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

The present disclosure describes methods and 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. In one embodiment, hazard detector monitoring device converts a pattern warning signal and a second p...

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Bibliographische Detailangaben
1. Verfasser: George Seelman
Format: Patent
Sprache:eng
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Zusammenfassung:The present disclosure describes methods and 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. In one embodiment, hazard detector monitoring device converts a pattern warning signal and a second pattern warning signal into a composite electronic signal, each of the first and second pattern warning signals comprising an on-time period followed by an off-time period. Next, the composite electronic signal is converted into a digital signal and then an on-time duration of the digital signal is determined as a time that the digital signal exceeded a first voltage threshold. Finally, an alarm signal is transmitted to a receiver when the pattern warning signal has been determined to be present, based on the on-time duration.