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1994年,美国有线电视系统为方便用户,推出了一项新举措:用户想看什么电视节目,电视台就能投其所好,专门为他播放。这种新颖的电视称作“交互电视”(VOD)。 自电视问世以来,用户收看电视(无论是收看无线广播、电视还是有线电视)都是受电视台控制。电视台播放什么节目,用户就收看什么节目。由于用户各有所好,很难满足众人欣赏口味。“交互电视”的诞生,可做到“屏随人愿”,使用户各取所需。 交互电视靠电子计算技术、视象技术和通信技术发展之大成,以电子计算机、多媒体终端和高速率、大容量通信网络为支撑,利用有线电视网来实现。有线电视台在用户集中居住的小区建立电视播放中心,中心内部设置拥有成千上万个电视节目的“节目库”。用户查阅节目单,通过安在家中的交互电视终端,象现在电台“点歌”那样,通过通信信道“告诉”电视播送中心,播送中心就可按用户要求供其所需。用户在收看过程中还可根据自己爱好选看有关节目,喜欢看的部分可以让画面慢些走,或干脆让画面停住,或倒回来再看一遍,细细欣赏。对不喜欢看的部分,可以让
In 1994, the US cable television system introduced a new initiative for the convenience of users: what television programs the user wants to watch, the television station can make a difference and play it exclusively for him. This new type of television is called “interactive television” (VOD). Since the advent of the TV, users have been watching TV (whether watching radio, television or cable television) are controlled by the television station. What program is broadcast by the television station and what program the user watches. Due to the user’s own good, it is difficult to satisfy everyone taste. The birth of “interactive television” can be “screen with people’s wishes,” so that users get what they want. Interactive television by electronic computing technology, video technology and communications technology development culminated in electronic computers, multimedia terminals and high-speed, high-capacity communications network as the support, the use of cable television network to achieve. The cable television station sets up the television broadcast center in the residential area where the user lives concentratedly, and has set up a “program library” with tens of thousands of television programs in the center. Users access the program list, through the interactive television terminal in the home, as the current radio “song” that channel through the communication channel “tell” TV broadcast center, broadcast center according to user requirements for their needs. Users can watch the program according to their preferences to see the program, like to see the part can make the picture go slower, or simply let the picture stopped, or rewind to see it again, carefully read. Do not like to see the part, you can make