People might find this page of interest. I did it as a demo of the effects
of resampling in a different context. In particular to show how the
'recipy' used for resampling and the choice of reconstruction filter
altered the results.

http://www.audiomisc.co.uk/software/...psampling.html

Here I used noise as the test input so the main effect shows up as the
creation of the 'out of band' components that weren't in the source
material. But if the test input is something like a pair of tones you can
also see anharmonics folded down into the audible range.

You can reduce these effects by having better filtering. But you can't
actually make them always absolute zero in practice.

Jim

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