Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1990-06-29
1991-12-31
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340521, 340552, 340554, 340561, 367 94, G08B 1900
Patent
active
050775480
ABSTRACT:
A dual-tech intruder detection system includes a pair of intruder-detecting subsystems, each functioning to detect intrusion by a technology different from the other, and apparatus for activating an alarm in response to both subsystems detecting intrusion within a predetermined time interval. A supervisory circuit serves to detect a malfunction in one of the subsystems. Default apparatus, responsive to the output of the supervisory circuit, causes the alarm activating apparatus to activate an alarm in response to the still-functioning subsystem's detection of intrusion. To reduce false alarms from the still-functioning subsystem, circuit apparatus are provided for reducing the sensitivity of such subsystem in response to the output of the supervisory circuit.
REFERENCES:
patent: 4437089 (1984-03-01), Achard
patent: 4660024 (1987-04-01), McMaster
patent: 4710750 (1987-12-01), Johnson
patent: 4764755 (1988-08-01), Pedtke et al.
patent: 4833450 (1989-05-01), Buccola et al.
Crosland Donnie L.
Detection Systems Inc.
Kurz Warren W.
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