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Sound research at acoustical society meeting
Date:10/18/2011

[Analysts] get these recordings" often from cell phones or other devices with limited recording capabilities "and they have to try to figure out what's going on. If you don't understand [the impact of] all these variations, you can make the wrong conclusions," Beck said. In a controlled laboratory environment, the researchers placed microphones at a range of angles and distances from each blast, to catch the sound pattern of a single round from multiple points of view. Talk 4aSCa3, "An introduction to forensic gunshot acoustics," is in the morning session on Thursday, Nov. 3.

Abstract: http://asa.aip.org/web2/asa/abstracts/search.oct11/asa760.html

Highlights: Friday, November 4

Vuvuzelas: Earplugs recommended: Vuvuzelas blasted into the publics' ears and awareness during the 2010 FIFA World Cup in South Africa. One immediate question asked was: Do vuvuzelas, those cheap horns commonly made of plastic and blown by enthusiastic fans during sporting events, pose serious risks to hearing? What the Southern Polytechnic State University (SPSU) and Georgia Institute of Technology (Georgia Tech) researchers found is that the sound levels from single horns ranged from 90 to 105 decibels at the players' ears. They also discovered that the horns' impact is greatest when blown simultaneously with many others, such as at the World Cup, where the levels within an audience may well approach 120 decibels. "For perspective, 100 decibels is the level of noise you'd hear at a rock concert. An ambulance siren or pneumatic jack hammer produce about the same level of noise as the vuvuzelas in a stadium, 120 decibels, which is at the threshold of feeling and produces a tickling sensation in your ears," explains Richard Ruhala, associate professor and program director of mechanical engineering at SPSU. "The threshold of pain is 140 decibels. Sustained exposure to 120 decibels is 1000
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Contact: Charles E. Blue
cblue@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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