视频会议系统技术方案2010-12-20目录第1章项目需求分析...................................................................................................................11.1项目背景..............................................................................................................................11.2本次建设要求......................................................................................................................11.3建设达到目的......................................................................................................................11.4承载网络分析......................................................................................................................3第2章视频会议行业背景..........................................................................................................52.1概述......................................................................................................................................52.2H.264成为主流编码标准...................................................................................................62.2.1H.261视频编码............................................................................................................62.2.2H.263视频编码............................................................................................................72.2.3H.264视频编码............................................................................................................72.3宽带音频成为共同的追求.................................................................................................72.3.1G.711基本音频............................................................................................................72.3.2G.711.............................................................................................................................72.3.3G.722、G.722.1............................................................................................................82.3.4G.722.1AnnexC...........................................................................................................82.3.5G.719.............................................................................................................................82.4高清图像成为划时代的标准.............................................................................................92.4.1图像分辨率提升........................................................................................................112.4.216：9，可视范围增加..............................................................................................122.4.3逐行扫描，图像无闪烁...........................................................................................122.5高清视频会议的优点.......................................................................................................12第3章系统设计原则与规范....................................................................................................143.1设计原则............................................................................................................................143.2规范、标准和设计依据...................................................................................................163.2.1ITU-T标准.................................................................
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