Activation circuit for battery-operated security alarm detection

Details Activation circuit for battery-operated security alarm detection Activation circuit for battery-operated security alarm detection

1992-10-07

1993-10-19

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

34082571, 34082576, H01L 4108

Patent

active

052548970

ABSTRACT:
The present invention relates to an activation circuit for a battery-operated security alarm detection system where current drain and, therefore, battery life is of concern. It employs a non-current drawing piezo element which only sees part of the frequency band of interest to briefly activate or wake up a current-drawing electret microphone which has a bandwidth broad enough to sees the entire audio band of interest.

REFERENCES:
patent: 3339104 (1967-08-01), Kushner
patent: 3665259 (1972-05-01), Brailsford
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 4542325 (1985-09-01), Kobayashi et al.
patent: 4585970 (1986-04-01), Koal et al.
patent: 5170087 (1992-12-01), Karr et al.

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