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Which filter artifacts can be eliminated without trade-off?, (in a universe where computing power comes free)
post Apr 3 2012, 08:04
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I'm learning, please correct any of the following sentences, if the aren't correct:

  1. We cannot eliminate ringing, just choose where we want it (pre-, post-).
  2. We can minimize ripple by computing power (choice of windowing function) without quality trade-off.
  3. Aliasing in resamplers can eventually only be controlled by passband width and filter steepness (dependency to 1).

If 3 is true, why does the SoX offer a dedicated "allow aliasing" option besides bandwidth and steepness?
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post Apr 3 2012, 12:13
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QUOTE (googlebot @ Apr 3 2012, 08:04) *
[*]We cannot eliminate ringing, just choose where we want it (pre-, post-).
Well, you can reduce it by having a more gentle roll off. That's probably stating the obvious though.

It doesn't need to introduce more aliasing - it can sacrifice more of the frequencies below Nyquist.

You may find this thread interesting...

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