An overlap-add technique based on waveform similarity (WSOLA) for high quality time-scale modification of speech

Authors:
Werner Verhelst;Marc Roelands
Affiliations:
Vrije Universiteit Brussel, Faculty of Applied Science, Dept. ETRO/DSSP, Brussels, Belgium;Vrije Universiteit Brussel, Faculty of Applied Science, Dept. ETRO/DSSP, Brussels, Belgium
Venue:
ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: speech processing - Volume II
Year:
1993

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Abstract

A concept of waveform similarity is proposed for tackling the problem of time-scale modification of speech, and is workedout in the context of short-time Fourier transform representations. The resulting WSOLA algorithm produces high quality speech output, is algorithmically and computationally efficient and robust, and allows for on-line processing with arbitrary timescaling factors that may be specified in a time-varying fashion and that can be chosen over a wide continuous range of values.