Asynchronous communications system

Patent

Asynchronous communications system

- 06 Aug 1968

8

TL;DR: An asynchronous communication system for mobile and fixed radio communications which includes a plurality of subscriber's stations, a plurality-of-trains and a central station, in which the subscriber's speech and associated audible signals are first modulated into three-level delta modulation pulses, then coded into a frequency-time address assigned to those subscribers, transmitted by radio, received by one of the nearby trunk stations, address decoded first to identify the subscriber, then demodulated to voice band signals, transmitted to the central office having stored program control features, switched in accordance with the dialed

Abstract: An asynchronous communication system for mobile and fixed radio communications which includes a plurality of subscriber''s stations, a plurality of trunk stations and a central station, in which the subscriber''s speech and associated audible signals are first modulated into three-level delta modulation pulses, then coded into a frequency-time address assigned to those subscribers, transmitted by radio, received by one of the nearby trunk stations, address decoded first to identify the subscriber, then demodulated to voice band signals, transmitted to the central office having stored program control features, switched in accordance with the dialed information to establish connection to the other subscriber''s stations, transmitted to another of the trunk stations nearby the other subscriber''s stations, first modulated into three-level delta modulation, then coded into address codes assigned to the other subscriber''s stations, transmitted by radio, received by the other subscriber''s stations by means of address codes, then demodulated into speech and sent to other subscribers.

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Citations

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Crawford E Staples

- 16 Jan 1974

TL;DR: In this paper, a data and voice communication link is provided between a movement direction center, a data processing center, and all mobile work units of a railroad terminal control system, where a work assignment input from the movement direction centre, e.g., an order to assemble a train, activates the data processing centre to prepare and transmit to the selected switching locomotive an itemized work list, which is recorded in printed form at the locomotive to serve as specific instructions for accomplishing the assignment.

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- 21 Mar 1985

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