Antitheft system

Details Antitheft system Antitheft system

2007-05-29

2007-05-29

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S531000, C340S572400, C340S571000, C340S522000, C367S199000

Reexamination Certificate

active

10475565

ABSTRACT:
The present invention provides a burglar alarm system capable of accurately discriminating an alarm from a disturbance noise approximate to the alarm such as background music, ambient noises, etc. In a burglar alarm system comprising an alarm unit attached to an object to be protected from theft to emit an alarm of a particular frequency and an alarm sensor device for issuing an alarm signal upon sensing an alarm from the alarm unit, the alarm sensor device counts a predetermined number of waveform pulses of a received sound (S2, S5) more than once (S1˜S3, S4˜S6), determines, if it transpires that a differential between counted values falls within a predetermined time range, that the received sound is an alarm and issues an alarm signal (S7).

REFERENCES:
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patent: 5793289 (1998-08-01), Strzelec
patent: 7088231 (2006-08-01), Suzuka et al.
patent: 2005/0030173 (2005-02-01), Suzuka et al.

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