【作者】 林健；

【导师】 余腊生；

【作者基本信息】 中南大学 ， 计算机应用技术， 2008， 硕士

【摘要】 数字电视是目前最具发展前景的产业之一,我国也推出自己了的地面数字电视广播标准—DMB-TH。在这种形势下,各种针对DMB-TH的数字电视产品都被开发出来,便携式移动电视接收机也是其中之一。本文依据作者参加的移动数字电视接收机项目写成,项目开发了一款可以实现随时、随地的接收播放电视节目的便携式电视接收机设备。本课题的主要就是研究移动电视接收机的设计与实现。接收机系统主要由信道接收、解调系统,TS流解复用系统,MPEG信源解码系统三大部分组成。本文根据数字电视接收机的组成,首先对本课题研究的接收机系统的软硬件总体方案做了讨论,分析了硬件平台、操作系统的选择及应用程序的关键设计;接着,对基于DMB-TH标准的调谐解调器的设计做了分析并完成相关驱动;接下来,讨论了用FPGA实现的PID硬过滤和由软件实现的section软过滤的分层结构的TS流解复用模块的设计,使用这种分层结构的TS流解复用方案既经济又有很大的灵活性,便于修改;与用户良好的交互是产品好坏的关键之一,用户接口模块就是实现与用户的交互功能,本系统依据硬件方案的OSD单元、触摸屏驱动芯片特点完成用户接口模块的实现,它分为输入模块、用户管理模块和输出模块,这样的分模块方式结构清晰,也具备一定的移植能力;最后,对系统运行的问题做了优化,优化的结果使系统性能得到了很大的提高。最后,在本项目结束后,移动接收机的样机已经制作出来,并进行了小批量的生产。样机可以方便的接收DMB-TH信号,并取得高质量的收看效果,达到预期目标。更多还原

【Abstract】 Digital TV is one of the most promising industries, and china has also launched its own digital television terrestrial broadcasting (DTTB) standard. Under this situation, various digital TV products based on DMB-TH have been developed, protable mobile TV receiver is one of them.This thesis is based upon a project the author participated in, the project is designed to develop a protable mobile multimedia equipment which can play digital TV at any time, any place. The design and implementations of a mobile TV receiver are mainly researched in this thesis. The TV receiver system consists of three parts: channel receiving and demodulating module, TS demultiplexer and MPEG decoder. According to the constituation of the receiver, the follow contents are discussed in this thesis: Firstly, the software and hardware system of the TV receiver is studied, such as hareware platform, OS and the key design of the application; Secondly, a tuner driver is designed, the tuner adopts DMB-TH standard; thirdly, a method using FPGA to realize PID filter and software to realize section filter is given, which is economical, flexible and easily upgrade; A intuitive and attractive Human Machine Interaction is crucial to mobile products, the user interface module is made for use digital TV recevicer easily, so fourthly, a user interface module is realized, it’s hardware layer based on OSD unit and touch screen controller, it divides into three module: input module, user manage module and ouput module, it has a clear framework and has transplantate possiblity; At last, some problems of the system is optimized at the end of the thesis.After the project is done, the sample machine of the mobile TV receiver has been made. The sample receiver can receive DMB-TH signal expediently and play TV fluently, which reach the expectant goal.更多还原