Improvements in and relating to active sound attenuation

Details Improvements in and relating to active sound attenuation Improvements in and relating to active sound attenuation

1976-12-10

1978-10-24

Brown, Thomas W.

179 1F, H04R 128

Patent

active

041223039

ABSTRACT:
A primary sound wave in a confined space is attenuated by a secondary sound wave generated to null with the primary wave. The secondary wave is produced by a first electrical signal representing the primary wave as sensed by a microphone, which is convolved with a second signal derived from the system impulse response as a program of operational steps. A second convolution process can cancel feedback of the secondary sound wave. Downstream residual noise is sensed by a second microphone which feeds a microprocessor which adjusts the convolution processes.

REFERENCES:
patent: 2776020 (1957-01-01), Conover
patent: 2983790 (1961-05-01), Olson
patent: 3784747 (1974-01-01), Berkley
patent: 3936606 (1976-02-01), Wanke

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