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Synchronous data channel for pulse code modulation communications system

  • US 3,886,317 A
  • Filed: 12/17/1973
  • Issued: 05/27/1975
  • Est. Priority Date: 12/17/1973
  • Status: Expired due to Term
First Claim
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1. A pulse code modulation (PCM) communications system for transmitting information from a plurality of channels such system including a framing bit some of said channels being for transmission of voice type data but at least one channel being exclusively for synchronous digital input data from a single external source of data the repetition rate of transmitted pulses being a predetermined clock frequency said system including a channel counter generator for determining said plurality of channels comprising:

  • clock generator means for receiving said clock frequency and for deriving therefrom a signal for timing said synchronous digital data input said clock generator means being responsive to said framing bit for removing at least one bit from said clock frequency for deriving said timing signal;

    means for connecting said clock generator means to said external source of data to couple said timing signal to said source of data for providing synchronous operation;

    storage register means for storing said digital data; and

    gating means responsive to the channel counter generator counting to said one channel for transferring said stored data to a PCM transmit bus.

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