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Alarm communications system with independent supervision signal analysis

  • US 5,748,079 A
  • Filed: 07/24/1996
  • Issued: 05/05/1998
  • Est. Priority Date: 05/20/1996
  • Status: Expired due to Term
First Claim
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1. In a communications system comprising a plurality of remote transmitting devices and a receiving station having a receiver associated therewith, each of said remote transmitting devices capable of transmitting a supervision signal and a non-supervision signal, a method for automatically testing the communications system comprising the steps of:

  • a) receiving at said receiving station a signal from a transmitting device;

    b) processing said received signal at a first sensitivity level and providing a first output signal representative thereof;

    c) processing said received signal at a second sensitivity level and providing a second output signal representative thereof, said second sensitivity level being lower in magnitude than said first sensitivity level;

    d) determining if said received signal is a supervision signal or a non-supervision signal by analyzing said first output signal;

    e) when said received signal is determined to be a supervision signal, then performing the steps of;

    i) determining if said second output signal is correlated to said first output signal;

    ii) subsequently processing said first output signal as being part of a validly received supervision signal when said second output signal is determined to be correlated to said first output signal; and

    iii) not subsequently processing said first output signal as being part of a validly received supervision signal when said second output signal is determined to be uncorrelated to said first output signal; and

    f) when said received signal is determined to be a non-supervision signal, then subsequently processing said first output signal as being art of a validly received non-supervision signal.

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