Intrusion alarm system

Details Intrusion alarm system Intrusion alarm system

1978-09-06

1980-03-04

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340541, 340545, 340548, 116 17, G08B 1308

Patent

active

041919475

ABSTRACT:
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.

REFERENCES:
patent: 2905762 (1959-09-01), Rettie et al.
patent: 3714647 (1973-01-01), Litman
patent: 4001805 (1977-01-01), Golbe
patent: 4117462 (1978-09-01), Miller

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