On Terrestrial Digital TV Standards (Domestic Chapter) Part 2

On December 22, 2011, my country’s DMB-T/TDS-OFDM (Terrestrial Digital Multimedia and Television Broadcasting System/Time Domain Synchronous Orthogonal Frequency Division Multiplexing) standard was named by the ITU (International Telecommunications Union) As an international standard, this will clear away the confusion and haze that analog TV standards have brought to our country for decades, and greatly promote the development of the global TV industry, division of labor, and trade. Countries around the world attach great importance to the formulation of their terrestrial digital television transmission standards and related independent intellectual property rights issues. This article analyzes and discusses the current four global terrestrial digital television standards and their related development processes and technical characteristics (divided into two parts, international and domestic), in order to increase the attention of industry insiders.

my country's terrestrial digital TV

Research and development and implementation of transmission standards

1. my country's five terrestrial digital TV transmission standards will all make a difference

In terms of the adoption of digital TV standards, since the standards adopted by our country do not require foreign recognition, among the five domestic standard proposals, on December 22, 2011, the 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 national standards, and several other standard proposals are likely to be sold to third world countries and contribute to the output of my country's digital TV technology. This outcome For the failed standards proposal, this is the best option (the country may adopt this approach).

2. Major events in the development of terrestrial digital television in my country

On September 8, 1998, CCTV used a domestic HDTV receiver to conduct ATSC standard 8-VSB terrestrial broadcast transmission and Received experiment.

On January 7, 1999, Shenzhen Konka Group Corporation displayed my country's first ATSC standard digital HDTV receiver at the "American CFS Exhibition".

On October 1, 1999, CCTV began trial broadcasting of terrestrial digital HDTV broadcasts.

In August 2000, the State Planning Commission issued a document agreeing to conduct digital TV research, development and industrialization pilot projects in three cities: Beijing, Shanghai, and Shenzhen.

On October 1, 2000, Shanghai TV Station began trial broadcasting of terrestrial digital HDTV broadcasts.

In 2001, Communication University and Beijing Cable TV cooperated to carry out 8MHz/8-VSB digital HDTV radio frequency signals on channels 30 and 45 in the cable TV HFC network from Beijing to Tongzhou District. For the test of "direct transmission", the receiver is 99HDTV produced by Beijing Mudan Electronics Group.

In 2002, the state built a television transmission tower on Wutong Mountain in Shenzhen to conduct testing and development of the transmission and reception of terrestrial digital television broadcasts.

In 2003, mobile TV was piloted for the first time in Shanghai, followed by trials in Beijing, Chengdu, Nanjing, Shenyang, Wuhan, Nanchang and other places.

In July 2004, the first "China Mobile TV Seminar" was held in Shanghai. Nearly 20 provincial TV stations across the country as well as experts and scholars participated in the meeting.

On July 28, 2004, the "Shanghai Digital TV Industry Alliance" was established.

On August 12, 2004, the "China Digital TV Industry Summit Forum" was held in Beijing.

The terrestrial digital television standard was promulgated on August 16, 2006.

In 2007, the State Administration of Radio, Film and Television applied for and began to compile 17 supporting standards to coordinate the popularization and promotion of terrestrial digital television.

With the launch of CCTV’s free terrestrial high-definition programs at the beginning of 2008, the terrestrial digital TV market has been fully launched.

In early 2008, the launch of CCTV high-definition broadcasting kicked off the comprehensive promotion of terrestrial digital TV broadcasting. Before the Olympics, six Olympic cities including Beijing, Shanghai, Tianjin, Shenyang, Qinhuangdao, and Qingdao, plus Guangzhou and Shenzhen, Launched terrestrial digital television service.

In March 2008, at the CCBN2008 exhibition (2008 China International Radio and Television Information Network Exhibition), Tsinghua Lingxun and Shanghai HD launched China's first terrestrial digital TV integration chip with high profile. It has brought epoch-making development opportunities to my country's high-definition digital TV and terrestrial digital TV industries.

Its more important significance is that it has promoted the development of the mobile high-definition industry, indicating that the post-digital TV market characterized by mobile is quietly emerging.

The 2008 Beijing Olympics greatly promoted the development of the terrestrial digital television industry, and has therefore been designated as the first year of terrestrial digital television in China.

In 2009, terrestrial digital TV signals were launched in more than 200 domestic cities at no charge.

On July 4, 2011, the "Terrestrial Digital TV Receiver Series National Standards Publicity and Implementation Conference" was grandly held at the Xiyuan Hotel in Beijing.

The terrestrial digital TV transmission standard GB 20600-2006 "Digital TV Terrestrial Broadcasting Transmission System Frame Structure, Channel Coding and Modulation" with my country's independent intellectual property rights will be officially implemented on November 1, 2011.

On December 22, 2011, ITU approved DTMB as an international standard. In the year, 360 prefecture-level cities (cities above) across the country completed DTMB signal coverage.

In 2012, according to the plan of the State Administration of Radio, Film and Television, 2,077 counties across the country will complete DTMB signal coverage, and at the same time, all mobile TVs in buses across the country will be converted to the DTMB system. Hong Kong, China and Macau, China have previously 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 the development of digital TV. The important thing is to suit the national conditions of the country.

With the development of television today, its scope of application has long been It has transcended the world of broadcasting and entertainment and has been widely extended to various fields such as culture and education, scientific research and management, industrial and mining enterprises, medical and health care, public security and transportation, military aerospace and people's daily lives.

Our country is the country with the largest number of TVs in the world. In the process of developing digital TV, it actively seeks a digital TV development path that is suitable for our country’s reality and keeps pace with the times, and does not blindly copy the experience of Europe and the United States. Models and standards have created a new world of digital TV in our country.

The determination of my country's terrestrial digital TV transmission standards coordinates the interests of all parties and transcends the interests of all parties to pursue the major event of radio and television modernization and accelerate the development of foreign digital TV. Modernization is the economic card that determines my country's terrestrial digital TV transmission standards.

2. Terrestrial digital TV transmission standards with independent intellectual property rights are related to the core competitiveness of our country’s TV industry

The experience of South Korea and Brazil tells us that if foreign technical standards are adopted, only The patent fee for each TV set is US$20 to US$40. Since 1999, the Chinese government has included digital TV industrialization as one of the major national projects during the "Tenth Five-Year Plan" and "Eleventh Five-Year Plan" periods, and has established a leading group for this purpose. After more than ten years of efforts by scientific researchers across the country, various scientific research institutions in my country have developed prototypes of five different system standard proposals submitted. Based on laboratory and field tests, the plans have been continuously improved, and the performance of the prototype has been continuously improved. The final report A proposal to send the multi-carrier Tsinghua University DMBT standard as an international standard.

Since Tsinghua University’s DMBT standard proposal was put forward in July 1999, it has gone through theoretical demonstration, computer simulation, laboratory testing, field testing and other stages, and the technical system has been increasingly improved. Especially in June 2003, the special chip for receiving channels with independent intellectual property rights was successfully developed, paving the way for industrialization.