Acoustics – Sound-modifying means – Sound absorbing fence or screen
Patent
1984-02-23
1986-04-22
Hix, L. T.
Acoustics
Sound-modifying means
Sound absorbing fence or screen
181286, 181288, B64F 126
Patent
active
045836159
ABSTRACT:
The invention relates to a noise control device which is placed between a noise source and an area which is to be protected. The device includes at least one passageway through the body portion with a plurality of chambers extending into the body portion from both sides of the passageway, the chambers and the passageway being sized to cause a 180.degree. phase lag in a sound passing through the passageway, thus causing destructive interference with sound passing over the barrier.
REFERENCES:
patent: 4069768 (1978-01-01), Matsumoto et al.
Brown Brian W.
Hix L. T,.
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