man wsola (Commandes) - program to stretch and compress (speed up/slow down) audio without altering its pitch.
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} }