twice said selected coding rate to provide a received signal, said receiving means including means for synchronizing the device to said received signal; means for analyzing a voice signal at said selected coding rate to provide a vo-coded signal; means for generating and preambling a data signal which includes at least a synchronization signal to said vo-coded signal; first and second buffering means for buffering respectively said recevied signal at approximately twice said selected coding rate, and said vo-coded signal at said selected coding rate; means for transmitting said buffered vo-coded signal onto said communication channel during at least one of said N time slots at a rate approximately equal to twice said selected coding rate; means for synthesizing a recovered voice signal from said buffered received signal at a rate approximately equal to said selected coding rate; and means for controlling the time division multiplex transceiving device, whereby the device operates in a first mode to repeat said vo-coded signal received during said first time slot during said second time slot, and operates in a second mode to simulate full duplex operation on a single communication channel.

Claim 7

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals, a transceiving device comprising: means for transmitting a vo-coded signal onto a communication channel having a predetermined maximum data rate, C, in accordance with a time division multiplex protocol defining N time slots where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, said vo-coded signal being temporarily buffered at a first rate and transmitted at a rate exceeding 2 V during at least one of said N time slots, said transmitting means including means for analyzing a voice signal at said selected coding rate, V, to provide said vo-coded signal, and means for generating and preambling a data signal, which includes at least a synchronization signal to said vo-coded signal; means for receiving and buffering a vo-coded signal from the communication channel in accordance with said time division multiplex protocol during at least one of said N time slots to provide a received signal, said receiving means including means for synchronizing to at least a portion of said synchronization signal, and means for processing said received signal at said selected coding rate, V, to synthesize a recovered voice signal from said received signal; and means for intercoupling and controlling said transmitting means and said receiving means such that the device operates to repeat said received signal received in at least one of said N time slots during at least one other time slot thereby providing a single frequency repeater.

Claim 8

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals, a transceiving device comprising: means for transmitting a vo-coded signal onto a communication channel having a predetermined maximum data rate, C, in accordance with a time division multiplex protocol defining N time slots where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, said vo-coded signal being temporarily buffered at a first rate and transmitted at a rate exceeding 2 V during at least one of said N time slots, said transmitting means including means for analyzing a voice signal at said selected coding rate, V, to provide said vo-coded signal, and means for generating and preambling a data signal, which includes at least a synchronization signal to said vo-coded signal; means for receiving and buffering a vo-coded signal from the communication channel in accordance with said time division multiplex protocol during at least one of said N time slots to provide a received signal, said receiving means including means for synchronizing to at least a portion of said synchronization signal, and means for processing said received signal at said selected coding rate, V, to synthesize a recovered voice signal from said received signal; and means for intercoupling and controlling said transmitting means and said receiving means such that the device operates to repeat said received signal received in at least one of said N time slots during at least one other time slot thereby providing a single frequency repeater.

Claim 9

The device of claim 4, wherein the frequency of said selected coding rate comprises 4.8 kHz.

Claim 10

The device of claim 4, wherein the frequency of said selected coding rate comprises 2.4 kHz.

Claim 11

The device of claim 4, wherein said analyzing means comprises an LPC analyzer.

Claim 12

The device of claim 4, wherein said analyzing means comprises a SBC analyzer.

Claim 13

The device of claim 4, wherein said processing means comprises an LPC synthesizer.

Claim 14

The device of claim 4, wherein said processing means comprises a SBC synthesizer.

Claim 15

The device of claim 4, wherein said transmitting and receiving means are constructed and arranged to operate on a communication channel having a 25 kHz bandwidth.

Claim 16

In a time division multiplex communication system which apportions radio frequency communication channels into at least two times slots for communicating voice signals, a transceiving device comprising: means for transmitting a vo-coded signal onto a communication channel having a predetermined maximum data rate, C, in accordance with a time division multiplex protocol defining N time slots where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, said vo-coded signal being temporarily buffered at a first rate and transmitted at a rate exceeding 2 V during at least one of said N time slots, said transmitting means including means for analyzing a voice signal at said selected coding rate, V, to provide said vo-coded signal, and means for genrating said preambling a data signal, which includes at least a synchronization signal to said vo-coded signal; means for receiving and buffering a vo-coded signal from the communication channel in accordance with said time division multiplex protocol during at least one of said N time slots to provide a received signal, said receiving means including means for synchronizing to at least a portion of said synchronization signal, and means for processing said received signal at said selected coding rate, V, to synthesize a recoverd voice signal from said received signal; and means for duplexing said transmitting means and said receiving means such that the device operates to repeat said received signal received from at least one of said N time slots on a first frequency in at least one of said N time slots on a second frequency.

