Quote:
Originally Posted by Quoth
Sampling at many times the final sample rate allows for a simpler analogue pre-filter as there must be no input above 1/2 the sample frequency. This also allows more content up to the sample frequency as an analogue filter can't be like a cliff. It's not a sharp cut off. Then the input can be digitally filtered to 1/2 the final sample rate.
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Most recording studios work this way - much higher sampling rate for recording and mixing, then a decimation filter to reduce the sampling rate.
Because offline digital filters don't have the be causal, it's easier to get a sharp cutoff without nasty phase distortion.