Active control apparatus using adaptive digital filter

Details Active control apparatus using adaptive digital filter Active control apparatus using adaptive digital filter

1993-07-06

1994-08-09

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, G10K 1116

Patent

active

053373669

ABSTRACT:
An active control apparatus using an adaptive IIR digital filter includes a coefficient control portion for updating the filter coefficient of adaptive IIR digital filter so as to minimize an output error signal level, and a coefficient control portion for updating the filter coefficient of a recursive portion so as to minimize the output level of recursive portion. The filter coefficient of recursive filter is updated by these two coefficient control portions and in parallel or in a time-dividing manner.

REFERENCES:
patent: 4987598 (1991-01-01), Eriksson
patent: 5172416 (1992-12-01), Allie et al.
patent: 5259033 (1993-11-01), Goodings et al.

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