adamdea;689124 Wrote: > I am not really sure what you mean by 1)except as a corollary of 3). > 1) is different from 3) because the low pass effect will affect the baseband signal: a convolution of a square pulse with perfect dirac pulse train in the time domain corresponds to multiplying the signal in the frequency domain by a very poor sinx/x lowpass filter. This has nothing to do with the reconstruction filter used for 3): this is a lowpass distortion BEFORE reconstruction, that is definitely altering the baseband signal in an extent inversely proportional to the square pulse width.
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