Sorry to be the audio-geek voice of reason here...djluminalFebruary 22 2008, 19:58:47 UTC
But that is faulty science.
Rebroadcasting a duplicate phase-shifted signal back towards the source would simply cancel out the sound of the speakers, as long as atmospheric conditions allowed the duplicate signal to arrive back at the source without too much coloration. That's how noise-cancelling headphones work, and it is essentially the same theory which allows stealth helicopters to fly nearly silently (you don't hear the noise of the rotors, but you still feel the wind).
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Rebroadcasting a duplicate phase-shifted signal back towards the source would simply cancel out the sound of the speakers, as long as atmospheric conditions allowed the duplicate signal to arrive back at the source without too much coloration. That's how noise-cancelling headphones work, and it is essentially the same theory which allows stealth helicopters to fly nearly silently (you don't hear the noise of the rotors, but you still feel the wind).
Still a cool idea, though ;-)
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