Alarm system for detecting an audio signal when glass breakage o

Details Alarm system for detecting an audio signal when glass breakage o Alarm system for detecting an audio signal when glass breakage o

1992-07-23

1995-05-09

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340506, 340514, 340550, 340691, G08B 1322

Patent

active

054144094

ABSTRACT:
A processor, such as a microprocessor, responds to the detection of an input audio signal generated by glass breakage to cause an alarm to be indicated, such as at a remotely located alarm control panel. The system determines when the input power supply voltage supplied to the system falls below a selected low voltage level. The system is placed in a test mode of operation in response to a uniquely characterized, humanly generated input sound signal and then can be tested by any appropriate humanly generated input sound signal. The system continually monitors ambient background noise and determines when an absence thereof occurs so as to provide an indication of such absence to alert the user to the possibility that the system may have been purposely comprised. The system further uses a number of indicators arranged so that the meanings thereof are different depending on whether the system is in an alarm detection mode of operation or in a test mode of operation. Finally, the system operates in conjunction with a different intrusion event detection device so that, if a glass breakage signal is detected by the system, the detection of an intrusion event by the other device is monitored so as to confirm that a true intrusion has occurred before an alarm is indicated.

REFERENCES:
patent: 3832629 (1974-08-01), Cernek, Jr.
patent: 4283657 (1981-08-01), Gordon et al.
patent: 4424458 (1984-01-01), Buck et al.
patent: 4520354 (1985-05-01), Umeda et al.
patent: 4810998 (1989-03-01), Hwang
patent: 5192931 (1993-03-01), Smith et al.

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