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http://dx.doi.org/10.5573/ieek.2013.50.12.184

Improved Phase Synthesis for Parametric Stereo Audio Coding  

Hyun, Dong-Il (School of Electrical and Electronic Engineering, Yonsei University)
Park, Young-Cheol (Computer and Telecommunications Engineering Division, Yonsei University)
Youn, Dae Hee (School of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.12, 2013 , pp. 184-190 More about this Journal
Abstract
Parametric stereo(PS) audio coding is a specific version of spatial audio coding. In this paper, the problem due to the conventional synthesis of phase differences. In the conventional upmix matrix, phase differences are synthesized not only on downmix signal but also ambient signal, which violates the assumption that the ambient signals are anti-phased. Deterioration due to the phase synthesis is analyzed, especially, for low interchannel correlation. To solve this problem, new upmix matrix is proposed, which synthesizes phase differences only on downmix signal. The performance of the proposed upmix matrix is verified by the subjective listening tests.
Keywords
parametric stereo; phase synthesis; anti-phase;
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