Not sure if this helps but there is a very good tutorial on the FFT at
2008/8/3 Francois Baronnet <email@hidden>:
> Hi all,
> I'm willing to develop some tuning tool (guitar & ukulele) for iPhone.
> I'm facing some issues with the record part: I'd like to record sound for 2
> or 3 seconds (this part is ok) and then extract from it the principal
> Some people said to me to compute the Fast Fourier Transform.
> Reading this mailing list I found how to find sound data chunks in some AIFF
> (here: http://lists.apple.com/archives/coreaudio-api/2003/Feb/msg00244.html).
> But one point is missing: in all theses chunks of sound, what do I should
> send to my FFT function? I heard of arrays of complex numbers, but I'm a bit
> Thanks in advance for any help.
> François Baronnet
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