Fire alarm system with smoke particle discrimination

Details Fire alarm system with smoke particle discrimination Fire alarm system with smoke particle discrimination

1996-01-05

1998-06-09

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340517, 340519, 340556, 340630, 34082506, 34052507, 340514, G08B 2900

Patent

active

057641420

ABSTRACT:
A fire detection system provides multiple levels of signal processing so as to minimize the effects of noise from various sources. In a first level of processing any DC bias in signals received from detectors is removed. In a second level of processing, signal values from current sample times for a given detector are compared to one or more prior sample values from that detector for purposes of removing large transient pulses due to dust particles and the like. In a third level of processing, high frequency noise, perhaps from electrical sources, is filtered from the representation of the signal. Finally, the fully processed signal value is compared to one or more threshold values so as to make a determination as to the presence or absence of a pre-alarm or a fire condition.

REFERENCES:
patent: 5132548 (1992-07-01), Borden et al.
patent: 5155468 (1992-10-01), Stanley et al.
patent: 5471194 (1995-11-01), Guscott
patent: 5477218 (1995-12-01), Mammoto et al.

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