Audio intrusion detection system
First Claim
1. 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:
- means for generating a test audio sound;
means for disabling said comparing means of said audio intrusion detection system during the generating of said test audio sound;
means for receiving said audio signal from said audio intrusion detection system, generated in response to the detection of said test audio sound, and for comparing said audio signal to a test threshold signal; and
means for generating a test result signal in response to said comparison, said test result signal indicative of the operability of said audio intrusion detection system.
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Accused Products
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.
196 Citations
16 Claims
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1. 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:
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means for generating a test audio sound; means for disabling said comparing means of said audio intrusion detection system during the generating of said test audio sound; means for receiving said audio signal from said audio intrusion detection system, generated in response to the detection of said test audio sound, and for comparing said audio signal to a test threshold signal; and means for generating a test result signal in response to said comparison, said test result signal indicative of the operability of said audio intrusion detection system. - View Dependent Claims (2, 3, 4)
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5. 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:
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means for generating a test audio sound; means for disabling the generation of an alarm signal by said audio intrusion detection system, during the generation of said test audio sound; and means for disabling the commencement of the generation of said test audio sound in response to the generation of an alarm signal by said audio intrusion detection system. - View Dependent Claims (6, 7)
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8. An improved intrusion detection system comprising:
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means for generating a pressure signal in response to the detection of a pressure change caused by an intruder in a volume of space; means for generating an audio signal in response to the detection of an audio sound caused by the intruder in the same volume of space; means for generating an alarm signal in response to said pressure signal and said audio signal; means for generating a test audio sound to test said system; and means for disabling the generation of the audio signal during the generation of said test audio sound. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification