Apparatus and method for combining analog detection signals to p

Details Apparatus and method for combining analog detection signals to p Apparatus and method for combining analog detection signals to p

1989-10-06

1991-05-21

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340522, 340511, G08B 2300

Patent

active

050179063

ABSTRACT:
An apparatus and method for combining detection signals generated by intrusion detection systems to provide improved alarm integrity therefor. The apparatus and method have utility with mixed sensor technology and single sensor technology detection systems. In one embodiment, analog detection signals generated by system sensors are combined in an analog multiplier and the resulting decision signal is compared via a unipolar threshold comparator or a window comparator. In another embodiment, analog detection signals are amplitude limited prior to being combined in the analog multiplier. In a further embodiment, analog detection signals are subjected to average value processing such that the decision signal has a value equal to one-half of the sum of the sensor signals. In yet a further embodiment, analog dectection signals are amplitude limited prior to average value processing.

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patent: 4660024 (1987-04-01), McMaster
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