The Seventh ISCA Tutorial and Research Workshop on Speech Synthesis

Kyoto, Japan
September 22-24, 2010

Exploration of the Other Aspect of Vocoder Revisited: A-Z STRAIGHT, TANDEM-STRAIGHT and Morphing

Hideki Kawahara

Faculty of Systems Engineering, Wakayama University, Japan

This article presents a tutorial information about STRAIGHT and TANDEM-STRAIGHT, a widely used speech modification tool and its successor as well as their application for speech morphing. They share the same concept that periodic excitation found in voiced sounds is an efficient mechanism for transmitting underlying smooth time-frequency representation. They also based on perceptual equivalence of two sets of independent Gaussian random signals. These made it possible to discard input phase information intentionally and enabled flexible manipulation of parameters.

Index Terms: speech synthesis, spectral analysis, vocoder, morphing, periodicity

Full Paper

Bibliographic reference.  Kawahara, Hideki (2010): "Exploration of the other aspect of vocoder revisited – a-z STRAIGHT, TANDEM-STRAIGHT and morphing", In SSW7-2010, 32-37.