polycom会议系统培训要点解析.pptVIP

G.722.1 Annex C 14KHz音频算法 50/60场视频优化技术 动态端口分配 自动带宽调整 按设定时间自动轮训分会场的功能 演讲者功能 支持SIP协议 POLYCOM MGC-25 谢谢 * * * * * * * * Polycom has managed to penetrate nearly every industrial sector in China. We have recorded many successes particularly in the Government and telecom sectors. The Ministry of Agriculture are using Polycom products and solutions in 31 provinces while China Unicom uses our products in their IP video conference network which is the largest of its kind in the world. In the Asia Pacific region, hospitals and other healthcare providers are finding the value of using video conferencing for teaching, patient healthcare etc. We believe this sector will become just as important to Polycom in China and we are recording some success in the region but will be trying to gain further traction this year and beyond. Video Conferencing is increasingly being used for distance learning, not just in schools and universities but in major corporations, hospitals and government for training. And with our initiatives to increase regional distribution and working with China UniCom on their Uni-Video project, we intend to penetrate the small and medium enterprise sector. * Our blue-chip customers are a core Polycom asset This is not a comprehensive customer list – just a sampling of who we provide solutions to But -- represents the balance and diversity of verticals and geography 视频会议培训 基础知识 视频会议概述 视频会议 是一种通信设备 借用了许多成熟的电视技术 图像、语音的摄取 图像、语音的再现 不同于电视 高压缩比 低带宽 低延时 Video Audio 800:1 视频会议概述 视频会议技术组成 声音处理 图像处理 数据处理 人机界面 组网技术 国际标准 视频会议概述 图象捕捉和显示 图象压缩 声音捕捉和重现 声音压缩 网络协议和接口 外围设备接口 实时控制 常见视频会议国际标准组织 ITU-T和ISO/IEC JTC1是目前国际上制定视频编码标准的正式组织 ITU-T的标准称之为建议，并命名为H.26x系列，比如H.261、H.263等。ISO/IEC的标准称为MPEG-x，比如MPEG-1、MPEG-2、MPEG-4等。 H.26x系列标准主要用于实时视频通信，比如视频会议、可视电话等； MPEG系列标准主要用于视频存储(DVD) 、视频广播和视频流媒体（如基于Internet、 DSL的视频，无线视频等等）。 常见视频会议国际标准组织 除了联合开发H.262/MPEG-2标准外，大多数情况下，这两个组织独立制定相关标准。 1997年，ITU-T VCEG与ISO/IEC MPEG再次合作，成立了Joint Video Team (JVT)，致力于开发新一代的视频编码标准H.264。2002年12月，ITU-T在日本的会议上正式通