2 thoughts on “Is Qingdao DVB-T wireless digital TV signal opened?”

  1. Word TV is a TV system that uses digital TV signals in the links of broadcasting, transmission, receiving, and other links. Digital TV systems can transmit a variety of businesses, such as high -definition TV (HDTV), conventional clarity TV (SDTV), interactive TV, and data services. The TV that can directly receive and process foreign digital television signals can be directly received as digital TVs. A television that receives digital processing technology during the process of receiving analog TV signals and only uses digital processing technology in the process of image restoration is often called "digital TV", but this is not a real digital TV. Since China has not determined digital TV standards by the end of 2004, household TVs in the Chinese market have not yet real digital TVs. In order to enable the existing analog TV in the family to continue to play, you can use the "Set-Top Box" to complete the conversion of digital TV signals to simulation TV signals, so that the original TV can complete the TV receiving function. Essence Digital TV standards usually refer to digital television standards generally refer to the transmission standards, including ATSC in North America, European DVB and Japan's ISDB. China ’s digital ground TV standards have not yet been determined. Taiwan adopts European specifications DVB system. According to the spatial communication of the signal, digital TV systems mainly include three forms: digital TV ground transmission systems, digital cable TV systems, digital satellite TV systems. Digital TV systems include front -end systems, transmission networks and receiving terminals. The development of digital TV China China began digital television tests in 1998. From 2003 to 2004, Beijing, Shanghai, Shandong Qingdao, Jiangsu, Hangzhou, Zhejiang, Foshan, Guangdong, Dalian and other places opened digital TV broadcasts. China ’s digital TV standards have been studied since 1998. It has not yet formed a unified standard for investing more than 1 billion yuan in 6 years. In fact, the industrialization process of the European DVB standard is far behind, causing a large number of manufacturers to prepare for multiple sets of technical solutions, and there is no market environment. China's digital television charging model has not formed: Among China's original TV system, the program watched free of charge, and the TV system obtained income by plugging in advertising. There are dozens of free simulation TV programs broadcast in various places. This is an important problem for the charging mode of establishing a digital TV program; China's radio and television system is a state -owned princes' separation status of local independent operations. Focus on interests. From June 1, 2004, Taiwan and Taiwan began to broadcast the wireless digital television. The participants were five TVB (Taiwan TV Corporation, China TV Corporation, China TV, Civil TV, Public TV). Channel broadcasts in the UHF frequency band. Starting from 2006, it has gradually recovered the old -fashioned TV channels. Japan and Japan have begun to launch a digital TV signal from December 1, 2000 to BS Digital. Starting from December 1, 2003, it will start a digital TV signal in the three major metropolitan areas (Tokyo, Shima, and Nagoya), which will gradually expand to Japan. Since 2004, MOBILE HO digital TVs for mobile ratings. In short, digital TV refers to all links from the studio to the launch, transmission, and receiving. The propagation rate of digital signals is 19.39 mega bytes per second. The transmission of such large data streams ensures the high definition of digital TV and overcomes the congenital lack of simulated TV. At the same time, because digital TVs can allow several types of signals to exist at the same time, each digital channel can be divided into several sub -channels, so that one big data stream can be used -19.39 mega bytes per second, or it can be divided into dividends. For several diversion, such as 4, each speed is 4.85 mega bytes per second. Although the clarity of the image is greatly reduced, it can greatly increase the type of information and meet different needs. For example, when broadcasting a sports competition, the audience needs a high -definition image, and the TV station should use 19.39 trillion bytes per second. When performing news broadcasts, the audience pays attention to the image of the news instead of the broadcaster. Therefore, there is no need to use such a high clarity. At this time, it only takes the speed of 3 mega bytes per second. The remaining 16.39 mega bytes can be used to transmit other content. At present, there are two main interpretations of digital TVs: (1) In the 1980s, ITT companies developed a set of digital processing chips. In the case of receiving analog TV signals, I then simulated high -school frequency processing. Finally, the mold / number was converted to the number Digital signals are processed to improve image clarity. In the 1990s, there were a variety of "digital televisions" with paintings in painting, double -line and other quality, and improved, but these TVs were still receiving simulation TV signals, and they are still in the simulation system of simulation transmission, so they can only be only possible. Known as a "digital simulation TV", it is not a digital TV in the real sense. (2) The United States' "Digital TV" (referred to as DTV) refers to the ground digital TV broadcast system. In this system, in addition to the current production of the program production, all links from the studio to the launch, transmission, and receiving are used to use digital TV signals or processing and modulating digital TV signals. And only the TV that receives the ground digital TV broadcast signal is a veritable digital TV.

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