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要把Internet联人家庭,必须要有一种高速宽带接入方式。如何经济,有效地解决这一问题,利用现有的有线电视网(CATV)是一种有效的实现方法。下面就从视频点播的实现来讨论CATV在通信网络中的作用。 视频点播(VOD-Vedio On Demand)系统是当今研究的一个热点。视频点播作为宽带网上的多媒体应用,越来越受到人们的重视,用户可以通过客户终端设备,如机顶盒或多媒体PC等,按照自己的需求点播电视、电影节目。目前的电视用户只是被动的收看电视节目,而要想从“播什么节目”变成“想看什么节目就播什么”转变,这就是视频点播系统要实现的目标之一。
To bring the Internet together family, we must have a high-speed broadband access. How to solve this problem economically and effectively and utilize the existing CATV is an effective method. The following on the realization of video on demand to discuss the role of CATV in the communications network. VOD-Vedio On Demand (VOD-Vedio On Demand) system is a hot topic in today’s research. As a multimedia application on broadband Internet, video on demand has drawn more and more attention. Users can demand TV and movie programs according to their own needs through client terminal equipment such as set-top box or multimedia PC. The current TV users are passive watching television programs, but want to change from “broadcast what program” to “what program you want to watch broadcast”, which is one of the goals of VOD system.