一、前言所谓数字电视(DTV)并不是电视机数字化,而是电视信号的过程数字化。你只须在电视机上加装Con-sumerIRD(又称Set Top Box:SIB)就可以接收高品质的数字电视。二、数字电视的优点可与MPEG—2压缩技术结合,将数字化的视频信号加以压缩,再配合数字传输技术(如 QPSK、QAM、VSB或OFDM等数字凋频技术),在有效通道频宽内传送更多的资料。对卫星频宽为36MHz的转发器而言,以前只能传送2～3个FM调频的卫星电视节目, I. Preface The so-called digital television (DTV) is not digital television, but the process of digital television signals. You only need to add Con-sumerIRD (also known as Set Top Box: SIB) on the TV to receive high-quality digital TV. Second, the advantages of digital TV with MPEG-2 compression technology, the digital video signal is compressed, together with the digital transmission technology (such as QPSK, QAM, VSB or OFDM and other digital video frequency technology), within the effective channel bandwidth Send more information. In the case of transponders with a satellite bandwidth of 36 MHz, previously only 2 or 3 FM-tuned satellite programs could be transmitted,