Paper Info
Title
Bandwidth Extension for Hierarchical Speech and Audio Coding in ITU-T Rec. G.729.1
Abstract
Recommendation G.729.1 is a new ITU-T standard which was approved in May 2006. This recommendation describes a hierarchical speech and audio coding algorithm built on top of a narrowband core codec. One challenge in the codec design is the generation of a wideband signal with a very limited additional bit rate (less than 2 kb/s). In this paper, we describe the respective codec layer, which extends the transmitted acoustic bandwidth from the narrowband frequency range (50 Hz-4 kHz) to the wideband frequency range (50 Hz-7 kHz). The underlying algorithm uses a fairly coarse parametric description of the temporal and spectral energy envelopes of the high frequency band (4-7 kHz). This parameter set is quantized with a bit rate of 1.65 kb/s. At the decoder side, the high-frequency components are regenerated by appropriately shaping a synthetically generated ldquoexcitation signal.rdquo Apart from the algorithmic description and a discussion, we state a complexity evaluation as well as some listening test results.
Year
DOI
Venue
2007
10.1109/TASL.2007.907330
IEEE Transactions on Audio, Speech & Language Processing
Keywords
Field
DocType
audio coding,hz-4 khz,bandwidth extension,hierarchical speech,narrowband core codec,codec design,itu-t rec,additional bit rate,narrowband frequency range,wideband frequency range,respective codec layer,hz-7 khz,algorithmic description,high frequency band,speech coding,high frequency,bandwidth allocation
Wideband,Speech coding,Narrowband,Computer science,Adaptive Multi-Rate audio codec,Bandwidth extension,Speech recognition,Full Rate,G.729.1,Codec
Journal
Volume
Issue
ISSN
15
8
1558-7916
Citations 
PageRank 
References 
10
0.78
12
Authors
8
Name
Order
Citations
PageRank
B. Geiser112215.25
P. Jax2516.75
Peter Vary344447.30
H. Taddei4142.32
S. Schandl5506.01
M. Gartner6100.78
C. Guillaume7100.78
S. Ragot8182.17