Intrusion monitoring device

Details Intrusion monitoring device Intrusion monitoring device

1992-11-19

1995-08-22

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340511, 340567, 340661, G08B 1300

Patent

active

054444314

ABSTRACT:
A voltage level detector circuit comprises an amplifier for amplifying the electrical output signal from a detection device, a pair of comparators for comparing the amplified electrical output signal with a respective threshold signal, wherein each comparator is adapted to change its output state when the amplified electrical output signal exceeds the respective threshold signal, and a pair of threshold processors responsive to a superimposed noise or interference component of the electrical output signal from the detection device, or of an amplified version thereof, and adapted to provide the comparators with respective threshold signals which vary with the superimposed noise or interference component, so as to maintain a relationship between the amplified electrical output signal and the threshold signal which is substantially independent of the superimposed noise or interference component.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 3958118 (1976-05-01), Schwarz
patent: 4527158 (1985-07-01), Runnels
patent: 4611127 (1986-09-01), Ibrahim et al.
patent: 4787722 (1988-11-01), Claytor
patent: 5084696 (1992-01-01), Guscott et al.

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