Sound barrier for audible acoustic frequency management
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United States of America Patent
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Mar 13, 2012
Grant Date -
Nov 18, 2010
app pub date -
Dec 16, 2008
filing date -
Dec 21, 2007
priority date (Note) -
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Abstract
A sound barrier comprises a substantially periodic array of structures disposed in a first medium having a first density, the structures being made of a second medium having a second density different from the first density, wherein one of the first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, the speed of propagation of longitudinal sound wave being at least about 30 times the speed of propagation of transverse sound wave, and wherein the other of the first and second media is a viscoelastic or elastic medium.
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