| It is inevitable that Digital TV will take place of analog TV, and the system of receiving DTV signal based on PC platform is carry-home, flexible etc. These years, the DTV Terrestrial Broadcasting is in great progress in the whole world, and new technologies and products emerging in receiving DTV Terrestrial Broadcasting signal based on PC platform.Digital Broadcasting Receiver based on USB bus is composed of front-end channel demodulation module and back-end stream decoder module. A new hardware and software architecture is designed on the foundation of USB DTV receiver solution supplied by French Dibcom Company, the research and implementation of the key technology of the system has been done.Back-end stream decoder module emphasizes on two parts: the design and implementation of driver, the design and implementation of application software. Middleware Directshow is between the two parts.For the design and implementation of driver, we discuss the AVStream architecture and the construction of BDA minidriver. The key technology emphasizes on the design and implementation of key routines, and the design of the descriptor and the implementation of DMA. Based on the research of driver architecture, the design and implementation of key routines has been done. Finally, discuss the setup of descriptor in detail.The latter emphasizes on two technologies: the construction of filter graph and the development of Filter for relevant function. Two methods of the construction of filter graph were introduced, and the implementation of playback of DTV program has been done. With the research of Filter, the design and implementation of the Filter for the display of Teletext&Subtitle has been done.The system is tested. The results show that the receiver could receive the DTV signal, and DTV program, Teletext&Subtitle, the saved program could be displayed on the terminal PC. |
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