Infra-sonic detector, and alarms including same

Details Infra-sonic detector, and alarms including same Infra-sonic detector, and alarms including same

1983-09-08

1986-04-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340614, G08B 1322

Patent

active

045860319

ABSTRACT:
A volumetric infra-sonic pick-up may be used in various combinations to form an infra-sonic or low-frequency alarm and intrusion detector. The detection device for alarm, surveillance and/or monitoring comprises an infra-sonic pick-up (1) below the sonic frequency range. The infra-sonic pick-up (1) comprises means acting as a pressure or pressure variation pick-up (2), an amplifier (3), and a filter which eliminates the audio or higher frequency signals. The pressure pick-up (2) is a microphone.

REFERENCES:
patent: 3854129 (1974-12-01), Haselton
patent: 4307387 (1981-12-01), Baxendale
patent: 4455631 (1984-06-01), San Giovanni
patent: 4468763 (1984-08-01), Braunling et al.

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