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.

Authors: Schuh, Florian; Dick, Sascha; Füg, Richard; Helmrich, Christian R.; Rettelbach, Nikolaus; Schwegler, Tobias
Affiliations: Fraunhofer Institute for Integrated Circuits IIS, Erlangen, Germany; International Audio Laboratories, Erlangen, Germany(See document for exact affiliation information.)
AES Convention: 141 (September 2016) Paper Number: 9660
Publication Date: September 20, 2016
Subject: Signal Processing

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