VOD广播协议族  

Video on Demand Protocols

作　　者：苏磊[1] 左晓宁[2] 

机构地区：[1]北京信息技术研究所,北京100088 [2]北京航空航天大学,北京100083

出　　处：《中国有线电视》2003年第23期24-28,共5页China Digital Cable TV

摘　　要：真视频点播 (T -VOD)技术支持双向点播 ,点播延迟短 ,因而成为技术热点。但该技术带来的双向网络改造费用大 ,一般多用在局域网中。而准视频点播技术 (N -VOD)无需改造网络即可实现视频点播 ,在有线电视等宽带网中应用广泛。以准视频点播技术为背景 ,通过对VOD广播协议族进行归纳和分析 ,从而加深人们对N -VOD技术的理解。The T-VOD technology becomes the technological focus with its interactive service mode and short delay. But it brings a big problem that the reconstructor expenses of the network is costliness, and it makes the T-VOD technology commonly used in the local network. On the other hand, the N-VOD technology can order program without the network reconstructor, and this makes that the N-VOD technology is applied widely in the CATV network and other wide band network. This paper in the context of the N-VOD technology, concludes and analyses this technology's core knowledge - VOD broadcasting protocols.

关 键 词：真视频点播 交错广播协议 锥形广播协议 快速广播协议 宝塔广播协议 调和广播协议 VOD 

分 类 号：TN948.64[电子电信—信号与信息处理]