Differential detector of acoustic pressure

Details Differential detector of acoustic pressure Differential detector of acoustic pressure

1988-10-31

1990-04-24

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340566, G08B 1320

Patent

active

049203320

ABSTRACT:
An improved acoustic burglar alarm detects an aperiodic wave resulting from opening of a door or window, and adapts the threshold level, which discriminates between alarm events and non-alarm events, according to the ambient environment, thereby preventing wind from setting off an alarm, yet maintaining adequate sensitivity. The detection system features a microphone 1, preferably of electret type, a threshold comparator 5, a filtering circuit 7, a window comparator acting as a peak value detector, an integrator circuit 9, a voltage monitor 10, and an oscillator-counter 14. A monostable 16 triggers a relay 21 which sets off the alarm. A switch 15 permits selection between two alternate operating modes.

REFERENCES:
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4552022 (1985-11-01), DuRand, III
patent: 4692743 (1987-09-01), Holden et al.
patent: 4712093 (1987-12-01), Reichel et al.

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