Acoustics – Sound-modifying means – Housing or enclosure
Patent
1987-04-10
1989-04-18
Fuller, B. R.
Acoustics
Sound-modifying means
Housing or enclosure
181286, 181288, 181291, 181293, E04B 182
Patent
active
048218391
ABSTRACT:
Disclosed herein is an improved sound absorbing diffusor device wherein the surface designed to face the sound source includes a plurality of sound absorbing wells of equal widths but different depths separated by thin sound absorbing dividers. The depths of the individual wells are based upon the quadratic-residue number theory sequence which is used in acoustic design. The wells are covered with an open weave fabric adhered thereover which fabric is specifically chosen for its ability to allow sound to pass therethorugh to the wells and dividers. Tests performed on the inventive sound absorbing diffusor have revealed significant reduction in sound levels of reflected sounds over that which would accrue from a flat absorptive panel.
REFERENCES:
patent: 1875074 (1932-08-01), Mason
patent: 2567070 (1951-09-01), Hjastsater
patent: 4244439 (1981-01-01), Wested
patent: 4330046 (1982-05-01), Lerner et al.
D'Antonio Peter
Konnert John H.
Fuller B. R.
RPG Diffusor Systems, Inc.
Spiegel H. Jay
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