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What is the math behind "Autotune"? Is there anything open source that could be used to create an "autotune" filter?
Asked by tmo9d
Posted Sep 23 2009 01:51 PM
I'm addicted to "I Am T-Pain" on the iPhone. How does the autotune algorithm work, and is there any way this application could be recreated using open source libraries. I see that it uses Antares Audio Technologies behind the scenes.
Answered by punkgenius
Posted Nov 04 2009 08:56 AM
The autotune(pitch correcting) function by Antares is actually pretty common (it's available in Apple's Garage Band software, for example).
In the audio industry, this is called a phase vocoder and is based on FFT (at least a forward and an inverse FFT)
there are open source FFT libraries: http://www.fftw.org/ for example