Efficient transform coding of two-channel audio signals by means of complex-valued stereo prediction
Traditional MDCT-based perceptual audio coding schemes employ mid/side and intensity stereo techniques to allow efficient joint coding of the two channels of a stereophonic signal. These techniques, however, provide only little coding gain for critical stereo signals characterized by spectral compon...
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creator | Helmrich, Christian R. Carlsson, Pontus Disch, Sascha Edler, Bernd Hilpert, Johannes Neusinger, Matthias Purnhagen, Heiko Rettelbach, Nikolaus Robilliard, Julien Villemoes, Lars |
description | Traditional MDCT-based perceptual audio coding schemes employ mid/side and intensity stereo techniques to allow efficient joint coding of the two channels of a stereophonic signal. These techniques, however, provide only little coding gain for critical stereo signals characterized by spectral components with a distinct level or phase difference between the channels. To overcome this deficiency, we propose an extension to the mid/side coding paradigm that utilizes complex-valued inter-channel linear prediction in the MDCT spectral domain. The required imaginary spectrum (MDST) is calculated in a computationally efficient manner without additional algorithmic delay. A formal listening test conducted in the course of the ISO/MPEG standardization of the unified speech and audio codec USAC illustrates that the proposed stereo prediction approach pro vides significant improvements in coding efficiency and shows that at 96 kb/s, excellent quality can be obtained even for critical signals. |
doi_str_mv | 10.1109/ICASSP.2011.5946449 |
format | Conference Proceeding |
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These techniques, however, provide only little coding gain for critical stereo signals characterized by spectral components with a distinct level or phase difference between the channels. To overcome this deficiency, we propose an extension to the mid/side coding paradigm that utilizes complex-valued inter-channel linear prediction in the MDCT spectral domain. The required imaginary spectrum (MDST) is calculated in a computationally efficient manner without additional algorithmic delay. A formal listening test conducted in the course of the ISO/MPEG standardization of the unified speech and audio codec USAC illustrates that the proposed stereo prediction approach pro vides significant improvements in coding efficiency and shows that at 96 kb/s, excellent quality can be obtained even for critical signals.</abstract><pub>IEEE</pub><doi>10.1109/ICASSP.2011.5946449</doi><tpages>4</tpages></addata></record> |
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source | IEEE Electronic Library (IEL) Conference Proceedings |
subjects | Audio coding Compaction Complexity theory Decoding M/S stereo MDCT prediction Transform coding Transforms |
title | Efficient transform coding of two-channel audio signals by means of complex-valued stereo prediction |
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