Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

New Spectrum Interpolation Method for Improving Quality of Synthesized Speech

Takashi Endo, Shun'ichi Yajima

Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan

This paper proposed a new spectrum interpolation method for improving quality of synthesized speech. This method named SSFL(Spectrum Sliding on Formant Loci) overcomes one of the most serious problems in the OLA(Overlapping Addition) method that the continuity of formant loci at a transition part between phonemes is not guaranteed. This discontinuity of formant loci decreases quality of synthesized speech. In the SSFL method, waves are transformed into spectra to interpolate in the spectrum domain and then spectra interpolated are transformed into waves to produce synthesized speech. We have evaluated the proposed SSFL method by synthesizing continuous Japanese speech /aiueo/. The evaluation results have confirmed that the proposed SSFL improved the quality of synthesized speech because it guaranteed the continuity of formant loci.

Full Paper

Bibliographic reference.  Endo, Takashi / Yajima, Shun'ichi (1994): "New spectrum interpolation method for improving quality of synthesized speech", In ICSLP-1994, 1635-1638.