---
name: "wsola"
section: "1"
platform: "linux"
package: "wsola"
version: "4.9-2.1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/wsola"
---

# wsola(1)

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} }