Vibration-responsive intruder alarm system

Details Vibration-responsive intruder alarm system Vibration-responsive intruder alarm system

1980-02-20

1981-12-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307117, 340550, G08B 1322

Patent

active

043073875

ABSTRACT:
The effects of wind noise signals from fence-mounted transducers are overcome by basing alarm indications on signal components in at least two narrow frequency bands centered on, say, 120 Hz and 240 Hz.

REFERENCES:
patent: 3614724 (1971-10-01), Brown et al.
patent: 3913085 (1975-10-01), Farstad
patent: 4090180 (1978-05-01), Barowitz et al.
patent: 4097025 (1978-06-01), Dettmann et al.
patent: 4107660 (1978-08-01), Chleboun

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