Noise reducing apparatus

Details Noise reducing apparatus Noise reducing apparatus

1988-09-30

1989-06-20

Fuller, B. R.

Acoustics

Sound-modifying means

By wave interference

181200, 181202, 181204, 181286, 181288, F01N 106

Patent

active

048402516

ABSTRACT:
A noise reducing apparatus in the form of a hollow body comprising two or more passage groups consisting of a plurality of passages. The length of each passage is determined such that the sound waves emitted from the passages of the adjacent passage groups form plane waves which are shifted by a half wavelength so that plane waves interfere each other. The apparatus can be secured to an opening of construction and reduce the level of sound pressure from a sound source without any closed shield construction surrounding the sound source.

REFERENCES:
patent: 4156476 (1979-05-01), Matsumoto et al.
patent: 4158401 (1979-06-01), Watsumoto et al.
patent: 4753318 (1988-06-01), Mizuno et al.

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