NDLI: A New Model-Based Algorithm for Optimizing the MPEG-AAC in MS-Stereo

Content Provider	IEEE Xplore Digital Library
Author	Derrien, O. Richard, G.
Copyright Year	2006
Abstract	In this paper, a new model-based algorithm for optimizing the MPEG-advanced audio coder (AAC) in MS-stereo mode is presented. This algorithm is an extension to stereo signals of prior work on a statistical model of quantization noise. Traditionally, MS-stereo coding approaches replace the left (l) and right (R) channels by the middle (M) and sides (S) channels, each channel being independently processed, almost like a monophonic signal. In contrast, our method proposes a global approach for coding both channels in the same process. A model for the quantization error allows us to tune the quantizers on channels M and S with respect to a distortion constraint on the reconstructed channels L and R as they will appear in the decoder. This approach leads to a more efficient perceptual noise-shaping and avoids using complex psychoacoustic models built on the M and S channels. Furthermore, it provides a straightforward scheme to choose between LR and MS modes in each subband for each frame. Subjective listening tests prove that the coding efficiency at a medium bitrate (96 kbits/s for both channels) is significantly better with our algorithm than with the standard algorithm, without increase of complexity.
Sponsorship	IEEE Signal Processing Society
Starting Page	1373
Ending Page	1382
Page Count	10
File Size	883747
File Format	PDF
ISSN	15587916
Volume Number	16
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Psychoacoustic models Quantization Bit rate Signal processing Decoding Audio coding Codecs Layout Decorrelation Noise shaping quantization Bitrate constraint distortion constraint MPEG-Advanced Audio Coder (AAC) MS-stereo optimization algorithm perceptual audio coding scalefactor statistical model
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Electrical and Electronic Engineering

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