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+-   Researchers turn tables into finger input surfaces on Saturday November 15 2008, @11:33AM Anonymous Coward

Submitted by Anonymous Coward on Saturday November 15 2008, @11:33AM
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An anonymous reader writes "Researchers at Carnegie Mellon University's HCI Institute have developed a new input technology that allows mobile devices to use surfaces they rest on, like tables, for gestural finger input. This is achieved with some clever acoustics tricks — basically taking advantage of high frequency sound propagation through dense materials. Their video highlights some neat applications, including a home wall based mp3 player (2:10). Further details here, including a link to the academic paper. (Via http://hackaday.com/2008/11/14/scratch-input)"
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