Noise cancellation device, engine-noise cancellation device,...

Details Noise cancellation device, engine-noise cancellation device,... Noise cancellation device, engine-noise cancellation device,...

2005-09-13

2005-09-13

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

C381S071800, C381S071130

Reexamination Certificate

active

06944303

ABSTRACT:
A phase-locked loop (PLL) circuit generates a sine wave signal synchronized with an input signal. The sine wave signal is directly supplied to a first multiplier. The sine wave signal is also supplied to a second multiplier after shifting the phase by 90 degrees by an all-pass filter (APF). The first and second multipliers multiply the corresponding input signals by corresponding predetermined gains. An adder sums the products. Sound corresponding to the sum is produced from a speaker to a sound field. A filter-controlling unit controls the gains for the first and second multipliers, respectively, to minimize an error signal “e” for the output level of a microphone installed at a listening position.

REFERENCES:
patent: 4475232 (1984-10-01), Shaw
patent: 4878188 (1989-10-01), Ziegler, Jr.
patent: 5010576 (1991-04-01), Hill
patent: 5359662 (1994-10-01), Yuan et al.
patent: 5633795 (1997-05-01), Popovich
patent: 5692055 (1997-11-01), Sano et al.
patent: 5713438 (1998-02-01), Rossetti et al.
patent: 5758311 (1998-05-01), Tsuji et al.
patent: 5912821 (1999-06-01), Kobayashi
patent: 5974155 (1999-10-01), Kashani et al.
patent: 6430295 (2002-08-01), Handel et al.
patent: 6654467 (2003-11-01), York et al.
patent: 6728380 (2004-04-01), Zhu et al.

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