- Authors:
-
Ragot,
S.
,
Kövesi,
B.
,
Trilling,
R.
,
Virette,
D.
,
Duc,
N.
,
Massaloux,
D.
,
Proust,
S.
,
Geiser,
B.
,
Gartner,
M.
,
Schandl,
S.
,
Taddei,
H.
,
Gao,
Y.
,
Shlomot,
E.
,
Ehara,
H.
,
Yoshida,
K.
,
Vaillancourt,
T.
,
Salami,
R.
,
Lee,
M. S.
,
Kim,
D. Y.
- Book Title:
- Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
- Volume:
- IV
- Pages:
-
p.p.
529-532
- Address:
- Honolulu, Hawai'i, USA
- Date:
-
Apr. 2007
- Language:
- English
Abstract
This paper describes the scalable coder G.729.1 which has been recently standardized by ITU-T for wideband telephony and voice over IP (VoIP) applications. G.729.1 can operate at 12 different bit rates from 32 down to 8 kbit/s with wideband quality starting at 14kbit/s. This coder is a bitstream interoperable extension of ITU-T G.729 based on three embedded stages: narrowband cascaded CELP coding at 8 and 12 kbit/s, time-domain bandwidth extension (TDBWE) at 14 kbit/s, and split-band MDCT coding with spherical vector quantization (VQ) and pre-echo reduction from 16 to 32 kbit/s. Side information consisting of signal class, phase, and energy is transmitted at 12, 14 and 16 kbit/s to improve the resilience and recovery of the decoder in case of frame erasures. The quality, delay, and complexity of G.729.1 are summarized based on ITU-T results.
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