Acoustic presence detection method and apparatus

Details Acoustic presence detection method and apparatus Acoustic presence detection method and apparatus

1970-07-23

1978-04-04

Farley, Richard A.

Communications: electrical

Selective

Intelligence comparison for controlling

340 6R, G08B 1300

Patent

active

040830314

ABSTRACT:
A method and means for passively detecting presence of noise radiating dees in a noise environment by determining the number of times per time sample that a received noise signal upwardly crosses a preselected threshold level, comparing this number with the number of upward crossings caused by a standard noise signal or background noise signal, and applying a predetermined ratio criteria. The noise sensors in the detection system may comprise a directional acoustic transducer in combination with an omnidirectional acoustic transducer, and acoustic transducer in combination with an artificially generated noise signal, or a single acoustic transducer.

REFERENCES:
patent: 2400552 (1946-05-01), Hoover, Jr.
patent: 3159807 (1964-12-01), Asbury, Sr.
patent: 3588803 (1971-06-01), Fleming, Jr. et al.

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