Start-stop communication system for use in space reservation and the like

Claim 1

A SYSTEM FOR TRANSMITTING INFORMATION FROM A PLURALITY OF SEPARATE TRANSMITTERS OVER TRANSMISSION CHANNELS TO A CENTRAL RECEIVER COMPRISING MEANS IN EACH TRANSMITTER TO PRODUCE AUTOMATICALLY IN TIMED SEQUENCE A START PULSE, A GROUP OF ADDRESS PULSES IDENTIFYING THE TRANSMITTER, AND A GROUP OF INFORMATION PULSES, THE CENTRAL RECEIVER COMPRISING A NUMBER OF INFORMATION STORES EQUAL TO THE NUMBER OF TRANSMITTERS, EACH INFORMATION STORE BEING IDENTIFIED WITH ONE TRANSMITTER, MEANS RESPONSIVE TO THE START PULSE FROM A TRANSMITTER TO CAUSE THE RECEIVER TO COMMENCE OPERATION, MEANS RESPONSIVE TO THE ADDRESS PULSES TO SELECT THE INFORMATION STORE IDENTIFIED WITH THE TRANSMITTER, AND MEANS TO ROUTE THE INFORMATION PULSES TO THE SELECTED INFORMATION STORE, EACH TRANSMITTER ALSO COMPRISING MEANS TO REDUCE THE DURATION OF EACH ADDRESS AND INFORMATION PULSE SO THAT IT IS APPRECIABLY LESS THAN THE TIME PERIOD ALLOCATED FOR THE PULSE, THE PULSE BEING TRANSMITTED IN THE CENTRE OF SAID TIME PERIOD, WHEREBY A MISMATCH IN THE FREQUENCY OF OSCILLATORS IN ANY TRANSMITTER AND IN SAID RECEIVER WILL NOT RESULT IN ANY LOSS OF INFORMATION, SAID PULSES BEING PRODUCED IN EACH TRANSMITTER BY A TRANSMITTER ASTABLE MULTIVIBRATOR, EACH CYCLE OF THE MULTIVIBRATOR SQUARE WAVE DEFINING ONE HALF OF A TIME PERIOD, A SERIES OF TRANSMITTER BISTABLE DIVIDER CIRCUITS CONNECTED IN CASCADE, THE FIRST DIVIDER CIRCUIT BEING ACTUAATED BY SAID MULTIVIBRATOR, A SERIES OF TRANSMITTER NOR CIRCUITS EQUAL TO THE NUMBER OF TIME PERIODS REQUIRED FOR THE TRANSMISSION SEQUENCE, AND INTERCONNCTIONS BETWEEN SAID DIVIDER CIRCUITS AND SAID NOR CIRCUITS WHEREBY SAID NOR CIRCUITS PRODUCE PULSES IN PROGRESSIVE ORDER IN SAID SUCCESSIVE TIME PERIODS, EACH TRANSMITTER FURTHER COMPRISING A MODULATOR, A SINE WAVE OSCILLATOR CONNECTED TO SAID MODULATOR, A FIRST PLURALITY OF KEYS ASSOCIATED TO SAID FIRST PLURALITY OF SAID TRANSMITTER NOT CIRCUITS, SAID KEYS BEING PERMANENTLY SET TO STATES CORRESPONDING WITH THE ADDRESS OF THE TRANSMITER, SAID FIRST PLURALITY OF KEYS WHEN CLOSED ALLOWING PULSES PRODUCED BY SAID FIRST PLURALITY OF SAID TRANSMITTER NOR CIRCUITS TO PASS TO A COMMON LINE, AND A SECOND PLURALITY OF KEYS ASSOCIATED WITH A SECOND PLURALITY OF SAID TRANSMITTER NOR CIRCUITS, SAID SECOND PLURALITY OF KEYS BEING SET PRIOR TO A TRANSMISSION ACCORDING TO THE INFORMATION TO BE TRANSMITTED AT THE SUBSEQUENT TRANSMISSION, THE KEYS OF SAID SECOND PLURALITY ALLOWING PULSES PRODUCED BY SAID SECOND PLURALITY OF NOR CIRCUITS TO PASS TO SAID COMMON LINE, SAID COMMON LINE BEING CONNECTED TO SAID MODULATOR, WHEREBY A BURST OF SINUSOIDAL SIGNALS OF UNIFORM AMPLITUDE APPEARS AT THE OUTPUT OF SAID MODULATOR DURING THE PERIOD OF EACH PULSE APPLIED THERETO FROM SAID COMMON LINE.

