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RE: Chord up-samples?

Digital signal processing technology often is non-intuitive. One such confusing area is the 'altering' of sample values via digital filtering. While a digital reconstruction filter does indeed create new output sample values, these are mathematically derived from and correlated with the input samples. When a digital filter changes the output sample values it is akin to what happens when an analog filter changes the characteristics of an analog signal. We don't view the analog filter as corrupting the signal. Likewise, we shouldn't view the digital filter as improperly corrupting the original samples simply because their values are being changed. That is what filters do, whether digital or analog, they alter the signal fed them. The notion that this somehow represents an corruption or improper degradation is wrong.
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Ken Newton

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