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I don't have the necessary details to write the text, but I'm aware that ultrasound modulated with audio is actually naturally demodulated by the human air/ear interface. I have seen this used in phased ultrasound transducer arrays that use the short wavelength of ultrasound frequency to allow wave guiding using a phased array, but an audio signal is modulated in allowing the guided wave to be heard. This is actually used in some surround sound systems where a single source can be used, and the audio is deliberately directed to areas of the room, giving the impression of surround sound. I think this information would be a good addition to this article -- LightYear 12:30, 24 February 2007 (UTC) reply

Article is an old stub with no citations. Neøn ( talk) 06:09, 5 August 2014 (UTC) reply