Vehicle internal noise reduction system

Details Vehicle internal noise reduction system Vehicle internal noise reduction system

1993-11-18

1995-04-18

Wolfe, Willis R.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, 181206, A61F 1106

Patent

active

054085322

ABSTRACT:
An ignition pulse shaped and demultiplied is used as a primary source and this primary source is converted into a canceling signal after being subjected to the sum of convolution products process with filter coefficients of an adaptive filter. Further the canceling signal is converted into a canceling sound by a speaker and outputted to the passenger compartment to cancel a vibration noise at a noise receiving point. The state of noise reduction is detected as an error signal by a microphone and the error signal is inputted to an exponential averaging circuit where the error signal is exponentially averaged with previous error signals by a trigger signal of the primary source from a trigger signal generating circuit. The error signal, as a result of this averaging, is compressed and then outputted to a LMS operational circuit. In the LMS operational circuit the filter coefficients are updated based on the primary source inputted via a C.sub.MNO circuit and the compressed error signal.

REFERENCES:
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4506380 (1985-03-01), Matsui
patent: 4753318 (1988-06-01), Mizuno et al.
patent: 5337365 (1994-08-01), Hamabe et al.
patent: 5343713 (1994-09-01), Okabe et al.

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