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Electronic polling and calling communication system

  • US 4,088,983 A
  • Filed: 10/28/1975
  • Issued: 05/09/1978
  • Est. Priority Date: 10/28/1975
  • Status: Expired due to Term
First Claim
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1. For electronic communication between a central station which transmits a communication signal train consisting of a series of N + 1 sequential uniform-amplitude square wave pulses, each of said N pulses representing a different remote station and being of short duration for an unselected remote station and being of intermediate duration for a selected remote station and the additional synch pulse being of long duration:

  • means at each remote station for receiving the transmitted signal train and for producing a pulse signal on a first signal line (C pulses) for each received short duration pulse or greater and a pulse signal on a second signal line (R pulses) for each received synch pulse;

    sequencer circuit means having N + 1 stages and an output signal line for each stage;

    means for feeding said pulses from said first signal line into said sequencer for advancing the signal state of the sequencer from stage to stage in sequence for each received C pulse; and

    means for combining the signal on the output signal line of a selected one of the sequencer stages with a third signal line to produce signal output upon concurrent appearance of a signal from the selected sequencer stage and on said third signal line.

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