Acoustic alarm detector
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United States of America Patent
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Nov 28, 2017
Grant Date -
Jan 12, 2017
app pub date -
Jul 7, 2016
filing date -
Jul 9, 2015
priority date (Note) -
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Abstract
An audible alarm detector constituted of: a microphone generating an electronic signal from an audible signal; a phase locked loop locking onto a frequency component present in the generated electronic signal to output a demodulated signal; and a pattern detector for comparing the demodulated signal against each template of a known set of templates, each template representing a standard pulse stream, wherein upon detection that the demodulated signal matches one of the known templates, the audible alarm detector is arranged to output an alarm detected signal indicating a presence of one of the standard pulse streams.
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