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Extract data from AIFF file to compute FFT

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Extract data from AIFF file to compute FFT

Subject: Extract data from AIFF file to compute FFT
From: "Francois Baronnet" <email@hidden>
Date: Sun, 3 Aug 2008 22:58:15 +0200

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 frequency.

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 file (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 confused...

Thanks in advance for any help.

--
François Baronnet

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