Intrusion detection system

Details Intrusion detection system Intrusion detection system

1975-11-05

1980-06-03

Blum, Theodore M.

Communications: electrical

Condition responsive indicating system

With particular system function

340551, 340565, 340666, 340 38R, G08B 1900

Patent

active

042064511

ABSTRACT:
A system for detecting intrusions into a protected area by personnel, vehicles, or other objects, including a sensor capable of detecting magnetic and/or pressure disturbances and a signal processing means for generating an alarm signal when an unwanted intrusion occurs. The signal processing apparatus includes a first band-pass filter for selecting the portion of the signal from the sensor which is within a first frequency range, and a second band-pass filter for selecting a portion of the signal within a second frequency range. Logic circuitry is provided to process the two analog signals from the two band-pass filters using amplitude, signal energy and zero-crossing characteristics of the two signals in a cross-channel relationship to eliminate false alarms which might be caused by disturbances such as lightning, thunder, or wind.

REFERENCES:
patent: 3665445 (1972-05-01), Riley, Jr.
patent: 3747036 (1973-07-01), Erdmann
patent: 3824532 (1974-07-01), Vandierendonck
patent: 3885234 (1975-05-01), Fujimoto

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