>> I want to split a sound signal into several frequency bands.
> 
>   Why?
> 
>   (Btw, did you know that even if a sound signal has only one single
> frequency, a discrete fourier transform is usually completely unable
> to find that single frequency, and instead will find a large (potentially
> infinite) amount of frequencies around that real frequency?)

I think you just answered the question, right there. :-)

No, in seriousness... I'm playing around with designing an audio codec. 
Most of the ones I've seen are based on chopping the signal into bits, 
taking some kind of Fourier-related transform, selectively removing some 
of the data, and then trying to hide the discontinuities between 
segments. My plan is to seperate a signal into several continuous 
signals, and process those.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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