Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-10-16
1992-04-21
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340522, 340526, G08B 1300
Patent
active
051072491
ABSTRACT:
A multi-sensor intrusion detection system having improved immunity to false alarm is disclosed. The sensor being less susceptible to the generation of false alarm has its output signal processed and held. The held signal is supplied to a logic gate which receives directly the signal from the other sensor. The output of the logic gate generates an alarm signal.
REFERENCES:
patent: 4134109 (1979-01-01), McCormick
patent: 4668941 (1987-05-01), Davenport
patent: 4853677 (1989-08-01), Yarbrough et al.
patent: 4882567 (1989-02-01), Johnson
patent: 4928085 (1990-05-01), DuRand, III et al.
C & K Systems, Co.
Ng Jin F.
Oda C.
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