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

ted, as yet there is no agreement on the underlying mechanism or mechanisms that make it audible." The NSMRL researchers investigated potential underlying mechanisms for this phenomenon. One theory is that human beings don't hear the sound itself directly. Transmission-path distortion has been suggested as a possible explanation for ultra-high frequency hearing. According to the transmission-path demodulation theory, the various tissues that the sound passes through in the head modify the ultra-high frequencies down into the audible frequency range. An alternate theory is that, although not its normal response, the human auditory system is able to respond to ultra-high frequency sound via direct inner-hair-cell stimulation. This work is intended to link underwater hearing with bone conduction hearing to determine if they share the same underlying mechanism. Presentation 2pPP3, "Human underwater bone conduction hearing in the sonic and ultrasonic range," is in the afternoon session on Tuesday, May 24 in Metropolitan room B. Abstract: http://asa.aip.org/web2/asa/abstracts/search.may11/asa527.html


Highlights: Wednesday, May 25

Exploring Caves with Sound

Soldiers or emergency rescuers entering a cave will want to know the geometry of that cave. Farther along does the cave widen into a larger chamber or narrow into nothingness? Are there obstructions or holes along the way? David L. Bowen of Acentech Inc. describes a detector his firm has developed that sends planar sound waves into a cave and monitors the return reflected waves with a pair of sensors. By untangling the return times and patterns of the reflected waves, a cave geometry can be computed. The sound source can consist of a subwoofer type of loudspeaker emitting a steady stream of waves or, as used by soldiers in the field, the impulsive sound from a fired gun. A rugged laptop can quickly pe
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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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