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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.
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What is the math behind "Autotune"? Is there anything open source that could be used to create an "autotune" filter?2 Replies
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) http://en.wikipedia....i/Phase_vocoder http://www.ee.columb...aroD99-pvoc.pdf http://en.wikipedia....ch_modification there are open source FFT libraries: http://www.fftw.org/ for example |
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