NAME
wsola - program to stretch and compress (speed up/slow down) audio
without altering its pitch.
SYNOPSIS
wsola inputFile outputFile factor
DESCRIPTION
wsola speeds up or slows down audio, without pitch alteration. The two
files input/output are accessed using the libsndfile library and thus
may be in many formats supported by libsndfile.
The input argument ’factor’ specifies the output speed of the audio.
Factors > 1 imply slowing of audio. Factors < 1 imply the speeding up
of audio. For example a factor of 0.5 will double the speed of the
audio. A factor of 2.0 will halve the speed of the audio. A factor =
1.0 will leave the audio unaltered.
WSOLA operates using the Waveform Similarity overlap add method [1].
For more information on the signal processing employed by WSOLA please
read the file ’hybridDomainProcessing.pdf’.
AUTHOR
wsola was written by Matt Flax <flatmax@ieee.org>.
REFERENCES
[1] @InProceedings{Verhelst:1993,
author = {Verhelst, W. and Roelands, M.},
title = {An overlap-add technique based on waveform similarity
(WSOLA) for high quality time-scale modification of speech},
booktitle = {IEEE International Conference on Acoustics, Speech, and
Signal Pr ocessing},
pages = {554-557},
year = {1993},
volume = {2},
month = {April} }
December 2, 2004