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Sound research at Acoustical Society meeting
Date:5/9/2011

ick Ovenden at the University College London, U.K., changes in weather significantly alter the way sound travels. The effect can become so pronounced that areas with normally modest highway noise can suddenly become a din of traffic sounds, potentially exceeding the U.S. Federal Highway Administration's noise abatement criteria maximum of 67 decibels. The reason for this is the well-known mechanism of refraction in which sound traveling upwind or downwind behaves very much like light passing through a prism. Sound traveling upwind tends to be bent, or refracted, toward the sky; sound traveling downwind is refracted toward the ground. Similar effects happen as sound passes between zones of different temperatures, where colder air lying between the ground and a layer of warmer air traps the sound close to the ground; such temperature conditions often occur around dawn and dusk. Even the presence of sound barriers may not compensate for this effect. The team's research suggests that highway sound may, under certain weather conditions, travel upward steeply before being directed back toward the ground, overcoming barriers even eight feet high and producing high noise exposure at distances nearly a half mile from the freeway. Talk 2pNS3, "Investigations of environmental and terrain effects on the propagation of freeway noise," is in the afternoon session on Tuesday, May 24 in Willow room B. Abstract: http://asa.aip.org/web2/asa/abstracts/search.may11/asa500.html

Intoxicated Speech Reveals Some Surprises

After a few drinks, you may find it easier to strike up a conversation, but that doesn't necessarily mean intoxicated speech is easy or even easy to detect. Researcher Abby Kaplan at the linguistics department at the University of Utah made those unexpected findings while trying to determine if folks who had a few too many tended to slip in easier-to-pronounce sounds fo
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Contact: Charles E. Blue
cblue@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14

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