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RE: Chord up-samples?

"What is the interpolating filter really doing? It's outputting sample values *as if we had sampled the original signal at the new higher rate in the first place*"

This is the very thing a lot of digital audio sales ads want unsuspecting consumers to believe..... (This has been going on for over 20 years.) But resolution cannot be improved beyond that of the original data on the media.

The interpolation filter in essence "connects the dots" between the original samples. In a way which preferably doesn't corrupt the original signal. In the frequency domain, the filter removes frequency reflections beyond half the sample rate frequency.

The oversampling is simply the digital application of filtering. (An analog application would be to add an LCR circuit following non-oversampled conversion.) It cannot enhance resolution.

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  • RE: Chord up-samples? - Todd Krieger 19:23:31 06/21/17 (0)


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