4 ms·
FFT is a pretty cool thing. But yeah, this "trick" has been used for correlation-based computations for quite awhile. Assuming that it's the trick that the aut
by thearn4 9y ago
FFT is a pretty cool thing. But yeah, this "trick" has been used for correlation-based computations for quite awhile.
Assuming that it's the trick that the author was referring to, the article is actually a bit sparse on details.
- soundwave106 9y agoThe patent for Autotune can be found here: https://www.google.com/patents/US5973252?dq=5,973,252 https://www.google.com/patents/US5973252?dq=5,973,252 My (very non-expert) reading of the patent is that it uses sample reduction and some specific features of the periodic form of the human voice to simplify the math involved in the auto-correlation routine. Although this routine does seem to be unique as far as I know, I wouldn't be surprised if it shares similarities to other techniques to reduce correlation complexity.
- hamiltonkibbe 9y agoPolyphase filters maybe? It's an approach used primarily in resampling, and its an easy way to skip a LOT of Multiply-by-zero-and-Accumulate-ing
- nejenendn 9y agoIt decoded to a phase vocoder on the nearest semitones.
- dspig 9y agoread the patent - all time domain, no phase vocoder involved.
- amelius 9y ago> “I realized that most of the arithmetic was redundant, and could be simplified,” he says. “My simplification changed a million multiply adds into just four.” Doesn't sound like FFT.