Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1979-09-13
1981-07-14
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
367117, G01S 380
Patent
active
042790271
ABSTRACT:
Apparatus for locating an acoustic source which includes a pair of gradient microphones each of which is adapted to receive an acoustic wave on one axis with the two axes of the microphones being orthogonal to one another. Processing means are included for receiving first and second signals from the two gradient microphones in comparing the phase of the two signals, whereby alarm means are provided for producing a signal identifying a change in state of the phase comparison. Upon the change in state of the phase comparison, from either mutually in phase or mutually out of phase with one another, the point of closest proximity to the sensor is determined.
REFERENCES:
patent: 2966657 (1960-12-01), Price
patent: 3348195 (1967-10-01), Spandock
patent: 4189999 (1980-02-01), Anderson
Farley Richard A.
Honeywell Inc.
Jensen Roger W.
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