Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-06-03
1994-11-08
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
H03B 2900
Patent
active
053634519
ABSTRACT:
An apparatus for reducing noise characterized by a number of input microphones arranged near an undesired noise source, a signal processor coupled to the input microphones and operative to develop a number of output signals from the input signals, and a number of speakers coupled to the output signals of the signal processor to produce anti-noise within a designated quiet zone. Each of the speakers derives a portion of its signal from each of the input microphones so that each output transducer has the maximum amount of information concerning the noise to be canceled. The method of the invention is characterized by the steps of detecting compression waves at a number of detection locations within a medium, and developing a number of complementary signals utilizing all of the detected compression wave information.
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Martinez J. Raul
Mason V. Bradford
Isen Forester W.
SRI - International
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