Popular Science

December 1997


Best of What's New

10th Annual

Sound Projectors

The Hypersonic Sound Speakers developed by American Technology Corp. produce a pair of ultrasonic signals beyond the range of human hearing. When the two signals interact, they produce a third wave that can be heard. The effect is startling: You can't hear the audio until it strikes an object--so if the speaker is aimed at you, the sound seems to be in front of you. Target the speaker across the room and the sound will seem to originate from there--now, that's really being surrounded by sound.

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Revised: September 29, 2005