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Stereo Audio Coding Improved by Phase Parameters

The parametric stereo coding exploiting phase parameters in a bit-efficient way is a part of MPEG-D USAC (Unified Speech and Audio Coding) standard. This paper describes the down-mixing and up-mixing scheme to further enhance the stereo coding in strong out-of-phase or near out-of-phase signals. The conventional down-mixing as a sum of left and right channel for parametric stereo coding has the potential problems, phase cancellation in out-of-phase signals which results in audible artifacts. This paper proposes the phase alignment by estimated overall phase difference (OPD) parameter and inter-channel phase difference (IPD) parameter. Furthermore, this paper describes the phase modification to minimize the phase discontinuity of down-mixed signal by scaling the size of the stereo channels.

Authors: Kim, Miyoung; Oh, Eunmi; Shim, Hwan
Affiliation: Samsung Electronics, Gyeonggi-do, Korea
AES Convention:129 (November 2010) Paper Number:8289 Import into BibTeX
Subject:Low-Bit-Rate Audio Coding

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