The Sound of Things to Come
By MARSHALL SELLA

No one ever notices what's going on at a Radio Shack. Outside a lonely branch of the electronics store, on a government-issue San Diego day in a strip mall where no one is noticing much of anything, a bluff man with thinning, ginger hair and preternaturally white teeth is standing on the pavement, slowly waving a square metal plate toward people strolling in the distance. ''Watch that lady over there,'' he says, unable to conceal his boyish pride for the gadget in his giant hand. ''This is really cool.''

Woody Norris aims the silvery plate at his quarry. A burly brunette 200 feet away stops dead in her tracks and peers around, befuddled. She has walked straight into the noise of a Brazilian rain forest -- then out again. Even in her shopping reverie, here among the haircutters and storefront tax-preparers and dubious Middle Eastern bistros, her senses inform her that she has just stepped through a discrete column of sound, a sharply demarcated beam of unexpected sound. ''Look at that,'' Norris mutters, chuckling as the lady turns around. ''She doesn't know what hit her.''

Norris is demonstrating something called HyperSonic Sound (HSS). The aluminum plate is connected to a CD player and an odd amplifier -- actually, a very odd and very new amplifier -- that directs sound much as a laser beam directs light. Over the past few years, mainly in secret, he has shown the device to more than 300 major companies, and it has slackened a lot of jaws. In December, the editors of Popular Science magazine bestowed upon HSS its grand prize for new inventions of 2002, choosing it over the ferociously hyped Segway scooter. It is no exaggeration to say that HSS represents the first revolution in acoustics since the loudspeaker was invented 78 years ago -- and perhaps only the second since pilgrims used ''whispering tubes'' to convey their dour messages.
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(Last month, A.T.C. cut a five-year, multimillion-dollar licensing agreement with General Dynamics, one of the giants of the military-industrial complex.)

The Sound of Things to Come