Vehicle internal noise reduction system

Details Vehicle internal noise reduction system Vehicle internal noise reduction system

1993-10-13

1995-06-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

054267056

ABSTRACT:
In an automobile vehicle, fuel injection pulse outputted from an electronic control unit of an engine is transformed into a voltage value as a primary source. The voltage values is transformed by the convolution sum process and synthesized into a sound to cancel the engine noise. The synthesized sound is outputted through the speaker in the passenger compartment. On the other hand, the reduced noise sound is detected as an error signal by the microphone. The error signal is inputted to an LMS circuit where the filter coefficient is updated in accordance with both inputted error signal and the primary source. Since the fuel injection pulse before the combustion stroke is used, the noise sound can be precisely and immediately reduced even in the transient conditions of the vehicle operation.

REFERENCES:
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patent: 5018202 (1991-05-01), Takahashi et al.
patent: 5111507 (1992-05-01), Nakaji
U.S. application Ser. No. 08/154,074 , filed Nov. 18, 1993, Yokota et al.
U.S. application Ser. No. 08/264,150, filed Jun. 22, 1994, Shibata et al.
U.S. application Ser. No. 08/214,489, filed Mar. 18, 1994, Iidaka et al.
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U.S. application Ser. No. 08/032,057, filed Mar. 16, 1993, Tamamura et al.
U.S. application Ser. No. 08/180,995, filed Jan. 14, 1994, Tamamura et al.

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