Levelator

The Levelator is a software application that makes adjustments to audio signals.

Publication

The Levelator was a free application distributed by The Conversations Network and developed by Bruce and Malcolm Sharpe, Norman Lorrain and Doug Kaye. Originally distributed by GigaVox Media, Inc (a for-profit company), the rights were transferred to The Conversations Network (a California 501(c)(3)) in 2008. The underlying code was originally used only for The Conversations Network's own podcasts but was subsequently released to the public, free for commercial and non-commercial use. It was unveiled to the public at the first Podcast and New Media Expo in 2005. The adjustments and drag-and-drop workflow of the Levelator makes it a valuable tool for professional and non-professional broadcasters and podcasters.

As of the end of 2012, the Levelator is no longer supported or being updated by The Conversations Network. Conversations Network ceased daily operations at the end of 2012.^[1]

When OS X 10.11 (El Capitan) was released, the Levelator was found to be incompatible. The original development team, Bruce Sharpe, Norman Lorrain and Doug Kaye collaborated in November 2015 to develop an OS X-only compatible release 2.1.2. ^[2]

Functioning

The Levelator adjusts the audio levels within an audio segment by combining traditional discrete compression, normalization and limiting processing. By taking a global view of the data in various time segments (both long and short), the Levelator automatically balances various audio levels, such as multiple microphone levels in an interview or panel discussion, or segments combined from multiple sessions that were recorded at different levels. The Levelator can read and process PCM audio files of many sample rates and resolutions.

The Levelator reads the original audio file and creates a new audio file with balanced levels and a uniform overall volume level that is then saved in the same format as the original, but with ".output " added to the file name. Only PCM audio source files are supported (most major file formats, including WAV and AIFF). Lossy compressed audio is not supported, encouraging use of The Levelator at the correct point in the production chain - i.e. before lossy encoding to the delivery format such as MP3.^[3]

Example of Levelator

Screenshot of before and after renderings of an audio sample adjusted by the Levelator is seen in Audacity.

See also

Audio normalization

References

1. ↑ "The Levelator® from The Conversations Network". Web.archive.org. 1999-02-22. Retrieved 2014-03-28. 
2. ↑ "The Levelator® from The Conversations Network". The Conversations Network. 2015-11-30. Retrieved 2015-11-30. 
3. ↑ "The Levelator® Loudness Algorithms". The Conversations Network. Retrieved 1 April 2015. 

External links

• Conversations Network The Levelator Homepage
• Podcast Academy Interview with Bruce Sharpe