July 17th news, old-fashioned TV is the memory of the post-80s and post-90s generation, because every time there is no signal, you have to run over to turn the antenna, otherwise the TV is a snowflake, and everyone was receiving terrestrial analog TV at that time. Can’t get away from the antenna.
Recently, the State Administration of Radio, Film and Television issued the “Notice on the Work Arrangements for Shutting Down Terrestrial Analog TV as Planned”. According to the “Development Plan for Terrestrial Digital TV Broadcasting Coverage Network” issued in 2012, it was decided to start the shutdown of the central government on June 15, 2020. , Province, city, county terrestrial analog TV signal work.
Completion time The provincial radio and television administrative departments will formulate specific implementation plans based on local actual conditions. Those that have achieved digital broadcasting will be shut down before December 31, 2020. Others that have not achieved digital broadcasting should be accelerated to complete digitalization, and will be completed in 2021. The shutdown will be completed by March 31, 2018.
The whole process of image signal generation, transmission, processing and receiver restoration is almost completed under the analog system. It is characterized by the use of time axis sampling, each frame is sampled in the vertical direction, and the TV image signal is transmitted by amplitude modulation. In order to reduce the frequency band and avoid the sensitive frequency of image reproduction by the human eye, one frame of image is divided into odd and even field scans. In addition, in the 1960s and 1970s, when the main technical parameters of analog TV were determined, the related theories and technical defects made traditional analog TV susceptible to interference, chromaticity distortion, bright color crosstalk, line crosstalk, line creep, etc. Disadvantages such as large area flicker, low definition and weak presence.
Nowadays, analog TV is no longer the mainstream of domestic TV watching. According to statistics, as of the end of June 2019, the total length of the national cable broadcasting and TV transmission trunk network was 2.2527 million kilometers, and there were 216 million cable TV users, including 203 million digital TV users, with a digitization rate of 93.98%, and 100 million high-definition users. There are more than 16 million HD users.
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