Noise control composite

Communications – electrical: acoustic wave systems and devices – Sonar counter-measures

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H04K 300

Patent

active

054208254

ABSTRACT:
A composite for use on submarines and surface craft for controlling self-erated noise when listening with sonar. The composite includes two layers of PVF.sub.2 transducers separated by a layer of phase shifting or absorbing material. The inner transducer senses noise from the ship and subtracts this from the signal from the outer transducer representing noise plus the desired signal. In a second mode the sensed noise is regenerated through the outer transducer 180.degree. out of phase to cancel the noise and allow more accurate detection.

REFERENCES:
patent: 3971250 (1976-07-01), Taylor
patent: 4158189 (1979-06-01), Wardle
patent: 4184093 (1980-01-01), Sullivan
patent: 4236235 (1980-11-01), Gilbert
patent: 4295010 (1981-10-01), Murphy

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