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6 years ago
Disclaimer: I always use 44.1 or 48 KHz for all the reasons cited so far.Devil's advocate:Indeed we can't hear that top octave, but say you have 2 violins that each produce supersonic waves. When they play simultaneously, the airborne summing of their sounds could perhaps create undertones that are indeed within the audible range.
Disagree - the airborne summing of their sounds is simply amplitude summation. That cannot, and will not, produce sum and difference frequencies. For that to occur, there must be a non-linearity to provide sum and difference frequencies. I don't know of any common acoustic phenomenon that would produce said non-linearity.
by capturing this supersonic information and then mixing it in electronic equipment (before or after recording) you can potentially PRODUCE sum and difference tones that would not have been present had those sounds combined acoustically in the air and been listened to in that environment (i.e. without being recorded or manipulated with non-linear electronic equipment).
Sum and difference (beat) frequencies that occur in the atmosphere are audible at the ear mainly because the ear's non-linearity is what allows them to occur. However, this requires that both frequencies that are beating with each other be audible. If the ear can't respond to one of them then it is highly unlikely the listener will perceive the sum or difference tones to any significant degree.
Some loudspeakers use sum/difference of supersonic sound to create audible sound. This allows the loudspeakers to be exceedingly directional.
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