Practical design of delta-sigma multiple description audio coding

作     者：Leegaard, Jack Ostergaard, Jan Jensen, Soren Holdt Zamir, Ram 

作者机构：Aalborg Univ Dept Elect Syst DK-9220 Aalborg Denmark Tel Aviv Univ Dept Elect Engn Syst IL-69978 Tel Aviv Israel 

出 版 物：《EURASIP JOURNAL ON AUDIO SPEECH AND MUSIC PROCESSING》 (Eurasip J. Audio Speech Music Process.)

年 卷 期：2014年第2014卷第1期

页      面：1页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0702[理学-物理学] 

主　　题：Audio coding Multiple descriptions Noise shaping Predictive coding 

摘      要：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.