Projects / CELT audio codec

CELT audio codec

CELT (Constrained Energy Lapped Transform) is an ultra-low delay audio codec designed for realtime transmission of high quality speech and audio. This is meant to close the gap between traditional speech codecs (such as Speex) and traditional audio codecs (such as Vorbis).


Recent releases

  •  15 Feb 2011 13:17

    Release Notes: This version fixes two minor bugs with 0.11 that affect the bit-stream. The quality should improve (very) slightly, but not enough to be noticeable in most cases. Several Opus-related bugs have also been fixed.

    •  23 Dec 2010 18:38

      Release Notes: This release brings many quality improvements, mostly through better bit allocation. It also fixes many bugs and regressions, most notably with VBR support. The bit-stream is not compatible with version 0.9.x.

      •  16 Nov 2010 15:17

        Release Notes: This release fixes the PLC that was broken in 0.9.0. No other changes were made beyond that. The bit-stream is compatible with 0.9.0.

        •  06 Nov 2010 12:04

          Release Notes: This release mainly focuses on quality improvements. The transient handling code has been greatly improved and high-frequency artifacts have been reduced. There have also been lots of small improvements from better tuning of various parameters.

          •  13 Jul 2010 21:19

            Release Notes: This release fixes some bugs introduced in 0.8.0. The bit-stream remains compatible with 0.8.0, with the caveat that CELT no longer supports frame sizes that have prime factors larger than 5. This should not affect any reasonable application.


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