In digital signal processing techniques PSOLA stands for Pitch Synchronous Overlap Add Method. It's used in speech synthesis. PSOLA This technique's often used in speech processing to change the pitch of a speech signal without affecting its duration. A very simple technique to modify the pitch would be by changing the duration of the speech signal, lengthening it to decrease the pitch and shortening it to increase the pitch. But in PSOLA, The speech waveform's first divided into several small o… (More on Psola)