Active attenuation of noise in a closed structure

Details Active attenuation of noise in a closed structure Active attenuation of noise in a closed structure

1982-12-15

1985-12-31

Dwyer, James L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 86, C10K 1116

Patent

active

045625891

ABSTRACT:
This invention is directed to a system for the active acoustic attenuation of noise produced in the interior of an enclosure by a source of noise which in one aspect comprises input sensing operable to sense the source noise to be attenuated, cancellor adapted to produce noise 180.degree. out of phase with the source noise and error sensor operable to sense the acoustic summation of the source noise and the noise produced by the cancellor. The input sensor, cancellor and error sensor are each preferably disposed at or immediately adjacent an area of high acoustic pressure within the enclosure. The system further includes a second input sensor disposed adjacent the source of noise, a second cancellor adapted to introduce noise 180.degree. out of phase with the source noise at a location at or immediately adjacent the enclosure wall and second error sensor disposed in the interior of the enclosure. Each set of input sensing means, cancellor and error sensor are adapted to be connected to an electronic controller means operable to process signals from the input sensor, produce outputs to drive the cancellor for the introduction of cancelling sound waves into the enclosure for combination with the source sound waves, and then adjust such outputs based on signals received from the error sensor.

REFERENCES:
patent: 2361071 (1944-10-01), Vang
patent: 3685610 (1972-08-01), Bschorr
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
Glenn E. Warnaka, Active Attenuation of Noise-The State of the Art, Noise Control Engineering/May-Jun. 1982, pp. 100-110.

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