Apparatus for reducing noise in space applicable to vehicle pass

Details Apparatus for reducing noise in space applicable to vehicle pass Apparatus for reducing noise in space applicable to vehicle pass

1993-03-03

1995-05-16

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

054168449

ABSTRACT:
An apparatus for reducing periodical noises transmitted from a noise source into a vehicle passenger compartment. The apparatus comprises control sound sources for producing control sounds in the vehicle passenger compartment, residual noise sensors for detecting the residual noises in the vehicle passenger compartment, transfer function filters modeled on transfer function between the control sound sources and the residual noise sensors, and adaptive digital filters having variable filter coefficients. A reference signal is produced in the form of a series of impulses having the same period as the noises. The transfer function filters are convoluted with the reference signal to produce reference processed signals. The adaptive digital filters are convoluted with the reference signal to generate drive signals to drive the control sound sources. The filter coefficients of the respective adaptive digital filters are updated based on the processed reference signals and the residual noises to reduce the noises in the vehicle passenger compartment.

REFERENCES:
patent: 4153815 (1979-05-01), Chaplin et al.
patent: 5117401 (1992-05-01), Feintuch
Elliott et al., "A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration" IEEE transactions, on Acoustics, vol. Assp 35, No. 10, Oct. 1987, pp. 1423-1433.
Widrow et al "Adaptive Noise Cancelling: Principles and Applications" Proceedings of the IEEE, vol. 653, No. 12, Dec. 1975, pp. 1692-1716.

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