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RE: Chord up-samples?

Yes, that's correct. The image bands are still present, which is indicated by the fact that the D/A output still exhibits an stair-stepped appearance, except with finer granularity steps after oversampled digital interpolation is applied. Since the image bands are shifted up in frequency by a multiple of the oversampling ratio the residual image bands are mor easily removed via analog final filtering. Also, as I recall, the SinX/X frequency domain masking effect of zero-order-hold (stair-stepped) D/A unit operation inherently suppresses the oversampled interpolation image bands more effectively than it was before oversampled interpolation.

My DSP explanations intended for the lay person aside, I mostly jumped in to counter the commonly expressed notion that since digital interpolation changes the data sample values, it necessarily corrupts the pristine signal captured by the original data values. That is an (intuitive) analog signal domain processing notion, which has nothing to do with (often non-intuitive) digital signal domain processing.
_
Ken Newton


Edits: 06/20/17 06/20/17 06/20/17
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