[PD] tabread4~ interpolation at slooow playback?

[Miller Puckette]

I think the playback patch should be at whatever rate the dac is running at,
and in this case filtering won't fix teh problem.

Most likely the upsampling from 44k1 to 96k wan't done perfectly.  I use
Julius Smith's "resample" program which I think is quite trustworthy.

cheers
Miller

On Sat, May 30, 2015 at 01:51:58PM -0400, Martin Peach wrote:
> 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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