Audio intrusion detection system

Details Audio intrusion detection system Audio intrusion detection system

1991-05-02

1992-11-17

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340514, 340522, 340566, G08B 2900

Patent

active

051647036

ABSTRACT:
A supervisory circuit for use with an audio intrusion detection system is disclosed. The supervisory circuit periodically generates an audio test signal which is supplied to a sounder which emits an audio test sound. The audio test sound is directed into a volume of space, in the same volume of space as which the audio intrusion detection system is directed to detect. The audio intrusion detection system detects the test sound and generates an audio test signal in response thereto. During the generation of the audio test sound, the comparing apparatus of the audio intrusion detection system is disabled. The audio test signal generated by the audio intrusion detection system is then compared to a test threshold signal. A test result signal is generated in response to the comparison with the test result signal indicative of the operability of the audio intrusion detection system.

REFERENCES:
patent: 4386343 (1983-05-01), Shiveley
patent: 4710750 (1987-12-01), Johnson
patent: 4853677 (1989-08-01), Yarbrough et al.
patent: 4920332 (1990-04-01), Philippe
patent: 4928085 (1990-05-01), DuRand, III et al.
patent: 4950915 (1990-08-01), Spies et al.

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