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May I know whether the S-parameters are of low-pass or band-pass filter, if they are relevant to the discussion?


A rectangular prefilter is a sinc(x) in the frequency domain, thus quite far from the text-book brick-wall filter presented in standard discrete sampling. Still, if your (constructed) continous waveform contains no frequency components at >= samplingrate/2 and you can compensate for the high frequency roll off, I would think that near perfect reconstruction ...

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