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Re: Nope

The question is what does the data look like *between* the upsampling (numerator) and downsampling (denominator)? I'm certain this is **not** trivial. It's very critical. The most critical part of such conversion.

If zero-stuffing actually takes place in the upsampling (with no further calculation before downsampling) that intermediate data would be a zero signal with periodic spikes of the original signal. This is the signal that would then be downsampled. But the downsampling just cannot "restore" that signal.

I think the root of the misconception the notion of filtering and oversampling being two separable or different things. But they're not. The oversampling is where the filtering takes place. Oversampling *is* the digital filter.

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