[PD] FFT analysis window questions

[Joseph A. Sarlo]

You can find a whole family of windowing function Pd objects at

http://crca.ucsd.edu/~jsarlo/pd/

Joe
jsarlo at ucsd.edu



----- Original Message -----
From: <julien.breval at tremplin-utc.net>
To: <pd-list at iem.at>
Sent: Saturday, November 15, 2003 12:16 PM
Subject: [PD] FFT analysis window questions


Hello

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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