Method of actively controlling noise, and apparatus thereof

Details Method of actively controlling noise, and apparatus thereof Method of actively controlling noise, and apparatus thereof

1994-12-08

1997-11-18

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

From appliance

381 714, 381 941, H03B 2900

Patent

active

056895720

ABSTRACT:
In an active noise-reduction controlling apparatus, there are provided a reference sensor for outputting a reference signal corresponding to information about a noise source, a noise-reduction error sensor for detecting a noise-reduction condition, an adding acoustic wave source controlled to produce an acoustic wave having the same amplitude as that of an acoustic wave received at the noise-reduction error sensor and having a phase opposite to that of the acoustic wave received as the noise-reduction error sensor; a first adaptive digital filter for processing the reference signal to output a control signal of the adding acoustic wave source, a second adaptive digital filter for setting a predicted value of a transfer function between an input signal of the adding acoustic wave source and an output signal of said noise-reduction error sensor, a filter coefficient controlling unit for optimizing a coefficient of the first adaptive digital filter with employment of the predicted value of the transfer function and the output of the noise-reduction error sensor, and a control unit for correcting the predicted value of the transfer function in accordance with an environmental change.

REFERENCES:
patent: 4589137 (1986-05-01), Miller
patent: 4677676 (1987-06-01), Eriksson et al.
patent: 5022082 (1991-06-01), Eriksson et al.
patent: 5278780 (1994-01-01), Eguchi
patent: 5384853 (1995-01-01), Kinoshita et al.

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