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In Reply to: RE: Did you know that... posted by BigguyinATL on March 13, 2012 at 06:56:19
"Ultrasonic signal behave nonlinearly in air? that's right, two ultrasonic tones - say 100KHz and 101KHz produce an audible tone at 1KHz!
Air induced distortion - it is also dependent on level or the signals."
You're confusing two different things.
Yes, air is nonlinear - progressively distorting more and more as the SPL is raised.
But, your example is about "beat frequencies" - the periodic alignment/non-alignment of the pressure of two different tones. This can easily be demonstrated by simply singing a tone which is slightly different than the tone on a record, or by listening to the result of two musicians playing the same tone but slightly out of tune.
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