Apparatus and method for actively reducing vibration and/or nois

Details Apparatus and method for actively reducing vibration and/or nois Apparatus and method for actively reducing vibration and/or nois

1997-05-16

1999-06-08

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

36472419, G10K 1116

Patent

active

059109939

ABSTRACT:
In apparatus and method for actively reducing a periodic vibration and/or noise, a divergence determinator is provided in which a presence or absence of a higher order divergence of a control of the reduction of the periodic vibration and/or noise is determined on the basis of a sum of two sampled values of at least one of either a drive signal y or a residual wave (vibration or noise) signal e, phases of the two sampled values being mutually deviated from each other by an approximately half period of a fundamental order of the corresponding drive or residual wave signal.

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S. Elliott, et al, "A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-35, No. 10, Oct. 1987; pp. 1423-1434.

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