Intrusion detection apparatus having multiple channel signal pro

Details Intrusion detection apparatus having multiple channel signal pro Intrusion detection apparatus having multiple channel signal pro

1991-09-09

1993-03-16

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 367136, G08B 1300, H04B 106

Patent

active

051948486

ABSTRACT:
Intrusion detection apparatus for use in perimeter security systems and the like is provided with multiple channel signal processing. Each signal processor includes a bandpass filter whose passband is selectable. Each is respectively responsive to sensed movement including vibrations within the associated selected passband. An output affirmative signal is generated if the amplitude of the input signal constituent within the associated frequency range exceeds a threshold level for a predetermined period of time. A logic circuit receives the outputs of all of the signal processors and provides an output alarm signal when a predetermined combination of affirmative signals is received from the signal processors. Such logic circuit preferably works with digital signals obtained by analog-to-digital conversion. A threshold bias adjustment may be provided for adjusting the threshold amplitude of at least one input signal so that ambient noise may be taken into consideration by the logic circuit so that as ambient noise increases the tendency otherwise present to generate a false alarm will be impeded.

REFERENCES:
patent: 3614724 (1971-10-01), Brown et al.
patent: 3833897 (1974-09-01), Bell et al.
patent: 4223304 (1980-09-01), Barowitz et al.
patent: 4307387 (1981-12-01), Baxendale
patent: 4853677 (1989-08-01), Yarbrough et al.
Information Sheet Vindicator Corporation Locator TW-3000 Taut Wire Fence Alarm No. of pages: 10.

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