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US 5,164,703 AGranted
Audio intrusion detection system
AssigneeC & K Systems, Inc.
InventorStephen A. Rickman
Life of this patent
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AssigneeC & K Systems, Inc.
InventorStephen A. Rickman
Estimating the term…
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.
A supervisory circuit for use with an audio intrusion detection system having means for generating an audio signal in response to the detection of an audio intrusion sound, means for comparing said audio signal to an audio threshold signal, and means for generating an audio alarm signal in response to said comparison, said supervisory circuit comprising:
A supervisory circuit for use with an audio intrusion detection system having means for generating an audio signal in response to the detection of an audio intrusion sound, means for comparing said audio signal to an audio threshold signal, and means for generating an audio alarm signal in response to said comparison, said supervisory circuit comprising:
An improved intrusion detection system comprising:
Dependencies are inferred from the claim text.