Intrusion alarm system

Details Intrusion alarm system Intrusion alarm system

G - Physics

08

B

349/30

G08B 13/00 (2006.01) G08B 1/08 (2006.01) G08B 7/08 (2006.01) G08B 13/08 (2006.01)

Patent

CA 1137207

INTRUSION ALARM SYSTEM ABSTRACT OF THE DISCLOSURE An intrusion alarm system and method is provided which includes one or more sound pulse transmitters that are triggered upon the opening of an entryway, such as a door or window, to produce a high-intensity sound pulse having a decibel level above a predetermined minimum. For example, each transmitter may comprise a percussive photoflash unit in combination with a pyrotechnic device which responds to the radiant output of the fired photoflash unit to emit the intense sound pulse. A centralized detector responds to the sound pulse above a predetermined threshold level to produce an alarm signal. Preferably, the detector comprises an electroacoustical transducer arrangement which provides the dual functions of both sound pulse detection and generation of an audible alarm.

334422

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