VOD由视频服务器、计费计算机、用户请求处理计算机、网络、用户端机顶盒等基本部分组成,一部分是节目分配设备,包括信号融合打包器、接收器、用户选择计算机、记帐和登记计算机、服务器、编码器、混合器、调制器和传送器;另一部分为用户部分,包括了信号解包器、解调器、解压缩器、宽带视频/音频接收机、用户接口及节目选择接口。下面对其中涉及到的主要技术做一概述。 VOD by the video server, billing computer, user request processing computer, network, client STB and other basic components, part of the program distribution equipment, including signal fusion packer, receiver, the user selects the computer, accounting and registration of computers, servers , Encoders, mixers, modulators and transmitters; the other part is the user part, including signal unpacker, demodulator, decompressor, broadband video / audio receiver, user interface and program selection interface. Here’s a summary of the main technologies involved.