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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. |