Direction-sensing acoustic glass break detecting system

Details Direction-sensing acoustic glass break detecting system Direction-sensing acoustic glass break detecting system

1994-05-16

1995-11-28

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340566, 340541, 381 81, 381 92, 381 66, G08B 1300, H04B 300

Patent

active

054711959

ABSTRACT:
Dual microphones and a time-of-arrival processing circuit comprise a direction-sensing system which improves the false alarm immunity of an acoustic glass break detector by restricting its coverage to a well-defined zone. By comparing the arrival times of an abrupt sound at two spaced microphones, the processing circuit determines the direction of the sound. If the sound originated in the intended coverage zone, the processing circuit generates a signal which enables the glass break detector; otherwise, the detector is inhibited. When the improved glass break detector is oriented so that potential false alarm sources are outside the coverage zone, false alarm immunity is enhanced.

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