What is digital TV?
Digital TV (DTV: Digital Television) refers to a television system that uses digital technology to process, compress, and encode signals such as moving images and sounds, and stores or broadcasts in real time for users to receive and broadcast. All aspects of the system, from studio programming, to processing, transmission, storage / transmission,
Digital signals are used until the receiving and displaying processes. Compared with traditional analog TV, digital TV has significant improvements in both image and sound quality. According to the definition, it can be divided into: standard definition digital television (SDTV: Standard DefiniTIon Television) and high definition digital television (HDTV: High
DefiniTIon Television), the bit rates are about 4 megabits and 20 megabits respectively.
In recent years, the common digital TVs on the market, although some digital signal processing technologies such as sharpness, noise reduction, and anti-flicker are used in the individual links of the original analog TV, are used to improve and improve the image and color of analog color TV Sound quality, but the signal received from the antenna is not a real digital TV,
It is not directly compatible with all-digital TV signals. On the contrary, a true digital TV can receive all digital TV signals and give full play to the advantages of digital TV.
What are the advantages and characteristics of digital TV?
(1) High definition and good audio effect. Because digital signals are used throughout the digital television process, they are not affected by program editing, transmission, rebroadcasting and reception. SDTV digital TV programs can reach DVD quality, and the definition is 4 times higher than current TV when watching HDTV programs, as clear as 35mm movies.
(2) High frequency band utilization. The original PAL channel can play 4 to 8 sets of SD digital TV.
(3) Good anti-interference performance. Solved the problems of flicker, ghosting, and bright color cross-talk in analog TV;
It can achieve high-quality reception of urban buildings, and mobile carriers can also receive clear digital TV programs.
(4) Facilitate the development of various integrated services and interactive services (including Internet services), which is conducive to the construction of "three networks in one" information infrastructure.
(5) Applications such as program encryption processing.
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