Band pass filter

Details Band pass filter Band pass filter

1990-06-27

1991-08-06

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

367901, 367 13, 367136, H04B 106, H04B 1700

Patent

active

050383280

ABSTRACT:
An active, relatively high gain, low power consuming band pass filter circuit centered at approximately 6 KHZ and having a pass band of 100-200 HZ. In a disclosed glass breakage sensor, the filter couples sensed ambient sounds of breaking glass to associated detection, driver and annunciator means. Signals of appropriate duration and frequencies indicative of breaking glass are thereby monitorable to define and induce an alarm condition within a security system.

REFERENCES:
patent: 3643173 (1972-02-01), Whitten
patent: 4855713 (1989-08-01), Brunius
Schilling et al., "Electronic Circuits", 1979, pp. 334-335.

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