Practical Design of Delta-Sigma Multiple Description Audio Coding

Jack Højholt Leegaard, Jan Østergaard, Søren Holdt Jensen, Ram Zamir

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

It was recently shown that delta-sigma quantization (DSQ) can be used for optimal multiple description (MD) coding of Gaussian sources. The DSQ scheme combined oversampling, prediction, and noise-shaping in order to trade off side distortion for central distortion in MD coding. It was shown that asymptotically in the dimensions of the resampling, prediction, and noise-shaping filters as well as asymptotically in the quantizer dimensions, all rate-distortion points on the symmetric quadratic Gaussian MD rate-distortion function could be achieved. In this work, we show that this somewhat theoretical framework is suitable for practical low-delay MD audio coding. In particular, we design a practical MD audio coder with two descriptions and provide simulations on real audio data. The simulations demonstrate that even when using low-dimensional noise-shaping, prediction, and resampling filters, it is possible to obtain good quality audio in the presence of packet losses. Simulations on real audio reveal that, contrary to existing designs, it is straightforward to obtain a large number of trade-off points between side distortion and central distortion, which makes the proposed coder suitable for a wide range of applications.
Original languageEnglish
JournalEurasip Journal on Audio, Speech, and Music Processing
Volume2014
Issue number16
ISSN1687-4714
DOIs
Publication statusPublished - 2014

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