G.729

G.729 is a royalty-free narrow-band vocoder-based audio data compression algorithm using a frame length of . 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. The wide-band extension of G.729 is called G.729.1, which equals G.729 Annex J.

Key facts

Technology standard.title: G.729
Technology standard.image: Pcm.svg
Technology standard.status: In force
Technology standard.version: (10/17)
Technology standard.version_date: October 2017
Technology standard.organization: ITU-T
Technology standard.committee: ITU-T Study Group 16
Technology standard.related_standards: G.191, G.711, G.729.1
Technology standard.domain: audio compression
Technology standard.license: Freely available
Technology standard.website: https://www.itu.int/rec/T-REC-G.729
Technology standard.long_name

Article

10 sections

Contents

G.729 annexes
G.729 Annex A
G.729 Annex B
G.729 Annex J (G.729.1)
Licensing
Past patent litigation
RTP payload type
See also
References
External links

Because of its low bandwidth requirements, G.729 is mostly used in voice over Internet Protocol (VoIP) applications when bandwidth must be conserved. Standard G.729 operates at a bit rate of , but extensions provide rates of (Annex D, F, H, I, C+) and (Annex E, G, H, I, C+) for worse and better speech quality, respectively.