Claim 2

A SYSTEM FOR TRANSMITTING INFORMATION FROM A PLURALITY OF SEPARATE TRANSMITTERS OVER TRANSMISSION CHANNELS TO A CENTRAL RECEIVER COMPRISING MEANS IN EACH TRANSMITTER TO PRODUCE AUTOMATICALLY IN TIMED SEQUENCE A START PULSE, A GROUP OF ADDRESS PULSES IDENTIFYING THE TRANSMITTER, AND A GROUP OF INFORMATION PULSES, THE CENTRAL RECEIVER COMPRISING A NUMBER OF INFORMATION STORES EQUAL TO THE NUMBER OF TRANSMITTERS, EACH INFORMATION STORE BEING IDENTIFIED WITH ONE TRANSMITTER, MEANS RESPONSIVE TO THE START PULSE FROM A TRANSMITTER TO CAUSE THE RECEIVER TO COMMENCE OPERATION, MEANS RESPONSIVE TO THE ADDRESS PULSES TO SELECT THE INFORMATION STORE IDENTIFIED WITH THE TRANSMITTER, AND MEANS TO ROUTE THE INFORMATION PULSES TO THE SELECTED INFORMATION STORE, EACH TRANSMITTER ALSO COMPRISING MEANS TO REDUCE THE DURATION OF EACH ADDRESS AND INFORMATION PULSE SO THAT IT IS APPRECIABLY LESS THAN THE TIME PERIOD ALLOCATED FOR THE PULSE, THE PULSE BEING TRANSMITTED IN THE CENTRE OF SAID TIME PERIOD, WHEREBY A MISMATCH IN THE FREQUENCY OF OSCILLATORS IN ANY TRANSMITTER AND IN SAID RECEIVER WILL NOT RESULT IN ANY LOSS OF INFORMATION, SAID PULSES BEING PRODUCED IN EACH TRANSMITTER BY A TRANSMITTER ASTABLE MULTIVIBRATOR, EACH CYCLE OF THE MULTIVIBRATOR SQUARE WAVE DEFINING ONE HALF OF A TIME PERIOD, A SERIES OF TRANSMITTER BISTABLE DIVIDER CIRCUITS CONNECTED IN CASCADE, THE FIRST DIVIDER CIRCUIT BEING ACTUAATED BY SAID MULTIVIBRATOR, A SERIES OF TRANSMITTER NOR CIRCUITS EQUAL TO THE NUMBER OF TIME PERIODS REQUIRED FOR THE TRANSMISSION SEQUENCE, AND INTERCONNCTIONS BETWEEN SAID DIVIDER CIRCUITS AND SAID NOR CIRCUITS WHEREBY SAID NOR CIRCUITS PRODUCE PULSES IN PROGRESSIVE ORDER IN SAID SUCCESSIVE TIME PERIODS, EACH TRANSMITTER FURTHER COMPRISING A MODULATOR, A SINE WAVE OSCILLATOR CONNECTED TO SAID MODULATOR, A FIRST PLURALITY OF KEYS ASSOCIATED TO SAID FIRST PLURALITY OF SAID TRANSMITTER NOT CIRCUITS, SAID KEYS BEING PERMANENTLY SET TO STATES CORRESPONDING WITH THE ADDRESS OF THE TRANSMITER, SAID FIRST PLURALITY OF KEYS WHEN CLOSED ALLOWING PULSES PRODUCED BY SAID FIRST PLURALITY OF SAID TRANSMITTER NOR CIRCUITS TO PASS TO A COMMON LINE, AND A SECOND PLURALITY OF KEYS ASSOCIATED WITH A SECOND PLURALITY OF SAID TRANSMITTER NOR CIRCUITS, SAID SECOND PLURALITY OF KEYS BEING SET PRIOR TO A TRANSMISSION ACCORDING TO THE INFORMATION TO BE TRANSMITTED AT THE SUBSEQUENT TRANSMISSION, THE KEYS OF SAID SECOND PLURALITY ALLOWING PULSES PRODUCED BY SAID SECOND PLURALITY OF NOR CIRCUITS TO PASS TO SAID COMMON LINE, SAID COMMON LINE BEING CONNECTED TO SAID MODULATOR, WHEREBY A BURST OF SINUSOIDAL SIGNALS OF UNIFORM AMPLITUDE APPEARS AT THE OUTPUT OF SAID MODULATOR DURING THE PERIOD OF EACH PULSE APPLIED THERETO FROM SAID COMMON LINE.