图文电视解码器的设计

发布时间：2018-07-08 19:49

本文选题：图文电视 + 解码器　；参考：《电子科技大学》2012年硕士论文

【摘要】：Teletext是一种在不增加额外带宽的基础上，在电视频道中传输一些文字和简单图像信息的标准。在此标准下，电视服务提供商可以在电视信号中提供节目导航信息，生活服务信息，即时新闻，广告等。本论文主要针对欧洲EN ETSI300706（V1.2.1）标准，讨论研究如何解码模拟电视中的teletext信息，并对解码器在系统中的集成进行了说明，对teletext存储格式和字符替换功能进行了创新性的研究。主要内容有： 1.分析了该课题的研究意义和背景，对国内外的研究现状做了介绍。详细研究了EN ETSI300706（V1.2.1）标准中的teletext level1.5。介绍了在EN ETSI300706标准中，teletext信号的传输形式和每行信号的规定格式。参照EN ETSI300706标准对teletext level1.5中的每个packet的编码方式进行了描述，对每个packet中包含的内容进行了说明，并分析内容是否可用。对packet之间的信息关系进行了分析，概括了每个packet信息的影响范围。 2.详细论述了解码器的实现。首先介绍了解码器的整体架构，讨论了解码的思路和方法，说明了子模块的组成和子模块间数据的流向。按照每个packet的编码方式和信息的可用性介绍了packet解码子模块对每个packet的解码过程。讨论了解码器在teletext三种编码方式下的解码及纠错方法。介绍了数据解析子模块对解码后每个packet的数据的处理过程，其中详细介绍了数据解析子模块对包含字符替换功能的packet26包含的信息的重构，以及该过程下模块中相关逻辑的时序。在介绍存储控制模块时，讨论了数据解析模块处理后各个packet信息的存储方式，存储位置和输出数据到mem中的时序。对整个teletext数据在M EM中的存储空间的划分进行了说明。解释了在用户切换当前显示页的情况下存储空间如何在原有存储内容上进行较少改动的更新的滚动存储的机制。 3.论文给出了解码器的仿真结果，，对仿真环境及仿真所用的工具进行了说明。截取了部分仿真波形，并参照解码器的设计对波形进行了简单的解释。 4.最后讨论了解码器在电视系统中的集成，给出了一般情况下集成teletext解码模块的电视系统的结构图。对解码器前将数字信号的teletext正弦波信号转换为0/1非归零二进制码的采样模块做了可行的建议。对论文讨论的内容进行了总结，并对解码器以后的发展进行了展望。
[Abstract]:Teletext is a standard for transmitting text and simple image information on TV channels without additional bandwidth. Under this standard, TV service providers can provide program navigation information, life service information, instant news, advertising and so on. This paper mainly aims at European en ETSI300706 (V1.2.1) standard, discusses how to decode teletext information in analog TV, explains the integration of decoder in the system, and makes innovative research on teletext storage format and character replacement function. The main contents are: 1. The significance and background of the research are analyzed, and the present situation of the research at home and abroad is introduced. The teletext level of en ETSI300706 (V1.2.1) is studied in detail. In en ETSI300706 standard, the transmission form of teletext signal and the prescribed format of each line signal are introduced. According to en ETSI300706 standard, the encoding method of each packet in teletext level1.5 is described, the contents contained in each packet are described, and whether the content is available or not is analyzed. The information relationship between packet is analyzed, and the influence range of each packet information is summarized. 2. 2. The implementation of decoder is discussed in detail. Firstly, the whole architecture of the decoder is introduced, the idea and method of decoding are discussed, and the composition of the sub-module and the flow direction of the data between the sub-modules are explained. According to the encoding method of each packet and the availability of information, the decoding process of each packet by packet decoding submodule is introduced. The decoding and error-correcting methods of decoders in three teletext coding modes are discussed. This paper introduces the process of data processing of each packet after decoding by the data parse submodule, including the reconfiguration of the information contained by the packet26 containing character replacement function, and the timing of the related logic in the module. When introducing the storage control module, the storage mode, storage location and the timing of the output data to the mem after the processing of each packet information by the data parsing module are discussed. The partition of storage space of the whole teletext data in M-EM is described. This paper explains how to update the rolling storage mechanism of storage space with less changes on the original storage content in the case of user switching the current display page. The simulation results of the decoder are given, and the simulation environment and simulation tools are described. Some simulated waveforms are intercepted, and the waveform is explained simply according to the design of decoder. 4. Finally, the integration of decoder in TV system is discussed, and the structure diagram of TV system integrated with teletext decoding module is given. Some feasible suggestions are made for the sampling module which converts the teletext sinusoidal signal of the digital signal to 0 / 1 non-return-to-zero binary code before the decoder. The contents of this paper are summarized and the future development of decoder is prospected.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TN949.27;TN764

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