Digital data transmission system

H - Electricity – 04 – J

Patent

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363/17

H04J 3/06 (2006.01) H04J 3/04 (2006.01) H04L 5/22 (2006.01)

Patent

CA 1160775

Abstract of the Disclosure A digital time multiplex communications system for transmission of a time multiplex signal containing the signal elements of a synchronization channel and of a plurality of communications channels, the signal elements having the same repetition rate in each channel, the signal transmitted by the transmitter being constituted by a succession of time frames composed of equal element intervals each containing a signal element of a respective channel. The system includes a receiver composed of a member for separating the synchron- ization channel signal element from the communications channel signal elements of each frame, an externally triggerable sawtooth voltage generator connected to the separating member to generate a sawtooth voltage sweep in response to the appearance of each synchronization channel signal element, a plurality of comparison stages each associated with a respective communications channel and connected to receive the sawtooth voltage and to produce an output signal when the sawtooth voltage reaches a respective value which differs by a fixed amount from one stage to the next such that the output signal from each stage occurs at a time corresponding to the appearance of a signal element of its associated communications channel, and a plurality of signal storage members each associated with a respective communications channel and each connected to the separating member and to the output of the comparison stage associated with the same communications channel for providing a signal sequence corres- ponding to the signal elements of a respective communications channel of the transmitted time multiplex signal.

391035

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