| The television developed through B/W-TV to color-TV, analog TV to digital TV, standard-definition to high-definiton, and fully entertained the people's life. With the society's continuous progression, informations become more and more important. The digital video broadcast is not only bringing the voice of our government to people, make home entertainments. By using the data broadcast, it also acted as the most important roles to spread information everywhere in modern society. With digital video broadcast headend system and terminal set-top-box or integrated digital TV set's internal software receiver system(middle ware), the digital TV system can bring people the government's information, weather forecast, stock information, NEWS, education, games, online shopping, online payment etc. People can spend less and get more service. As the key component of the data broadcast system, the object carousel generator (OCG) brings information and executable programs to terminal's middle-ware system, display or run it on the TV's screen.This paper mainly focused on the researches of the digital video broadcst and data broadcast standards. First introduce the DTV's structure include the broadcast system and receiver system. Next describe the MPEG2 transmit protocaol, DSM-CC standards and DVB data broadcast standards. In DVB system there are 5 protocaols: Data Piping, Data Stream, Multiprotocol Encapsulation, Data Carousel and Object Carousel. The Object Carousel is the most important protocol and described in a separated chapter. Successively present an OCG principle researched by our team and the test result. This OCG product was widely in commercial using already with the Middle-ware system. |
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