| TV broadcasting with 5.1 surround sound technology has been common in TV stations of western countries, while it is different situation in domestic television stations. Lacking of necessary attentions to sound production and less investment lead to the short of surround sound production platforms, especially for high production requirements surround large field variety shows. Thus, a precedent of variety show surround sound production is still not available. In this paper, as the program carrier, "The Voice of China" team completed the design of Dolby 5.1 surround sound and television audio broadcast system based on mobile TV broadcasting vehicle, and made the TV broadcasting for the first domestic variety show with 5.1 surround sound technology successfully.In this paper,5.1 surround sound technology and Dolby coding and decoding technology are key technologies. Surround sound technology provides main standard for the design of surround sound production system while Dolby codec technology makes effective control of broadcasting and terminal effects during surround sound production stage. It also simplifies the system link for surround sound broadcasting to adapt to domestic digital TV transmission mode, providing a solution for the multi-channel compatible broadcasting."The Voice of china" is a typical large field shows, this thesis carries on the demand analysis, in a safe, open, flexible, efficient, high quality as the design concept design and implement a 5.1 surround sound audio car TV broadcast system, and the introduction of Dolby coding and decoding technology, through the reform of broadcast link, put forward the broadcast of the multi-channel compatible solution. Firstly, the audio car system architecture, based on link and system technology and Dolby work process are described, the design of the and decoding system, synchronization system, delay system, monitoring and supervision system, the acoustic design.This system according to the demands analysis of equipment selection and integration installation, construction is completed, according to the administration on the technical requirements of the system performance test, Dolby metadata is an important parameter affecting the surround sound broadcasting quality, this paper uses Voice of china as the experimental object, the Dolby metadata makes a deep analysis test, and lists comparison of metadata, and details of the program of surround sound production process, in addition, this paper has also carried on the surround Dolby digital decoding test to the user terminal.Analysis of the trend of surround sound technology and the future of the development of this technology based on video and audio communication are also included in this paper. |
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