Technology In The Classroom: Digital Tv 100 Q (1) - Digital Television, Technology - Radio And

Digital television technology into China has more than ten years

, subject to the environmental impact of industry, is still a relatively closed technologies, many operators do not spend a huge amount of money after the desired effect. In order to identify the source of the problem, but also combined with our understanding of the market and technology, and the problems we usually encounter, especially the preparation of this quiz. Wrong with it, also requested the experts and operators in the industry criticized the correction. ?? Letter Electronics Co., Ltd. Shandong Thailand

I. Digital TV History 1, DVB digital TV from the start?

DVB is DigitalVedioBroadcasting, (DVB digital video Broadcasting English abbreviation). DVB digital TV standard developed in 1990, after years, was formally established in 1995, DVB Alliance, organized by the European Telecommunications Standards (ETSI), European Broadcasting Union (EBU) and more than 300 companies and other organizations co-sponsored organizations, and has become the international standard So far, nearly 20 years, has developed into a very mature technology. Depending on the transmission channel is divided into DVB-S and the DVB-S2 (satellite), DVB-C (Cable), DVB-T (terrestrial wireless), DVB-H (Hand-held terrestrial wireless) and other transmission standards.

2, the world also which digital TV technical standards and the relationship between each other?

Addition to DVB transmission standard, there is the North American ATSC, Japan's ISDB-T, DMB-TH standard Chinese. Usual sense, these are channels that digital television transmission standard. Almost all the world's digital television system ( Mobile TV Excluded), after the channel multiplexing demultiplexing, conditional access and other DVB standards basically follow the relevant standards or above the standard to do a simple extension.

The main difference is the transmission standard used by different modulation methods, such as satellite digital TV using QPSK modulation, the European Cable television Using the DVB-C, terrestrial digital TV using the multi-carrier COFDM modulation, etc., North America, terrestrial digital TV mode using the single-carrier 8VSB.

3, China's digital television is what did it start?

Early as 1994, China began a digital television broadcasting, satellite transmission through the central TV station Program, basically, and foreign synchronization. At that time, or use of private standards, then gradually transition to the DVB standard.

4, digital television technology is not an open technology?

So far, CA, browser and other software also need to STB Factory integration, bundled software and hardware has led to restrict competition, it is a very closed digital television technology. With the new digital television broadcasting services on demand, digital television technology, hardware and software bundle is gradually closed and became an obstacle to development and progress.

Is precisely because the technology is closed, resulting in a digital television software, backward, backward to protect the CA smart card technology, making the technology in 10 years time, no development; hardware and software bundle is also protected behind set-top box chips, makes extensive use of set-top box chips generally 3 years or even 5 years ago of old products, resulting in radio and television operators Digital Level is not high, and many began to shift the place in huge amounts of money spent after the completion of the analog switch to digital only.

II CAS Digital TV conditional access system, common sense

5, What is digital TV conditional access system?

Digital TV conditional access system (ConditionalAccessSystem) on radio and television is a more important technology, related to encryption, add descrambling technologies. Digital TV conditional access is encrypted to ensure control of the core technology to enable authorized users to watch pay programs, while unauthorized users can not watch the pay program. Because the digital TV conditional access system is a complex and closed technology, so many people feel there is a layer of mystery.

6, mobile phone, "Machine Card Separation" and the digital TV's "UIM" What is the difference?

Digital TV's "Machine Card Separation" is a reference to a large extent, the concept of mobile phone industry, "Machine Card Separation."

by:gaga

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