Hi everyone,
I'm trying to figure out the window presum FFT technique (seems to
also go by the name polyphase FFT, time domain aliasing/folding as
well as weighted overlap and add even though the latter is often
simply used as a synonym for the basic windowed overlap and add
method). I've found
As any tutorial/paper/book will teach you, one should apply the window
of choice both before an FFT and after an IFFT (in order to
smooth/taper to signal that might have gone wild due to frequency
domain modifications). The problem is of course that this amounts to
applying a squared window
On Fri, Apr 20, 2012 at 9:23 AM, Domagoj Šarić dsar...@gmail.com wrote:
As any tutorial/paper/book will teach you, one should apply the window
of choice both before an FFT and after an IFFT (in order to
smooth/taper to signal that might have gone wild due to frequency
domain modifications).
Hello,
I haven't read your post in detail but
ps. I've seen this article
http://archive.chipcenter.com/dsp/DSP000315F1.html often being
mentioned as explaining it all but unfortunately the site no longer
exists…
always check archive.org for pages that are gone...
Pre- and post- windows do not have to be identical.
Post-windowing is more about eliminating discontinuities at the ends of
a frame. It has nothing to do with DFT so one doesn't care about the
spectral qualities.
I use Hamming forpre-windowing and {Hann divided by Hamming} for
On Fri, Apr 20, 2012 at 8:15 AM, Domagoj Šarić dsar...@gmail.com wrote:
...but unfortunately all of these however seem to stop at the
analysis stage (i.e. we've gotten a more precise spectrum and that's
all we need). I've wraped my head around the idea itself and the
analysis procedure, I
Have you tried a sine window for both analysis and syntheses yet?
It's used in MPEG according to here:-
https://ccrma.stanford.edu/~jos/sasp/MLT_Sine_Window.html
https://ccrma.stanford.edu/%7Ejos/sasp/MLT_Sine_Window.html
Although I think it's supposed to be 'M-1' instead of M, I'm not sure
On 20 April 2012 14:15, Domagoj Šarić dsar...@gmail.com wrote:
...but unfortunately all of these however seem to stop at the
analysis stage (i.e. we've gotten a more precise spectrum and that's
all we need).
Mark Dolson's CARL phase vocoder
(http://www.crca.ucsd.edu/cmusic/cmusic.html) from
The sine window is exactly the square-root of the Hann. (I've seen Hann
window called square-sine window in some textbooks.)
M or M-1 determine the actual window size (time taken by the window function
to go from 0 to 0, not to be confused with DFT size). If you prefer to use
same window and
Alessandro Saccoia alessandro.sacc...@gmail.com wrote:
http://web.archive.org/web/20060513150136/http://archive.chipcenter.com/dsp/DSP000315F1.html
The images haven't been archived, but you could still find it a useful
reference.
This link includes the images:
On 4/20/12 1:10 PM, robert bristow-johnson wrote:
i wish i could program my Thunderbird client to *not* copy HTML
formatting (like this font change) from the quoted post in replying.
and i wish that music-dsp's Majordomo or whoever would not copy it
either. that said...
No font change came
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