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Efficient multichannel audio transform coding with low delay and complexity

: Schuh, Florian; Dick, Sascha; Füg, Richard; Helmrich, Christian; Rettelbach, Nikolaus; Schwegler, Tobias

Audio Engineering Society -AES-:
141st Audio Engineering Society Convention 2016 : Los Angeles, California, USA, 29 October-1 November 2016
Red Hook, NY: Curran, 2016
ISBN: 978-1-5108-3309-8
Audio Engineering Society (AES International Convention) <141, 2016, Paris>
Fraunhofer IIS ()
MPEG-H 3D Audio; Hörtests

For multichannel input such as 5.1-surround material, contemporary transform-based perceptual audio codecs provide good coding quality even at very low bit rates. These codecs rely on discrete joint-channel coding and parametric spatial coding schemes. The latter require dedicated complex-valued filter-banks around the core-codec, which increase both the algorithmic complexity and latency. This paper demonstrates that the discrete joint-channel as well as known semi-parametric spatial coding principles can also be realized directly within the real-valued modified discrete cosine transform (MDCT) domain of the core-coder, thereby eliminating the need for auxiliary filter-banks. The resulting fully flexible signal-Adaptive coding scheme, when integrated into the MPEG-H 3D Audio codec, offers the same quality as the state of the art even at bit rates as low as 80 kbit/s for 5.1 surround.