[PD] FFT convolution with vasp

Thomas Grill gr at grrrr.org
Sat Feb 3 17:03:48 CET 2007

Hi Kevin,
sorry for not anwering earlier - i'm abroad an not very netty at the  
VASP offers non-granular Fourier transformation, which enables non- 
windowed convolution.
Convolution translates to multiplication in the spectral domain,  
therefore just  fourier-transform your two buffers (zero-padded to  
the same size) into the spectral domain, multiply the results,  
transform back, there you go.


Am 02.02.2007 um 19:42 schrieb Kevin McCoy:

> Hello all,
> I would like to hear how some FFT-based convolution sounds with  
> VASP, which claims to leave fewer artifacts than the hann-windowed  
> realtime FFT, but the included example "convolution" does not  
> produce results for me - I load the sound files and send them to  
> the tables via wedit but the final table (I think it's called  
> buf_res) does not receive anything - in other words, no results.
> I'm looking to do something like the "timbre stamp" FFT example in  
> Pd's documentation - I've gotten so many wild and beautiful sounds  
> from running tabread4~ based samples against each other through  
> this, but the quality is not always very crisp.  If anyone has any  
> patches or info, let me know.
> Thanks!
> Kevin
> -- 
> ++++
> http://pocketkm.blogspot.com
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