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Fail-safe cab signal process for transmitting information by high-voltage pulsed track circuits, and apparatus for carrying the process into effect

  • US 4,081,160 A
  • Filed: 09/28/1976
  • Issued: 03/28/1978
  • Est. Priority Date: 10/01/1975
  • Status: Expired due to Term
First Claim
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1. A method for communicating information comprising a plurality of data items to a rail vehicle by transmission of pulses at predetermined repetition rates along railway tracks comprising the steps of:

  • a) encoding each of said data items as pulses occurring at a selected repetition rate;

    b) transmitting said pulses at said selected repetition rate along said tracks;

    c) receiving said pulses;

    d) removing interference signals from said pulses, said interference signals attributable to a number of causes, which include;

    i) unbalanced traction return currents, and/orii) transmission interferences;

    e) regenerating said received pulses;

    f) determining the repetition rate of said received pulses;

    g) decoding information from said determined repetition rate, andh) indicating the decoded information in said rail vehicle.

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