[PD] tabread4~ interpolation at slooow playback?

[Martin Peach]

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 at 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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