Fire detector and noise de-influence method
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United States of America Patent
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Dec 11, 2001
Grant Date -
N/A
app pub date -
Jul 24, 2000
filing date -
Jul 27, 1999
priority date (Note) -
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Abstract
It is prevented that a malfunction occurs because of a noise. A smoke detection section samples as a smoke detection signal a signal digitized after being output from a light reception section when a light emission section glows, and updates a previous smoke detection signal. A noise detection section samples as a noise detection signal a signal output from the light reception section when the light emission section is not driven to glow. When the noise detection signal exceeds a predetermined noise level, a noise de-influence unit disables updating of the previous smoke detection signal with the newly sampled smoke detection signal so as to process a noise.
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