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http://dx.doi.org/10.5573/ieie.2014.51.6.221

An Improved Synthesis Method of Parametric Stereo Coding Based on Tonality Information  

Lee, Tung chin (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.51, no.6, 2014 , pp. 221-227 More about this Journal
Abstract
In this paper, we propose a synthesis method that can effectively suppress the ambience which affects tonal components in the PS decoder. Ambience component was obtained by using decorrelation filter and the weighting of the ambience in the decoder was determined through IC parameter. However, since the parameters are extracted in the sub-band domain, a low IC value could be analyzed even if the tonal component is dominant. The quality of the output signal may be degraded. To prevent this problem, the tonality was measured in the downmixed signal and the weighting of the ambience components were adjusted appropriately according to the measured tonality index. The performance of the proposed method was evaluated by simulations. Furthermore, the subjective test was performed and the results confirmed that the proposed method offers improved quality.
Keywords
Parametric stereo; MPEG surround; tonality; spatial audio coding;
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