PSOLA

From Wikipedia, the free encyclopedia

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.

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.

External links

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)

v t e Speech synthesis

Proprietary software	BrowseAloud CereProc DECtalk IVONA Microsoft Agent Microsoft Speech API Microsoft text-to-speech voices Readspeaker Talk It! Voice browser Vocaloid Cantor Voiceroid

Free software	eSpeak Gnuspeech Festival Speech Synthesis System FreeTTS

Shareware	Utau

Machine	Echo 2 Pattern playback Phasor RIAS Texas Instruments LPC Speech Chips TuVox

Applications	AOLbyPhone DialogOS Dr. Sbaitso MBROLA Microsoft Narrator Microsoft Speech Server PlainTalk Voice font

Protocols	Speech Synthesis Markup Language

Developers/Researchers	Catherine Browman Franklin Seaney Cooper Gunnar Fant Haskins Laboratories Wolfgang von Kempelen Ignatius Mattingly Philip Rubin VoiceWeb VoiceXML Yamaha

Process	Articulatory synthesis Concatenative synthesis Currah Inverse filter PSOLA Phase vocoder SABLE Self-voicing

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PSOLA

See also

External links