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TD-PSOLA

Time-domain pitch-synchronous overlap-and-add is a remarkably simple but effective way to independently modify the duration and F0 of speech.
Start with this post, that shows how TD-PSOLA works in practice
TD-PSOLA …the hard way
then move on to the reading

Reading

Holmes & Holmes – Chapter 5 – Message synthesis from stored human speech components

Pitch-synchronous overlap-and-add (PSOLA) remains a key technique in speech signal processing.

and finally the video 21 minutes 37 seconds
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