Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-03-18
1995-01-24
Kuntz, Curtis
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 94, H03B 2900
Patent
active
053848535
ABSTRACT:
An apparatus for active reduction of noises transmitted from a noise source into a space. The active noise reduction apparatus comprises residual noise sensors for detecting the residual noises in the space. A reference signal is produced based upon the noise generating condition of the noise source. The reference signal is used, along with the detected residual noises, to drive control sound sources so as to reduce the noises in the space. A filter is adjusted to correspond to acoustic transfer characteristics between the control sound sources and the residual noise sensors. An identification sound is generated to correspond to the background noise level detected in the space and to the spectral distribution of the noises transmitted into the space. The coefficients of the filter are updated according to acoustic transfer characteristics between the control sound sources and the residual noise sensors. The acoustic transfer characteristics are obtained based upon the identification sound and the residual noises.
REFERENCES:
patent: 4677676 (1987-06-01), Eriksson
patent: 5216722 (1993-06-01), Popovich
"A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration", by Stephen J. Elliott et al, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-35, No. 10, Oct. 1987, pp. 1423-1434.
"Adaptive Noise Cancelling: Principles and Applications", by Bernard Widrow et al, Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975, pp. 1692-1716.
Doi Kazuhiro
Hamabe Isutomu
Kinoshita Akio
Muraoka Kenichiro
Kelly Mark D.
Kuntz Curtis
Nissan Motor Co,. Ltd.
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