Magazine article ASEE Prism

Tiny Speakers, Big Sound

Magazine article ASEE Prism

Tiny Speakers, Big Sound

Article excerpt

Forget about bookshelf speakers. How about flyspeck speakers - A pair of engineers at England's University of Warwick had devised a technology that will enable manufacturers to build speakers no more than a centimeter wide yet that can fill a room with sound. Roger Green, an electronics engineer and communications specialist, and David Hutchinson, an ultrasound expert, have come up with a means of producing audible sound from ultrasonic wavelengths. Since ultrasonic sounds are beyond the human capacity for hearing, that's a pretty cool trick. And trick is the right word because Green and Hutchinson's speakers merely fool us into thinkg we hear the sounds. They desigued transducers that synthesize ultrasonic sounds that our brains detect, but we are not really hearing without our cars - we just think we are. If that sounds, well, weird, one need only look to a TV set to be similarly fooled. As Green explains, TV viewers perceive continuous moving images in all colors. …

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