摘要
有线数字电视系统中,采用模拟视频和音频信号的方法,对标准进行抽样和量化以及编码压缩,形成了分割成段的编码的ES码流,再配备上打包的基本码流PES,采用相应的头文件的方法,将基本的PES在传输的过程中包装分段,形成基本的固定长度的188拜特的传送包,得到了系统的加密信息形式,存在于多路节目流中,以TS流等传送包码流的方式进行分段,最终经过QAM的射频中的变频信号的调制,在HFC网中,使得用户获得了模拟音频和视频信号。笔者围绕有线数字电视维护中的关键技术指标展开论述。
The digital cable television system,using the method of analog video and audio signal,the standard sampling and quantization encoding and compression,forming a segmented into segments encoding the ES stream,PES stream with packing,using the corresponding header files,the basic PES in the process of transmission the packing section,send a fixed length basic 188 in package,get the encrypted information system,existing multi program stream,to transmit packets of TS flow and flow way is segmented into,after the final QAM RF signal frequency modulation in the in HFC net,enable the user to obtain the analog audio and video signals.The author focuses on the key technical indicators of cable digital television maintenance.
作者
谢茜
Xie Qian(Guangxi Wuzhou Branch of Guangxi Radio and Television Information Network Co.,Ltd.,Wuzhou Guangxi 543000,China)
出处
《信息与电脑》
2017年第8期196-197,共2页
Information & Computer
