New Context-Adaptive Arithmetic Coding Scheme for Lossless Bit Rate Reduction of Parametric Stereo in Enhanced aacPlus

Hee-Suk PANG  Jun-seok LIM  Hyun-Young JIN  

IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.12   pp.3258-3262
Publication Date: 2018/12/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2018EDL8135
Type of Manuscript: LETTER
Category: Speech and Hearing
context-adaptive arithmetic coding,  lossless bit rate reduction,  parametric stereo,  coding efficiency,  

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We propose a new context-adaptive arithmetic coding (CAAC) scheme for lossless bit rate reduction of parametric stereo (PS) in enhanced aacPlus. Based on the probability analysis of stereo parameters indexes in PS, we propose a stereo band-dependent CAAC scheme for PS. We also propose a new coding structure of the scheme which is simple but effective. The proposed scheme has normal and memory-reduced versions, which are superior to the original and conventional schemes and guarantees significant bit rate reduction of PS. The proposed scheme can be an alternative to the original PS coding scheme at low bit rate, where coding efficiency is very important.