Vibration responsive intruder alarm systems

Details Vibration responsive intruder alarm systems Vibration responsive intruder alarm systems

1978-04-21

1980-09-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1322

Patent

active

042233046

ABSTRACT:
Electric signals in two narrow frequency bands, centered on thirty-three and one hundred Hertz, arising from ground or airborne vibrations incident on one or more geophones are processed to give an alarm when signal components in the two bands exhibiting a rapid rise to greater than a predetermined amplitude level, characteristic of human footsteps within a protected area, occur at more than a predetermined repetition rate.

REFERENCES:
patent: 3614724 (1971-10-01), Brown et al.
patent: 3665445 (1972-05-01), Riley, Jr.
patent: 3903512 (1975-09-01), Laymon
patent: 4090180 (1978-05-01), Barowitz et al.

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