[LAD] Paul's Extreme Sound Stretch

[torbenh]

On Thu, Sep 30, 2010 at 07:15:32AM -0400, Dave Phillips wrote:
> Robin Gareus wrote:
> >
> >In layman terms:
> >
> >There's a smart French guy by the name of Joseph F. sitting inside it:
> >If you play him some audio: He thinks: "Hey, this is actually just a few
> >simple sine-waves added together (superpositioned)", he quickly
> >calculates their frequencies and amplitudes and asks "Now, you want to
> >change the duration?" easy: "I'll generate some new sine-waves with
> >these frequencies and amplitudes, how long did you say you want?"
> >
> >(The smart thing about this French guy is that he actually speaks fluent
> >English - Sorry I could not resist :)
> 
> I recall a brief exchange on a DSP list that went something like this:
> 
> Q: Can anyone explain the FFT in simple terms ?
> A. No.
> 
> I have read and understood some articles and descriptions of the
> FFT. Mark Dolson's original article on the phase vocoder (in the
> Computer Music Journal V10,#4, Winter 1986), is still a good
> introduction for computer-based musicians, though it may be a bit
> too technical by contemporary standards.
> 
> Louigi, take a look at some descriptions of what an FFT does. It
> does use "windows" but you'll have to do some homework to find out
> what's meant by the term in this context.
> 
> http://en.wikipedia.org/wiki/FFT

since the FFT is just a fast way to compute the DFT
it might make more sense if you understood the DFT.

understanding why the FFT works, and why its faster is only useful if
you want to use it.

http://en.wikipedia.org/wiki/Discrete_Fourier_transform



> 
> Beware, that page is a maths page, it's not directly concerned with
> the use of the FFT in music/sound applications.
> 
> And btw, I agree wrt Paul's Extreme Stretch, it's a great tool.
> 
> Best,
> 
> dp
> 
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-- 
torben Hohn