[PD] Combat aliasing!

Matteo Sisti Sette matteosistisette at gmail.com
Thu Apr 1 00:40:00 CEST 2010

 > Correct, nothing played back at original sampling rate will alias.

It _won't_ alias; it may already _have_ aliased when sampled in the 
first place.

Aliasing occurs when sampling.

When you digitalize (ADC), you are sampling. When generating a waveform 
mathematically, you are sampling the mathematical function at the very 
moment you compute its value at discrete points.

When you play back a signal at a different speed than the original, you 
are _resampling_ it, that is, theorically, interpolating it and then 
sampling it again, and it is the sampling stage, not the interpolating 
one, that produces the aliasing.

The interpolation, since it cannot be an ideal interpolation, may 
introduce other noises or artifacts, not aliasing as far as I can see.

Matteo Sisti Sette
matteosistisette at gmail.com

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