Estimating spatial cues for audio coding in MDCT domain

Authors:
Shuixian Chen;Ruimin Hu;Shuhua Zhang
Affiliations:
Computer School, Wuhan University, Wuhan, China;Computer School and National Engineering Research Center for Multimedia Software, Wuhan University, Wuhan, China;Department of Electronic Engineering, Tsinghua University, Beijing, China
Venue:
ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
Year:
2009

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Abstract

Although widely used otherwise, MDCT is excluded in the current scheme for spatial cues representation, due to its lacking of phase information and energy conservation. But combining MDCT with MDST overcomes the difficulties. Moreover, MDST spectra can be built perfectly from neighboring MDCT spectra. The MDCT-MDST conversion, in matrix form, is approximating to a banded sparse matrix. When applied to spatial audio coding using MDCT based core coders, this method avoids separate transforming for cues representation and saves significant computation. Listening tests also show that it has same audio quality as other complex transform based methods.