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1 前言 数字广播技术,从80年代后期先后在卫星数字电视、地面数字电视和CATV媒体中有了很大的发展。其中卫星数字电视与地面数字电视,不仅在高画质和多频道广播方面具有突出的优异性,而且作为CATV系统的优质节目源也在发挥着巨大的作用。最近,数字广播中双向互动广播的发展,例如地面数字
1 Introduction Digital broadcasting technology has made great strides in satellite digital television, terrestrial digital television and CATV media since the late 1980s. Among them, satellite digital television and terrestrial digital television are not only outstanding in high-definition and multi-channel broadcasting, but also play a great role as high-quality source of CATV system. Recently, the development of two-way interactive broadcasting in digital broadcasting, such as terrestrial digital