>  (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?)

It just depends how many samples you use for your fourier transform, the 
more samples you take, the more accurately you can divide up the frequency 
spectrum.  If you have a couple of seconds of normal audio recording (so 
like 100k samples), you should be able to find a single frequency pretty 
accurately, certainly to within 1 Hz.

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