Theoretically you should use a brickwall lowpass at one half the playback sample rate. So practically a multipole lowpass at a lower frequency than that.
Martin
On Sat, May 30, 2015 at 1:37 PM, Peter P. peterparker@fastmail.com wrote:
Dear list,
this has been discussed already, but I would need a best-practice advice. I am trying to play back a 44.1kHz sound file with tabread4~ at very slow speed. I do get interpolation noise in the higher audible range of course. Now I tried to resamples the sound file to 96kHz, place it in an oversampled sub-patch and applied the 15kHz anti-alias filter from the J07.oversampling.pd example before its outlet~.
I am aware that interpolation noise and aliasing are different things, but I was under the impression that a higher samplerate would help tabread4~ to do better interpolation?
I also had a look at tabread4c~ from the nusmuk externals, but it produced very similar artifacts.
Is there any way how to reduce the interpolation noise? Could I use a low-pass filter whose cutoff frequency I could adapt wrt. playback speed?
Thank you for all ideas, this is really appreciated! P
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