Ambient noise intruder alarm

Details Ambient noise intruder alarm Ambient noise intruder alarm

1979-05-07

1980-12-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307117, 340550, 367 93, G08B 1316

Patent

active

042413389

ABSTRACT:
Two receivers arranged inside and outside a closed space, respectively, are responsive to ambient or environmental noise and a comparator provides an alarm signal when the difference between the outputs of the two receivers falls below a threshold, thereby indicating that the wall to the space has been breached. Alternatively, the two receivers may be arranged in spaced relation within the space and the comparator provides the alarm signal when the difference between the two outputs rises above a threshold, thereby indicating that an intruder is present and closer to one receiver than the other. The apparatus consumes little energy during the watch period and does not depend on itself radiating energy.

REFERENCES:
patent: 3109165 (1963-10-01), Bagno
patent: 3721972 (1973-03-01), Hermans
patent: 4086586 (1978-04-01), Spirig

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