MrMormon Posted November 17, 2011 Posted November 17, 2011 Ultrasound lasers (sasers?) work because the frequency is high enough to keep sound from spreading out much. I was wondering what would happen if two sasers were pointed at the same spot on a rough but non-absorbing surface? Could the interference patterns of two ultrasonic waves create audible sound from a distance?
swansont Posted November 17, 2011 Posted November 17, 2011 Depends on what you mean by interference. A beat frequency could be audible; this requires the two main signals have a different frequency. You would be hearing the difference frequency.
MrMormon Posted November 17, 2011 Author Posted November 17, 2011 I heard recently that directional speakers already do this. The difference frequencies make the target sound to be heard. I wonder if the speakers could be made portable so one could have a personal ventriloquial device.
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