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数字电视是将传统的模拟电视信号经过抽样、量化和编码转换成二进制数代表的数字式信号,然后进行各种功能的处理、传输、存贮和记录,可以用计算机进行处理、监测和控制。使用数字技术不仅使各种电视设备获得比原有模拟式设备更高的技术性能,而且还具有模拟技术所不能达到的新功能,使电视技术进入崭新的时代。按信号传输方式数字电视可以分为地面数字电视(地面无线传输)、卫星数字电视(卫星传输)、有线数字电视(有线传输).我国最早使用的数字电视系统是中央电视台的卫星加密频道。考虑到我国电视广播的主要传输方式是有线电
Digital television is the traditional analog TV signal through the sampling, quantization and coding into binary digital representation of the signal, and then carry out a variety of functions, transmission, storage and recording, you can use computer processing, monitoring and control. The use of digital technology not only allows a variety of television equipment than the original analog device higher technical performance, but also with simulation technology can not achieve new features, so that TV technology into a new era. According to the way of signal transmission, digital television can be divided into terrestrial digital television (terrestrial wireless transmission), satellite digital television (satellite transmission) and digital cable television (wired transmission). The earliest digital TV system used in China is CCTV satellite encryption channel. Taking into account China’s main channel of television broadcasting is cable