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"God spoke to me" posted by Animats (122034) on /.

With the Holosonics Audio Spotlight [holosonics.com], you can now make people think God is talking to them! Range from 20 to 200 meters. And the speaker is just a flat black disk about a foot in diameter.

It's really clever. It works by projecting audio as two ultrasonic signals, which produces a very narrow beam. You can't hear the ultrasonic components, but the difference between them becomes audible some distance from the speaker, because air isn't entirely a linear medium. Some museums now use these things, so that the recorded message for a display is only audible in a small area. We're going to be seeing more of these very soon; the price is about to drop.

So if you hear voices in your head, start looking around for 1' diameter disks pointed in your direction. Move around a bit; the beams are very narrow.

20051111