Motion detector with improved signal discrimination

Details Motion detector with improved signal discrimination Motion detector with improved signal discrimination

1992-05-21

1994-05-03

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340511, G08B 1318

Patent

active

053091477

ABSTRACT:
An infrared motion detection device for detecting the presence of a target object including special circuitry for reducing false alarms. In particular, coupling circuitry is interposed between signal processing circuitry and comparator circuitry, which serves to match the baseline level of the signal from the signal processing circuitry with the baseline level of a threshold or thresholds defined by the comparator circuitry. The coupling circuitry may be implemented in a particularly simple manner, which reduces the manufacturing cost of the circuitry and the device.

REFERENCES:
patent: 3631434 (1971-12-01), Schwarz
patent: 3703718 (1972-11-01), Berman
patent: 3760399 (1973-09-01), Schwarz
patent: 3928843 (1975-12-01), Sprout et al.
patent: 3958118 (1976-05-01), Schwarz
patent: 4529874 (1985-07-01), Zierhut
patent: 4570247 (1986-02-01), Walker et al.
patent: 4668942 (1987-05-01), Eccleston et al.
Schematic signal processing circuit diagram, asserted by applicants to be prior art.

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