PSOLA (Pitch Synchronous Overlap and Add) is a digital signal processing technique used for speech processing and more specifically speech synthesis. It can be used to modify the pitch and duration of a speech signal. It was invented around 1986.
PSOLA works by dividing the speech waveform in small overlapping segments. To change the pitch of the signal, the segments are moved further apart (to decrease the pitch) or closer together (to increase the pitch). To change the duration of the signal, the segments are then repeated multiple times (to increase the duration) or some are eliminated (to decrease the duration). The segments are then combined using the overlap add technique.
PSOLA can be used to change the prosody of a speech signal.
- Grazyna Demenko (1999). Analiza cech suprasegmentalnych jezyka polskiego na potrzeby technologii mowy (PDF) (Ph.D. thesis). Seria Jezykoznawstwo Stosowane. 17. Uniwersytet Im. Adama Mickiewicza W Poznaniu. Fig.7.1, p.63.
- Charpentier, F.; Stella, M. (Apr 1986). "Diphone synthesis using an overlap-add technique for speech waveforms concatenation". Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP'86. 11: 2015–2018. doi:10.1109/ICASSP.1986.1168657.
- Changing Pitch with PSOLA for Voice Conversion
- A thesis that discusses PSOLA with diagrams (PDF format; see page 35, which is page 44 of the PDF)
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