China Digital Terrestrial Television
Development and implementation of transmission standards
1, China's five terrestrial digital TV transmission standards will make a difference.
In terms of the adoption of digital TV standards, what standards China adopts does not need foreign recognition. Among the five domestic standard proposals, 20112.22, ITU approved the DMB-T/TDS-OFDM transmission standard as an international standard. Of course, the advantages of other standard proposals will also be integrated into the national standard. In addition, several other standard proposals may be sold to third world countries and contribute to the export of digital TV technology in China. This result is the best for unsuccessful standard proposals (the country may adopt this method).
2. China terrestrial digital TV development memorabilia.
1On September 8th, 998, CCTV conducted an experiment of transmitting and receiving ATSC standard 8-VSB terrestrial broadcast with domestic HDTV receiver.
199965438+1On October 7th, Shenzhen Konka Group Company exhibited the first ATSC standard digital HDTV receiver in China at the CFS Exhibition in America.
1 9991June1day, CCTV began to pilot terrestrial digital HDTV broadcasting.
In August 2000, the State Planning Commission issued a document, agreeing to carry out digital TV research and development and industrialization pilot projects in Beijing, Shanghai and Shenzhen.
On June 65438+1 October1day, 2000, Shanghai TV Station began to pilot terrestrial digital HDTV broadcasting.
200 1, Communication University cooperated with Beijing Cable TV Station to carry out the "direct transmission" experiment of 8MHz/8-VSB digital HDTV RF signal in HFC network from Beijing to Tongzhou District, using channels 30 and 45 respectively. The receiver is 99HDTV produced by Beijing Peony Electronics Group.
In 2002, the state built a TV tower in Wutongshan, Shenzhen, and carried out the experiment and development of terrestrial digital TV broadcasting transmission and reception.
In 2003, mobile TV was piloted in Shanghai for the first time, and then in Beijing, Chengdu, Nanjing, Shenyang, Wuhan and Nanchang.
In July 2004, the first "China Mobile TV Seminar" was held in Shanghai. Nearly 20 provincial TV stations and experts and scholars attended the meeting.
On July 28th, 2004, "Shanghai Digital TV Industry Alliance" was established.
On August 12, 2004, "China Digital TV Industry Summit Forum" was held in Beijing.
On August 6, 2006, the standard of terrestrial digital TV was promulgated.
In 2007, the State Administration of Radio, Film and Television successively applied for and began to compile the supporting standard of 17 to coordinate with the popularization of terrestrial digital TV.
At the beginning of 2008, CCTV terrestrial free HD programs were launched, and the terrestrial digital TV market has been fully launched.
At the beginning of 2008, the high-definition broadcast of CCTV kicked off the comprehensive promotion of terrestrial digital TV broadcasting. Before the Olympic Games, six Olympic cities including Beijing, Shanghai, Tianjin, Shenyang, Qinhuangdao and Qingdao, plus Guangzhou and Shenzhen, opened terrestrial digital TV services.
In March 2008, at ccbn 2008(2008 China International Radio and Television Information Network Exhibition), Tsinghua Lingxun and Shanghai HD launched the first domestic terrestrial digital TV fusion chip. It has brought epoch-making development opportunities for China's high-definition digital TV and terrestrial digital TV industries. Its more important significance lies in promoting the development of mobile high-definition industry, which indicates that the post-digital TV market characterized by mobile is quietly emerging.
The 2008 Beijing Olympic Games promoted the development of terrestrial digital TV industry to a great extent, and this year was also designated as the first year of terrestrial digital TV in China.
In 2009, more than 200 cities in China opened terrestrial digital TV signals for free.
20 1 1 On July 4th, 2008, the "National Standards Publicity Meeting for Terrestrial Digital TV Receiver Series" was held in Beijing Xiyuan Hotel.
From 20 1 1, 1, 1, 1, China's transmission standard GB 20600-2006 "Frame Structure, Channel Coding and Modulation of Digital TV Terrestrial Broadcasting Transmission System" was officially implemented.
201165438+February 22nd, ITU approved DTMB as an international standard. In 2008, the coverage of DTMB signals was completed in 360 cities above prefecture level.
In 20 12, according to the plan of the State Administration of Radio, Film and Television, 2077 counties in China will complete the coverage of DTMB signals, and at the same time, all mobile TVs on buses in China will be converted into DTMB systems. Previously, Hongkong, China and Macau, China have decided to use the DTMB standard, and Cambodia, Laos and Myanmar have also chosen the DTMB standard.
conclusion
1. There is no certain model for developing digital TV, but it is very important to suit China's national conditions.
With the development of television, its application has already surpassed the broadcasting and entertainment industry, and has been widely extended to various fields such as culture and education, scientific research management, industrial and mining enterprises, medical and health care, public security and transportation, military and aerospace, and people's daily life.
China has the largest number of televisions in the world. In the process of developing digital TV, we should actively seek the development path of digital TV that is suitable for China's reality and keeps pace with the times, instead of blindly copying the experience, models and standards of Europe and America, and create a new world of digital TV in China.
The determination of the transmission standard of terrestrial digital TV in China not only coordinates the interests of all parties, but also jumps out of the interests of all parties, * * * strives for the modernization of radio and television, and accelerates the development of digital TV abroad. Modernization is the economic card that determines the transmission standard of terrestrial digital TV in China.
2. The transmission standard of terrestrial digital TV with independent intellectual property rights is related to the core competitiveness of China's TV industry.
The experience of South Korea and Brazil tells us that if foreign technical standards are adopted, the patent fee for each TV set alone will be 20 to 40 dollars. Starting from 1999, the government of China listed the industrialization of digital TV as one of the major national projects during the Tenth Five-Year Plan and the Eleventh Five-Year Plan, and set up a leading group for this purpose. After more than ten years' efforts, domestic scientific research institutions have developed and submitted prototypes of five different system standards. On the basis of laboratory and field tests, the scheme is continuously improved and the performance of the prototype is continuously improved. Finally, the multi-carrier Tsinghua University DMBT standard has been submitted as an international standard proposal.
Since Tsinghua University proposed the DMBT standard in July 1999, the technical system has been improved day by day through theoretical demonstration, computer simulation, laboratory test and field test. Especially in June, 2003, the special chip for receiving channel with independent intellectual property rights was successfully developed, paving the way for industrialization.