From Audacity Wiki
Revision as of 10:51, 6 June 2014 by PeterSampson (removing the description of the compressor parameters in favour of a link to the Audacity Manual Compressor page)
Peter 2May14: ToDo-T This page is a potential candidate for deprecation, the material is, or should be, handled more than adequately in the Manual.
- Gale 02May14: The additional sections for further reading and Chris's Compressor are valuable. Given Chris's family permit downloading of his plug-in and the Manual already links to some third-party software, I have no objection if we moved the additional sections into the Manual.
|Audacity's Compressor effect reduces "dynamic range" by making the loud sections quieter, then optionally amplifies the compressed audio to be as loud as possible without clipping. This increases the perceived overall loudness of the audio.
There are some good (but not too technical) explanations of compression here:
An alternative Free Compressor
- Chris's dynamic compressor by the late Chris Capel is a popular Nyquist plug-in that tries to even out abrupt changes of volume by employing "lookahead" (this attempts to anticipate volume changes by starting to apply compression before the volume rises to the threshold level). There are options to soften the softer audio and invert loudness. See instructions for Nyquist plug-in installation. Several versions of this plug-in may be downloaded.
- An archived 1.1 version of this plug-in can be downloaded by left-clicking this link, then use the browser feature to save the web page in text format. Right-click and "Save Link As" or "Save Target As" may also work in some browsers. Archived documentation can be found here.
- A more advanced 1.2.6 version of this plug-in can be downloaded here.
- Neither of the above versions can be modified or redistributed. We hope to make a freely-licensed version of this plug-in available for separate download later, based on Chris's 1.2.7 Beta version which has a free MIT License. For more information, please visit http://forum.audacityteam.org/viewtopic.php?f=42&t=58958 .