[PD] Max Smoother Audio than Pd?

cyrille henry ch at chnry.net
Sun Mar 28 23:18:36 CEST 2010

Claude Heiland-Allen a écrit :
> Alexandre Porres wrote:
>> "I feel Max produce a smoother audio than Pd. Didit"
> Well, if you use [tabread4~] or any of the many other Pd objects that 
> use the same broken interpolation algorithm (copy/paste programming), 
> you get horrible noise.  If you use [tabread4] to interpolate graphical 
> parameters for animations, the discontinuities in the derivatives are 
> really obvious.
> See attached patch - it would be interesting to see if a Max/MSP port of 
> this patch exhibits the same problem.

well, the cos~ object does not internally use a 4 points interpolation.
see code : 
*out++ = f1 + frac * (f2 - f1);
it's a 2 points linear interpolation.

> nusmuk audio tabread4c~ uses the correct interpolation algorithm, 
> correct me if I'm wrong.
i don't think there is a correct interpolation algorythm.
I heard that software like reaktor use very diferent algorythm, with lot's more points, in order to have a band limited interpolation.


> See also this long discussion:
> http://lists.puredata.info/pipermail/pd-list/2008-06/062878.html
> Claude
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