[PD] timestretching for slicer

Derek Holzer derek at umatic.nl
Tue Oct 2 11:07:59 CEST 2007

Time stretching is usually done one of two ways, both of which involve a 
kind of "windowing" of the array: you can use an FFT analysis (of which 
there are examples which come with PD), or you can use granulation.

In general, FFT is more accurate, but more expensive. Granulation is 
used to squeeze the samples in Ableton Live into the BPMs/divisions that 
one wants. It can also be fairly accurate, the smaller the grains, the 
more grains are used and the the more overlaps the grains have.

Check my ParticleChamber abstraction for a use of windowed array 
granulation for time domain manipulation independent of pitch.



F R E N K wrote:
> Hello!
> Thanks to everybody for the quick solutions for the clicking problem... 
> I have a new question, is there a way to perform timestretching on 
> arrays? Or on anything, this would probably be the final step for having 
> a great live slicer!
> thanx!
> Rodrigo
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derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista
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