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Journal of Information Science and Engineering, Vol. 30 No. 6, pp. 2019-2032 (November 2014)

Context-Based Arithmetic Coding Scheme for Parametric Stereo in Enhanced aacPlus*

1Department of Electronics Engineering
Sejong University
Seoul, 143-747 Korea
E-mail: {hspang; jslim}
2Department of Electronic Engineering
Kyonggi University
Suwon, 443-760 Korea

Enhanced aacPlus is an audio codec which is composed of advanced audio coding (AAC), spectral band replication (SBR), and parametric stereo (PS) for efficient audio coding at low bit rates. We propose a new coding scheme for lossless bit rate reduction of PS in enhanced aacPlus. We first determine the optimal contexts for context-based coding of quantized stereo parameter indexes in PS. Then we propose a coding scheme which is based on context-based coding using the determined optimal contexts in conjunction with arithmetic coding. The proposed scheme has normal and memory-reduced versions, both of which are shown to guarantee significant and consistent lossless bit rate reduction of PS. The saved bits by the proposed scheme can be used for the other modules of enhanced aacPlus, AAC and SBR.

Keywords: enhanced aacPlus, parametric stereo, lossless bit rate reduction, context-based coding, arithmetic coding

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Received November 16, 2012; revised January 21 & May 20, 2013; accepted July 24, 2013.
Communicated by Hsin-Min Wang.
* This work was supported under the framework of international cooperation program managed by the National Research Foundation of Korea.
+ Corresponding author.