Cable is through the set up visible network, and through these wires the television transmission mode of TV programs, the most common route is the ordinary people home into a white cable, this is a single coaxial cable and interface as the prototype, there is a core barrel.Close to 90% of the urban residents in our country is in this way to receive the TV signal, ordinary users need to cable television reporting and open services, will be able to watch the corresponding channel.
Traditional cable television is the transmission of the analog signal, and our country is now in the universal access to transform can be digital signal transmission cable.Digital cable TV is the most simple implementation in many types of digital television transmission way is one of the most low cost way, using the old cable transmission network for transmission, only need to configure a receiving box at the receiving end can watch, saves the user the trouble of putting up the aerial on its own.
Since the digital signal after transmission in terminal for signal regeneration, so as to ensure the cable digital TV front end, the received signal quality and launch avoid twill, the phenomenon such as snowflakes, standard definition digital signal can reach DVD with clear image quality.
Digital cable television transmitting not only television program, also provides powerful information service, it USES the two-way information transmission technology, strengthen the function of interaction, make TV a kind of economical and practical, fast and convenient interactive medium.The user can according to their own need to open the video on demand, online shopping, remote education, remote medical treatment, data transfer, by radio, and many other business.
With the upgrading of optical transmitter, optical fiber amplifier and optical receiver, digital TV is becoming more and more popular.
In this paper, published by shandong Wan Shuo radio and television equipment co., LTD.