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结合视频点播（ＶＯＤ）系统中的一种存储与传输技术，分析并介绍了一种机顶盒（ＳＴＢ）功能的实现方案，研究了机顶盒视频点播（ＶＯＤ）缓存控制问题并提出了一种控制算法．
Based on a storage and transmission technology in video on demand (VOD) system, an implementation of STB function is analyzed and introduced. The problem of VOD cache control in STB is studied and a control algorithm is proposed.