There are two technique problems for Terrestrial digital TVtransmitter: 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；
2
For high requirement of transmitting carrier in TVtransmitter, frequency synthesizer as one of the most important parts in transmitting system is researched in this paper.
就电视发射机对发射载波的高要求，论文对电视发射系统中关键部件之一的频率合成器进行了研究。
3
In the fourth chapter, it illuminates the theory of TV carrier frequency precision control in TVtransmitter, the design scheme and system configuration are also introduced.