Sixth International Conference on Spoken Language Processing
(ICSLP 2000)

Beijing, China
October 16-20, 2000

A Unified View on Synchronized Overlap-Add Methods for Prosodic Modifications of Speech

Werner Verhelst, Dirk van Compernolle, Patrick Wambacq

ESAT/PSI, Katholieke Universiteit Leuven, Belgium

We present several synchronized overlap-add methods for prosodic modification of speech in a unifying framework. The discussion starts by exploring time-scale modification based on the short-time Fourier transform and proceeds to review an iterative phase reconstruction method for time-scaled magnitude spectrograms. The search for a good initial phase estiniate leads to waveform.synchronized overlap add methods for time-scaling of speech, in particular SOLA and WSOLA. Pitch modification is made possible when pitch-synchronized overlap-addition is applied to wideband short-time Fourier transforms, as is the case with current techniques like PSOLA, PIOLA, and MBROLA. All these prosodic modification methods essentially perform some form of automatic editing of the speech waveform in the time domain. Therefore, they can be computationally efficient and at the same time maintain a natural sound quality.

Full Paper

Bibliographic reference.  Verhelst, Werner / Compernolle, Dirk van / Wambacq, Patrick (2000): "A unified view on synchronized overlap-add methods for prosodic modifications of speech", In ICSLP-2000, vol.2, 63-66.