论文部分内容阅读
２１世纪地面主要广播形式──有线电视（四）孙宏明四、有线电视系统的组成一个有线电视系统通常分为前端、传输、用户三部分，如图１０、图１１所示。前端的主要作用是接收信号和播出信号。接收的信号包括：开路电视的信号，ＶＨＦ频段或ＵＨＦ频段；ＦＭ广播信号；地面...
The 21st century, the main form of terrestrial broadcasting ─ ─ Cable Television (D) Sun Hongming Fourth, the composition of a cable television system A cable television system is usually divided into front-end, transmission, user three parts, as shown in Figure 10, Figure 11. The front of the main role is to receive signals and broadcast signals. Received signals include: open-circuit television signal, VHF band or UHF band; FM broadcast signal; ground ...