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Title: Analysis by synthesis spatial audio coding
Authors: Elfitri, Ikhwana
Shi, Xiyu
Kondoz, Ahmet
Issue Date: 2014
Publisher: © The Institution of Engineering and Technology
Citation: ELFITRI, I., SHI, X. and KONDOZ, A., 2014. Analysis by synthesis spatial audio coding. IET Signal Processing, 8 (1), pp.30-38.
Abstract: This study presents a novel spatial audio coding (SAC) technique, called analysis by synthesis SAC (AbS-SAC), with a capability of minimising signal distortion introduced during the encoding processes. The reverse one-to-two (R-OTT), a module applied in the MPEG Surround to down-mix two channels as a single channel, is first configured as a closed-loop system. This closed-loop module offers a capability to reduce the quantisation errors of the spatial parameters, leading to an improved quality of the synthesised audio signals. Moreover, a sub-optimal AbS optimisation, based on the closed-loop R-OTT module, is proposed. This algorithm addresses a problem of practicality in implementing an optimal AbS optimisation while it is still capable of improving further the quality of the reconstructed audio signals. In terms of algorithm complexity, the proposed sub-optimal algorithm provides scalability. The results of objective and subjective tests are presented. It is shown that significant improvement of the objective performance, when compared to the conventional open-loop approach, is achieved. On the other hand, subjective test show that the proposed technique achieves higher subjective difference grade scores than the tested advanced audio coding multichannel.
Description: This paper is a postprint of a paper submitted to and accepted for publication in IET Signal Processing and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library.
Sponsor: This work was supported by the ROMEO project (grant number: 287896), which was funded by the EC FP7 ICT collaborative research programme.
Version: Accepted for publication
DOI: 10.1049/iet-spr.2013.0015
URI: https://dspace.lboro.ac.uk/2134/35295
Publisher Link: https://doi.org/10.1049/iet-spr.2013.0015
ISSN: 1751-9675
Appears in Collections:Published Articles (Loughborough University London)

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