Noise reducing apparatus

Details Noise reducing apparatus Noise reducing apparatus

1989-07-06

1992-12-01

Hix, L. T.

Acoustics

Sound-modifying means

By wave interference

181286, 181288, F01N 106

Patent

active

051681307

ABSTRACT:
A noise reducing apparatus comprising a first passageway group consisting of a plurality of first passageways aligned in parallel with each other for forming a first flat wave A by sound waves having a first same phase passed through each first passageway from a sound source, and a second passageway group consisting of a plurality of second passageways aligned in parallel with each other for forming a second flat wave B by sound waves being a second same phase passed through each second passageway from the sound source, said first passageway group having positioned above said second passageway group, and the phase of said first flat wave being advanced by a phase difference of 240.degree..+-.60.degree. with respect to the phase of said second flat wave to thereby reduce noise emitted from the sound source by interference of the first and second flat waves A and B.

REFERENCES:
patent: 4156476 (1979-05-01), Matsumoto et al.
patent: 4753318 (1988-06-01), Mizuno et al.
patent: 4840251 (1989-06-01), Murase et al.
patent: 4858720 (1989-08-01), Murase et al.

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