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Old 01-14-2021, 12:41 PM   #12
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Join Date: Aug 2008
Posts: 37

Originally Posted by Ozman View Post
NI Form uses PSOLA.
Great for some things, but really alters some sounds.
So the thing about PSOLA is that it smudges and colors the sound a lot. The AT patent says that the "overlap" part is not necessary; just advance the delay read head if we're flat, and retard it if we're sharp. And if we run out of room? We know exactly how long one cycle is, so just jump back by that many samples. No multiply-adds, no spectral voodoo magic, dead simple. Definitely a hell of a lot simpler than the "phase vocoder" approach I sometimes see being associated with autotune.
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