Claim 17

In a time division multiplex communication system which apportions radio frequency communication channels into at least two times slots for communicating voice signals, a transceiving device comprising: means for transmitting a vo-coded signal onto a communication channel having a predetermined maximum data rate, C, in accordance with a time division multiplex protocol defining N time slots where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, said vo-coded signal being temporarily buffered at a first rate and transmitted at a rate exceeding 2 V during at least one of said N time slots, said transmitting means including means for analyzing a voice signal at said selected coding rate, V, to provide said vo-coded signal, and means for genrating said preambling a data signal, which includes at least a synchronization signal to said vo-coded signal; means for receiving and buffering a vo-coded signal from the communication channel in accordance with said time division multiplex protocol during at least one of said N time slots to provide a received signal, said receiving means including means for synchronizing to at least a portion of said synchronization signal, and means for processing said received signal at said selected coding rate, V, to synthesize a recoverd voice signal from said received signal; and means for duplexing said transmitting means and said receiving means such that the device operates to repeat said received signal received from at least one of said N time slots on a first frequency in at least one of said N time slots on a second frequency.

Claim 18

The device of claim 12, wherein the frequency of said selected coding rate comprises 4.8 kHz.

Claim 19

The device of claim 12, wherein the frequency of said selected coding rate comprises 2.4 KHz.

Claim 20

The device of claim 12, wherein said analyzing means comprises an LPC analyzer.

Claim 21

The device of claim 12, wherein said analyzing means comprises an SBC analyzer.

Claim 22

The device of claim 12, wherein said processing means comprises an LPC synthesizer.

Claim 23

The device of claim 12, wherein said processing means comprises an SBC synthesizer.

Claim 24

The device of claim 12, wherein said transmitting and said receiving means are constructed and arranged to operate on a communication channel having a 25 kHz bandwidth.

Claim 25

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals, a transceiving device comprising: means for transmitting a vo-coded signal onto a communication channel having a predetermined maximum data rate, C, in accordance with a time division multiplex protocol defining N time slots where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, said vo-coded signal being temporarily buffered at a first rate and transmitted at a rate exceeding 2 V during at least one of said N time slots, said transmitting means including means for analyzing a voice signal at said selected coding rate, V, to provide said vo-coded signal, and means for generating and preambling a data signal, whih includes at least a synchronization signal to said vo-coded signal; means for receiving and buffering a vo-coded signal from the communication channel in accordance with said time division multiplex protocol during at least one of said N time slots to provide a received signal, said receiving means including means for synchronizing to at least a portion of said synchronization signal, and means for processing said received signal at said selected coding rate, V, to synthesize a recovered voice signal from said received signal; and means for controlling and selectively intercoupling said transmitting means and said receiving means, such that the device operates in a first mode to repeat said received signal received in at least one of said N time slots during at least one other time slot, and operates in a second mode to simulate full duplex communication on a single channel.

Claim 26

In a time division multiplex communication system which apportions radio frequency communication channels into at least two time slots for communicating voice signals, a transceiving device comprising: means for transmitting a vo-coded signal onto a communication channel having a predetermined maximum data rate, C, in accordance with a time division multiplex protocol defining N time slots where N is a positive integer less than or equal to C/V, where V comprises a selected coding rate, said vo-coded signal being temporarily buffered at a first rate and transmitted at a rate exceeding 2 V during at least one of said N time slots, said transmitting means including means for analyzing a voice signal at said selected coding rate, V, to provide said vo-coded signal, and means for generating and preambling a data signal, whih includes at least a synchronization signal to said vo-coded signal; means for receiving and buffering a vo-coded signal from the communication channel in accordance with said time division multiplex protocol during at least one of said N time slots to provide a received signal, said receiving means including means for synchronizing to at least a portion of said synchronization signal, and means for processing said received signal at said selected coding rate, V, to synthesize a recovered voice signal from said received signal; and means for controlling and selectively intercoupling said transmitting means and said receiving means, such that the device operates in a first mode to repeat said received signal received in at least one of said N time slots during at least one other time slot, and operates in a second mode to simulate full duplex communication on a single channel.

Claim 27

The device of claim 20, wherein the frequency of said selected coding rate comprises 4.8 kHz.

Claim 28

The device of claim 20, wherein the frequency of said selected coding rate comprises 2.4 kHz.

Claim 29

The device of claim 20, wherein said analyzing means comprises an LPC analyzer.

Claim 30

The device of claim 20, wherein said analyzing means comprises an SBC analyzer.

Claim 31

The device of claim 20, wherein said processing means comprises an LPC synthesizer.

Claim 32

The device of claim 20, wherein said processing means comprises an SBC synthesizer.

Claim 33

The device of claim 20, wherein said transmitting and said receiving means are constructed and arranged to operate on a communication channel having a 25 kHz bandwidth.