Gregor Möhler
PSOLA Module for CHATR
Abstract:In this work a signal processing module is presented that can deal with mismatches
between the target specifications and the features of a selected unit in concatenative speech synthesis. Due to finite database length a selected unit will not necessarily meet its target specification in F0 and duration. However, in prosodically important parts of speech such a mismatch cannot be accepted. The described module modifies the synthesized sentence in F0 and duration based on the Pitch-Synchronous-OverLap&Add (PSOLA) algorithm. Different approaches of how to
apply the algorithm to the selected units are discussed and details of the implementation are described. Finally, a proposal is given of how to apply the algorithm with varying prosodic relevance over the utterance.