A Novel Approach to Reduce Average Spectrum Distortion in Pitch Alteration Technique Using Gaussian Method

摘要

In case of speech synthesis, Intonation plays an important role. Intonation is the variation of pitch. It is used for a range of functio ns such as indicating the attitudes and emotions of the speaker, signaling the difference between statements and questions, and between different types of question, focusing attention on important elements of the spoken message and also helping to regulate conversational interaction. To alter the pitch, Pitch Synchronous Overlap and Add technique (PSOLA) can be used. But, in the PSOLA techniq ue, applying symmetric window function to asymmetric speech waveform causes energy unbalance pheno menon. This energy unbalance can be overcome by the time-frequency conversion of asymmetric waveform to symmetric. But this conventional method lead s to more spectrum distortion. So, we propose a new Gaussian method which can reduce the spectrum distortion over conventional method