[PD] FFT analysis window questions

julien.breval at tremplin-utc.net julien.breval at tremplin-utc.net
Sat Nov 15 21:16:17 CET 2003


I am currently working on phase vocoders, and I have two questions about the 
FFT in Pure Data

(1) When I use a [block~ 4096 8],
* the size of the FFT (~ number of analysis frequency bands) is 4096 and the 
overlap is 8
* do the parameters of the [block~] object have an influence on the analysis 
window size ? I mean, is it possible to use a window size of 1024 samples and 
an FFT size of 4096 ?

(2) Blackman / Blackman Exact / Blackman-Harris windows  

I would like to use this kind of analysis windows, but I don't even know their 
mathematical formula ; does anyone know how to implement these under Pure Data, 
in the same way as the Hanning window is already implemented in most example 
patches ? (or the mathematical formulas at least) 

THank you very much

PS : the phase locking vocoder example patch is truly good. Has anyone ported 
it to Max/MSP ?

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