Apparatus for reducing noise in space applicable to vehicle comp

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear

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381 86, G10K 1116

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active

053254376

ABSTRACT:
In an apparatus for reducing noises in a space, signals related to noise generating conditions of a plurality of noise sources are detected, a signal component of the detected signals is selected on the basis of determination of which signal component is predominant over the other signal component in the noises in the space, and the selected signal component is filtered through adaptively determined filter coefficients to output drive signals to control sound source, the filter coefficients being updated through a control algorithm so as to reduce a residual noise of a residual noise detector such as microphones. The signal components to be selected include a signal component having a relatively high auto-correlated function characteristic and a signal component having a random characteristic.

REFERENCES:
patent: 5111507 (1992-05-01), Nakahi
Elliott et al. "A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration", IEEE Transactions on Acoustics, vol. ASSP-35, No. 10, Oct. 1987, pp. 1423-1433.

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