Intrusion sensing device

Details Intrusion sensing device Intrusion sensing device

1978-07-17

1980-09-02

Brown, Thomas W.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181160, 340545, H04R 1700, G08B 1300

Patent

active

042208319

ABSTRACT:
An intrusion sensing device includes a sound frequency discriminating micophone having a diaphragm coupled to the atmosphere through a closed end resonating chamber having a length equal to one quarter the median wavelength of a relatively narrow band of sound frequencies peculiar to the act of intrusion into a building or the like. The diaphragm has a layer of piezoelectic material bonded thereto for generating an alarm signal only when sounds within such narrow band of frequencies are received within the resonating chamber. A linear amplifier connected to the microphone has an extremely low current drain, permitting continuous operation of the device while using small, low power batteries.

REFERENCES:
patent: 1715831 (1929-06-01), Hahnemann
patent: 3331970 (1967-07-01), Dundon et al.
patent: 3754208 (1973-08-01), Eilers
patent: 3970879 (1976-07-01), Kumon

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