Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1989-09-29
1991-07-02
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 94, G10K 1116
Patent
active
050292188
ABSTRACT:
A noise cancellor includes a first sensor for detecting a noise generated from a driving device and converting the noise to electric signals. A signal processor receives the electric signals and forms control signals by multiplying the electric signals by a predetermined factor series. In response to the control signals, a speaker produces sound which interferes with the noise so as to cancel the noise at an object point. A second sensor detects sound at the object point and converts them to electric signals which are inputted to the signal processor. The signal processor switches the control mode, in accordance with a predetermined condition, to an adaptive active control wherein the factor series is changed in response to the electric signal applied from the second sensor or an active control wherein the factor series is fixed.
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J. E. Ffowes Williams et al; "Anti-Phase Noise Reduction"; 1985; Phys. Technol.; vol. 16; pp. 19-24, 31.
Isen Forester W.
Kabushiki Kaisha Toshiba
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