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Simultaneous communication of analog and binary information in a single frame of a pulse count modulated digital signal

  • US 4,346,380 A
  • Filed: 04/15/1980
  • Issued: 08/24/1982
  • Est. Priority Date: 12/11/1978
  • Status: Expired due to Term
First Claim
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1. A communications system for communicating both analog information and binary information in a single frame of a pulse train, comprising:

  • a first number "m" of analog information input channels for providing analog input information, wherein "m" is a positive integer greater than or equal to "one";

    means for sequentially multiplexing and modulating the first given number "m" of analog information input channels to produce a first sequence of "m" analog information pulses in each frame of the pulse train, wherein each analog information pulse respectively has a width that is proportional to the amplitude of the analog information in the respective analog information input channel;

    a second given number "n" of binary information input channels for providing binary input information, wherein "n" is a positive integer greater than "one";

    means for modulating the second given number "n" of binary information input channels to produce a second sequence of binary information pulses in a particular unary code wherein 2n possible states are represented by a number of sequential pulses that are representative of the binary information in the "n" binary information input channels;

    means for multiplexing said second sequence of binary information pulses in each frame of the pulse train sequentially to said first sequence of analog information pulses; and

    means for producing a sync signal that persists for the interval between the second sequence of binary information pulses and the subsequent first sequence of analog information pulses in the next frame.

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