数字电视前端应急备份改造的应用研究

发布时间：2018-08-01 10:46

【摘要】：本文首先介绍了数字电视前端目前的发展现状,指出了天塔数字电视前端的问题及其改造的必要性和重要性。其后对天塔前端的总体架构、路由和各环节的设备、功能进行了论述,包括信源、信号处理、混合分配三大环节。重点论述了信号处理环节的复用器、矩阵和CA系统,以及相关理论知识和实际功能,如复用器在网管中的配置。在此基础上,论文以解决现有系统存在的问题为目的,对增强系统扩展性和复用器备份应急两方面进行了针对性的分析,并提出解决办法。在现有系统的基础上,以最小的代价,设计系统改造方案。包括临时应急系统的搭建,改造的思路与具体施工操作,复用器的升级方法和配置参数。之后,对网管控制、设备切换、系统参数调整、终端码流等进行测试,全面记录测试目的、方法、数据和结论。在测试中,发现了设备切换速度慢和参数调整时加扰异常两个重要隐患。分析问题,查找其中的原因,提出进一步的解决办法。再次改造系统的信号传输线路,并总结、规划现有分配器和复用器的端口使用状况。测试改造后的复用器、调制器切换速度,确保解决原有问题,并对测试进行分析、总结。此次改造既增强了系统的应急备份和扩展性,又没有破坏原系统的基础结构。在保证安全播出的前提下,提升了系统的综合性能。以最小的代价,延长了系统的生命周期。最后,本文对数字电视未来发展的前景和前端系统的技术趋势做出了展望。
[Abstract]:This paper first introduces the current development of digital TV front end, and points out the problem of Tianta digital TV front end and the necessity and importance of its transformation. Then, the general architecture, routing and equipment functions of the front end of the tower are discussed, including information source, signal processing and mixed allocation. In this paper, the multiplexer, matrix and CA system of signal processing are discussed, as well as related theoretical knowledge and practical functions, such as the configuration of multiplexer in network management. On this basis, aiming at solving the problems existing in the existing system, the paper analyzes the two aspects of enhancing system expansibility and multiplexer backup emergency, and puts forward some solutions. On the basis of the existing system, with the minimum cost, design the system transformation scheme. It includes the construction of temporary emergency system, the train of thought and concrete construction operation, the upgrade method and configuration parameters of multiplexer. After that, the network management control, equipment switching, system parameter adjustment, terminal code stream and so on are tested, and the purpose, method, data and conclusion of the test are recorded. In the test, two important hidden dangers, slow switching speed of equipment and abnormal scrambling when parameters are adjusted, are found. Analyze the problem, find out the causes, and propose further solutions. The signal transmission line of the system is redesigned, and the port usage of the existing distributor and multiplexer is summarized and planned. The switching speed of the multiplexer and modulator after the test is improved to ensure that the original problem is solved, and the test is analyzed and summarized. The reconstruction not only enhances the emergency backup and expansibility of the system, but also does not destroy the original system infrastructure. Under the premise of ensuring safe broadcasting, the comprehensive performance of the system is improved. The life cycle of the system is extended at the lowest cost. Finally, the prospect of the future development of digital TV and the technical trend of front-end system are prospected.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN949.197

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