Applying overlap-add techniques to pitch period waveforms allows the modification of F0 and duration without changing the phone identity. Note: we will talk a bit more about unit selection in the lecture, specifically target and join costs, but not the actual algorithm for selection (the Viterbi algorithm – though we will come back to this in the ASR modules).
October 18, 2014
TD-PSOLA …the hard way
Time-Domain Pitch Synchronous Overlap and Add (TD-PSOLA) can modify the fundamental frequency and duration of speech signals, without affecting the segment identity – that is, without changing the formants. Normally, it’s an automatic algorithm, but here we do it the hard way – by hand! If you want to follow-along, you will need Audacity and these materials (a […]
