Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1989-03-28
1990-08-07
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
G10K 1116
Patent
active
049474340
ABSTRACT:
An electronic attenuator uses a speaker which is sheet-like in shape and is made of a piezoelectric material for generating a reversal sound. The attenuator uses a microphone installed in a noise transmittable space for detecting a noise and uses a control circuit for generating a reversal sound signal having a reverse phase and same sound pressure in relation to a noise on the basis of the noise signal detected by the microphone. The speaker receives the reversal sound signal from the control circuit and emits the reversal sound to the noise transmittable space so as to cancel the noise signal detected by the microphone. This electronic attenuator solves the problems of space required for the installation of a speaker, and reduces manufacturing costs and the like.
REFERENCES:
patent: 4367426 (1983-01-01), Kumada et al.
patent: 4665549 (1987-05-01), Eriksson et al.
patent: 4807294 (1989-02-01), Iwata et al.
Daikin Industries Ltd.
Isen Forester W.
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