Active noise control apparatus for three-dimensional space

Details Active noise control apparatus for three-dimensional space Active noise control apparatus for three-dimensional space

1993-02-19

1994-09-06

Wayner, William E.

Refrigeration

Muffler or sound dampener

181206, 381 71, 454206, A61F 1106, F25D 1900

Patent

active

053437136

ABSTRACT:
An active noise control system for a three-dimensional space, including noise detecting means, sound generating means, noise control effect detecting means and a control device consisting of a phase of a wave signal fed from the noise detecting means wherein a plurality of noise control effect detecting means and sound generating means are disposed at a distance shorter than a wavelength of the noise to be controlled, and input signals of the respective sound generating means and output signals of the respective noise control effect detecting means are fed through filters, separately, to control the sound for active noise control. In case of an air conditioner, the noise control effect detecting means are disposed at positions where an air stream flowing through the air conditioner is not obstructed thereby.

REFERENCES:
patent: 5125241 (1992-06-01), Nakanishi et al.
patent: 5216722 (1993-06-01), Popovich

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