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Conference Paper
An 8-12 Kbit/S Embedded CELP Coder Interoperable with ITU-T G.729 CIDER: First Stage of the New G.729.1 Standard
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- Authors
- Dominique Massaloux, Romain Trilling, Claude Lamblin, Stephane Ragot, Hiroyuki Ehara, Mi Suk Lee, Do Young Kim, Bruno Bessette
- Issue Date
- 2007-04
- Citation
- International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2007, pp.IV1105-IV1108
- Language
- English
- Type
- Conference Paper
- Abstract
- ITU-T G.729.1 is a scalable coder recently standardized in ITU-T for wideband telephony and voice over IP (VoIP) applications. Composed of three stages, this codec provides a scalable bitstream between 8 and 32 kbit/s both in narrowband and wideband. This paper describes the first stage which is a narrowband embedded CELP coder at 8 and 12 kbit/s. The 8 kbit/s layer ensures interoperability with ITU-T G.729 standard with a reduced complexity, and with a quality better than G.729 Annex A. At 12 kbit/s, G.729.1 reaches the quality level of the 11.8 kbit/s G.729 Annex E in spite of the embedded structure. The modifications brought to the original G.729 scheme to achieve this performance arc explained and formal test results provided. © 2007 IEEE.
- KSP Keywords
- Embedded structure, First stage, ITU-T G.729, Quality level, Reduced complexity, Transmission gate(TG), Voice-over-IP(VoIP), narrowband and wideband