Vehicle internal noise reduction system

Details Vehicle internal noise reduction system Vehicle internal noise reduction system

1994-04-28

1995-12-05

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 731, 381 94, A61F 1106, H03B 2900

Patent

active

054736994

ABSTRACT:
A primary source is synthesized with a filter coefficient of a first adaptive filter into a canceling signal. The canceling signal is converted into a canceling sound and the canceling sound is generated from a speaker. A result of interference of the canceling sound with a noise sound is detected by a microphone as an error signal. The error signal is subjected to a sum of convolution products with the filter coefficient of the first adaptive filter in a LMS calculation circuit and the filter coefficient is updated therein. On the other hand, the error signal is subjected to a sum of convolution products with the canceling signal in another LMS calculation circuit and a filter coefficient of a second adaptive filter is updated. The updated filter coefficient of the second adaptive filter is sent to a compensation coefficient synthesizing circuit and therein the compensation coefficient is corrected by the filter coefficient. The corrected compensation coefficient updates the filter coefficient of the first adaptive filter. As a result, the first adaptive filter is automatically adjusted so as to reflect actual transmission characteristics in the passenger compartment, whereby a noise reduction with a stable performance is always obtained under any conditions of the passenger compartment.

REFERENCES:
patent: 4677676 (1987-06-01), Eriksson
patent: 5172416 (1992-12-01), Allie et al.
patent: 5295192 (1994-03-01), Hamada et al.

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