G.729
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Latest revision as of 15:41, 29 October 2023
G.729 is a royalty-free narrow-band vocoder-based audio data compression algorithm using a frame length of 10 milliseconds. It is officially described as Coding of speech at 8 kbit/s using code-excited linear prediction speech coding (CS-ACELP), and was introduced in 1996.
- G.729: This is the original codec using a high-complexity algorithm.
- G.729A or Annex A: This version has a medium complexity, and is compatible with G.729. It provides a slightly lower voice quality.
- G.729B or Annex B: This version extends G.729 with silence suppression, and is not compatible with the previous versions.
- G.729AB: This version extends G.729A with silence suppression, and is only compatible with G.729B.
- G.729.1 or Annex J: This version extends G.729A and B with scalable variable encoding using hierarchical enhancement layers. It provides support for wideband speech and audio, using modified discrete cosine transform (MDCT) coding.
[edit] Links
- Homepage
- Wikipedia
- GroovyCodecs - C# G.729 encoder / decoder based on libjitsi/Atlassian code
