JH8000DTV数字电视实验系统概述......................................................3第一章视频A/D、D/A实验...................................................................61.1实验原理............................................................................................................................61.1.1视频A/D变换器.....................................................................................................61.1.2视频D/A变换器.....................................................................................................91.2实验电路..........................................................................................................................231.2.1实验电路总体框图................................................................................................231.2.2视频A/D变换电路模块.......................................................................................231.2.3视频D/A变换电路模块.......................................................................................271.2.4数字处理模块（可编程器件）............................................................................291.3实验内容..........................................................................................................................311.3.1实验一视频源的参数调整..................................................................................311.3.2实验二亮色延时实验........................................................................................341.3.3实验三量化比特数对数字图像质量的影响......................................................361.3.4实验四视频A/D，D/A参数的观测..................................................................391.3.5实验五数字电视的国际标准（ITU-601号建议）...........................................41第二章音频A/D，D/A实验.................................................................432.1实验原理..........................................................................................................................432.1.1音频信号取样频率的选择....................................................................................432.1.2声音信号（双极性信号）量化信噪比................................................................442.1.3音频信号的量化比特数的确定............................................................................442.2实验电路..........................................................................................................................452.2.1实验电路总体框图................................................................................................452.2.2音频AD系统模块电路简介................................................................................452.2.3音频AD系统模块电路简介................................................................................462.2.4数据处理与控制模块............................................................................................482.3实验内容..........................................................................................................................512.3.1实验一抽样频率及量化比特数对声音质量的影响..........................................512.3.2实验二观测各种时钟数据及其相互关系..........................................................541第三章MPEG视频编码................................................................
