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AurioTouch & FFT for an instrument tuner

I am working on one app in which i need to do the spectrum analysis of the incoming audio sounds. I am new to it only thing i know is that i need to use the FFT. I looked in to the aurio touch app but couldn't understood it. if any one have sample code or simple way so that i can do it please let me know. Thanks in advance.

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  • There are **lots** of questions and answers on SO already about this subject - try searching for "aurio", "FFT", "Hanning", "power spectrum", etc – Paul R Apr 06 '11 at 20:29
  • Many duplicates, e.g. [AurioTouch & FFT for an instrument tuner](http://stackoverflow.com/questions/1447059/auriotouch-fft-for-an-instrument-tuner) and [calculating frequency with apple's auriotouch example](http://stackoverflow.com/questions/4856654/calculating-frequency-with-apples-auriotouch-example) and [Determining what frequencies correspond to the x axis in aurioTouch sample application](http://stackoverflow.com/questions/2949893/determining-what-frequencies-correspond-to-the-x-axis-in-auriotouch-sample-applic)... – Paul R Apr 06 '11 at 21:13
  • ...and [Do you know a good and efficient FFT?](http://stackoverflow.com/questions/1592345/do-you-know-a-good-and-efficient-fft) – Paul R Apr 06 '11 at 21:18

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