Noise control devices

Details Noise control devices Noise control devices

1978-02-27

1979-05-29

Hix, L. T.

Acoustics

Sound-modifying means

Sound absorbing fence or screen

181286, 181288, 181292, 104124, 105452, G10K 1100, E04H 1700

Patent

active

041564766

ABSTRACT:
A noise control device which produces behind it an enlarged sound reducing region is disclosed. The device comprises a hollow structural body composed of a plurality of elongate hollow passages which are different in length and constructed such that the passage length is made the longest at a substantially center part in a vertical direction and is made gradually shorter from the center part toward upper and lower edges of the hollow structural body. The upper and lower edges allow direct propagation sound emitted from a noise source to pass thereover and therethrough.

REFERENCES:
patent: 3113634 (1963-12-01), Watters

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