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Method and apparatus for detecting a hazard detector signal in the presence of interference

  • US 10,121,352 B2
  • Filed: 11/16/2017
  • Issued: 11/06/2018
  • Est. Priority Date: 08/02/2016
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a pattern warning signal from a hazard detector in the presence of a second pattern warning signal from a second hazard detector, comprising:

  • a transducer for converting the pattern warning signal and the second pattern warning signal to a composite electronic signal, each of the first and second pattern warning signals comprising an on-time period followed by an off-time period;

    an analog-to-digital converter for converting the composite electronic signal into a digital signal;

    a memory for storing processor-executable instructions and one or more thresholds;

    a transmitter for transmitting an alarm signal; and

    a processor coupled to the analog-to-digital converter, the memory and the transmitter for executing the processor-executable instructions that causes the apparatus to;

    determine an on-time duration of the digital signal as a time that the digital signal exceeded a first voltage threshold stored in the memory; and

    transmit an alarm signal to a receiver when the pattern warning signal has been determined to be present, based on the on-time duration.

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