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by XorNot
460 days ago
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It's not theoretically impossible but it is completely impractical to engineer such a thing - destructive interference has to be precisely matched to cancel out a sound, and if it's not you just get "beats" as the phases overlap. And that match depends on matching frequency and distance - or having a very fast tuning system, and then you've got to do all this in a device that's not just another LRAD (at which point you're back to "the best defense is a good offense"). |
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