> it is my understanding that interactions between inaudible high
> frequencies may cause "beating" or new tones at lower frequencies
> which are audible - however I also assume the microphone would just
> record these reultant audible frequencies regardless of whether or
> not the inaudible frequencies were removed.
Gus and others,
I don't want to prolong this discussion any further but I will just
add that digitisation is a very non-linear process and that sampling
will generate lower "beat" tones which come out as enharmonic noise or
quantisation noise. A reasonable mic won't do this.
However, I am a pragmatist and it's the results that count, not the
theory. Complex sounds like a bird calls, bat social calls or mammal
squeaks which are far from a sine wave will sound "gravelly" when
played back at slower speeds.
David
David Brinicombe
North Devon, UK
Cogito cogito ergo cogito sum - Ambrose Bierce
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