Vehicle internal noise reduction system and method

Details Vehicle internal noise reduction system and method Vehicle internal noise reduction system and method

1994-06-22

1996-12-03

Coles, Sr., Edward L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, G10K 1115, H04B 1500

Patent

active

055816193

ABSTRACT:
In the noise reduction system to attenuate vehicle internal noise sounds by means of generating a canceling sound synthesized with an engine-originated vibration noise source signal, to prevent a remaining noise sound caused by insufficient follow-up characteristic of the adaptive filter updating at a rapid deceleration or acceleration condition of engine, while a generation of canceling sound and an updating of the adaptive filter are interrupted forcibly, the filter coefficient is reset to be a predetermined level and then therefrom a normal adaptation of the adaptive filter is restarted.

REFERENCES:
patent: 5426705 (1995-06-01), Yokota
U.S. application Ser. No. 8/154,074, filed Nov. 1993, Yokota et al.
U.S. application Ser. No. 8/214,489, filed Mar. 1994, Iidaka et al.
U.S. application Ser. No. 8/234,018, filed Apr. 1994, Tamamura et al.
U.S. application Ser. No. 8/180,995, filed Jan. 1994, Tamamura et al.
U.S. application Ser. No. 8/135,463, filed Oct. 1993, Yokota et al.
U.S. application Ser. No. 8/032,057, filed Mar. 1993, Tamamura et al.

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