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The research on streaming media coding and transmission technology which is realtime and robust, has become a hotspot in current information technology. As a method of solving this problem, multiple description coding (MDC) is concerned widely, due to satisfy the requirement of real-time data transmission and reduce data distortion. This paper firstly introduces the history of MDC and its factors for evaluating performance. Then, it elaborates the research and progress of MDC, including the ideas, frames and characteristics of various kinds of MDC methods. Finally, it discusses the difficult problems on this area.
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