Active attenuation of recurring sounds

Details Active attenuation of recurring sounds Active attenuation of recurring sounds

1977-05-03

1979-05-08

Cooper, William C.

179 1SD, H04B 1500, G10L 100

Patent

active

041538153

ABSTRACT:
This invention concerns a method of, and apparatus for, reducing the ambient noise level at a location in the vicinity of a source of recurring noise. In its preferred embodiments the invention involves generating a series of cancelling noise signals which are exactly synchronized with the bursts of recurring noise from the source and adapting the cancelling signals in the series on the basis of the success achieved in nulling the noise from the source at the location.

REFERENCES:
patent: 3071752 (1963-01-01), Strasberg
patent: 3936606 (1976-02-01), Wanke
patent: 4025724 (1977-04-01), Davidson
patent: 4044203 (1977-08-01), Swinbanks

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