There are two technique problems for Terrestrial digital TV transmitter: one is the channel coding modulation technique whch is dependent of TV system;
数字地面电视发射机有两大技术难点：一是与制式有关的信道编码调制技术；
With the coming of digital times, there exists emerging need to upgrade the ground transmission standards which brings both challenges and opportunities to the TV transmitter manufacturers.
指出电视数字化时代的到来、地面传输标准的升级，给我国电视发射机制造企业提出了新的挑战，同时也给企业提供了新的机遇。
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