further infos:

http://www.tedknowlton.com/resume/FFT_Bin_Interp.html
http://sigpromu.org/brett/elec2400/matlab3.pdf
http://www.eng.tau.ac.il/~yaro/RecentPublications/ps&pdf/EfficientSincInterpolation_ApllOpt.pdf
http://www.eng.tau.ac.il/~yaro/RecentPublications/ps&pdf/sinc_interp.pdf

tito

On Fri, Nov 18, 2011 at 09:39:57AM -0200, luis jure wrote:
> 
> on 2011-11-17 at 08:50 Richard Dobson wrote:
> 
> >"The window is assumed to be symmetric with M total points.  After the 
> >initial memory allocation, analWindow always points to the midpoint of 
> >the window (or one half sample to the right, if M is even); analWinLen
> >is half the true window length (rounded down). Any low pass window will 
> >work; a Hamming window is generally fine, but a Kaiser is also 
> >available.  If the window duration is longer than the transform (M > N), 
> >then the window is multiplied by a sin(x)/x function to meet the 
> >condition: analWindow[Ni] = 0 for i != 0."
> 
> 
> i see... things are more clear now, although i can't say i fully
> understand the rationale behind the technique. definitely a twist compared
> with the "plain" phase vocoder techniques i was more or less familiar with.
> 
> thanks for the clarifications, richard!
> 
> lj
> 
> 
> (perhaps a summarized version of this information could make its way into
> the manual?)
> 
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
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