Microwave intrusion detector with threshold adjustment in respon

Details Microwave intrusion detector with threshold adjustment in respon Microwave intrusion detector with threshold adjustment in respon

1994-10-26

1996-12-03

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340552, 340573, 340565, 342 99, G08B 1318

Patent

active

055812376

ABSTRACT:
A microwave intrusion detector is provided with a periodic signal detector that identifies periodic signals not typical of an intrusion and adjusts the alarm threshold in response such identification. The intrusion detector includes an adjustable threshold and a noise compensating circuit that actively adjusts the threshold at a first predetermined rate to mask background noise levels. The periodic signal detector modifies the adjustment, increasing the predetermined rate, when it detects a periodic signal typical of a motor, fan, florescent light or the like. The periodic signal detector also cancels or disables any pending or ongoing alarm to provide sufficient time for the threshold adjustments at the increased rate.

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patent: 5276427 (1994-01-01), Peterson
patent: 5331308 (1994-07-01), Buccola

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