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CELT

NameCELT
OwnerXiph.Org Foundation
GenreAudio
ContainedbyOgg
ExtendedtoOpus

CELT

Software information
DeveloperXiph.org Foundation, Jean-Marc Valin
Preview release0.11.1
Preview release dateFebruary 15, 2011(age 5)
Operating systemCross-platform
TypeAudio codec, reference implementation
License2-clause BSD
Websitecelt-codec.org

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CELT (Constrained Energy Lapped Transform) is an open, royalty-free audio compression format and a free software codec for use in low-latency audio communication. It is a lossy codec, meaning quality is permanently degraded to reduce file size.

CELT is meant to bridge the gap between Vorbis and Speex for applications where both high quality audio and low delay are desired. It is suitable to carry both speech and music. It borrows ideas from the CELP algorithm, but avoids some of its limitations by operating in the frequency domain exclusively.

The first development version of CELT was published in December 2007.

In July 2009 the CELT codec was submitted as an IETF draft. In May 2009, a draft of RTP payload format for the CELT Codec was published. In September 2010 a draft of the Opus codec which uses SILK and CELT was submitted to the IETF.

As of February 2011, the CELT bitstream is considered to be in a "soft freeze" indicating that it is fixed but there may still be bugs lurking that require it to be changed in the future.


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