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DSP Granular Guitar


viscera
Feb 12 2011 | 12:29 am

Hi everyone!,
I process my guitar, and i´ve being experiencing with all the DSP. And now i want to do some granulate things, but i don´t know wich is the better way or the better object to do it in real time.
Thanks so much!
All the best.


brendan mccloskey
Feb 12 2011 | 2:42 pm

Hi viscera
broadly speaking there are two types of ‘granulation’:

Granular synthesis processes simpler waveforms by creating clusters of grains of varying amplitude and envelope, thereby introducing new frequencies; almost a highly sophisticated form of amplitude modulation synthesis. If you wish to effect granular synthesis on single pre-recorded (or live) guitar pitches, these would be the ‘simpler waveform’. ‘Granulation’, as the other term, often refers to the chopping up of a longer soundfile, to extrapolate existing timbres/transients, with independent control over pitch and duration. The objects you should look at are [buffer~] plus [grooveduck] or [play~]; the shortest route to window/envelope shapes is either [trapezoid~] or [curve~]. A vital object is [poly~]. Thes two types of granulation/granular synthesis are hereby achieved in the TIME DOMAIN.

Alternatively, you could look at FREQUENCY DOMAIN granulation, which provides arguably cleaner results (but do check out Cycling74/examples/sampling/granular); everyone goes here for the best examples of frequency spectrum manipulation:

http://cycling74.com/toolbox/charles-spectral-tutorials/

To fill a buffer in realtime, look at the patch below.

Brendan

— Pasted Max Patch, click to expand. —

ps
here’s my own (late) contribution to this well-established practice:

http://www.youtube.com/watch?v=QPNBPFAUDoM


thouldcroft
Feb 12 2011 | 5:57 pm

There’s also a great toolkit for granular synthesis/granulation called (fittingly) The Granular Synthesis Toolkit. You can find it here: http://www.nathanwolek.com


viscera
Feb 12 2011 | 6:34 pm

Thanks much guys! so helpful.
All the best.

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