【作者】 刘强；

【导师】 国澄明；

【作者基本信息】 天津大学 ， 信号与信息处理， 2004， 硕士

【摘要】 数字电视是继黑白电视和彩色电视后的第三代电视。数字高清晰度电视则是数字电视在分辨率上的最高端模式。通过数字高清晰度电视机顶盒可以使用高清晰度电视收看高清晰度的数字电视节目，也可以用现有的模拟电视收看标准清晰度的数字电视节目。本论文完成的任务是设计与实现“新一代高清晰度数字电视机顶盒”项目中的信源解码器硬件部分。我们选用了ST公司的STi5514+STi7020高清晰度数字电视信源解码器方案。本论文详细介绍了高清晰度数字电视机顶盒信源解码器的STi7020及音视频输入输出部分的硬件构成和实现原理，以及电路板的设计方法。本部分系统的核心芯片是STi7020, 它是一个高集成度的音视频解码器，用于高清晰度数字电视、数字机顶盒等应用。它集成了一个MPEG MP@HL视频解码器，一个带有PCM混合的多标准音频解码器，一个带有7层显示平面的双输出图形合成器，2个视频显示流水线和2个视频定时产生器，用于两路节目同时观看和录像或两路节目以画中画或画外画配置显示，一个数字视频编码器。它的解码器功能强大，能同时最多解码5个SD流，或2个HD流，或1个HD和1个SD流。本系统提供模拟高清的YPrPb，模拟标清的CVBS、S端子和数字高清的DVI输出以及5.1声道音频和双声道音频输出，还有标清模拟视频和模拟音频的输入。更多还原

【Abstract】 Digital TV is the third generation TV after black and white TV and color TV. High definition television (HDTV) is the top grade of digital television. Through the digital HDTV Set-top box, we can receive the digital high definition TV program with HDTV or digital standard definition TV program with analog TV.The purpose of the paper is to research and implement the source decoder’s hardware of new generation HDTV set-top box. We chose ST’s HDTV source decoder solution with STi5514+STi7020. The hardware structure, the realizing principle of the STi7020 and audio/video IO system and the method of the PCB design are described in detail in this paper.The core of this part is STi7020 which is a highly integrated audio and video decoder for high-definition digital TV, digital set-top box application. It integrates an MPEG MP@HL video decoder, a DSP based multistandard audio decoder with PCM mixing, a 7 plane dual output graphics compositor with 3 graphics planes, a 2D graphics accelerator,2 video display pipelines and 2 video timing generators for dual program watch and record or dual program display in a PIP or POP configuration, a digital video encoder. The STi7020 can concurrently decode up to 5 SD video streams or 2 HD video streams or 1 HD video stream and 1 SD video stream.This system provides analog HD YPrPb, analog SD CVBS, S-Video, digital HD DVI output . 5.1 channel audio and 2-channel audio outputs are also provided. Externally sourced video and audio can also be input for mixing and presentation.更多还原