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随着电视制造技术的发展,人们安坐家中就能看到几十个甚至上百个频道的电视节目,但从服务角度来看,这种电视服务仍是单向的,放什么节目就看什么节目,超出播放计划以外的节目就不能提供。正是这种局限性让电视制造专家们感到了压力,促使他们开发双向性电视,即电视台可以按自己的计划播放节目,而观众也可根据自己的喜好和需求让电视台播放某些节
With the development of television manufacturing technology, people can see dozens or even hundreds of channels of television programs at home, but from a service point of view, the television service is still unidirectional, and what programs Programs beyond the broadcast program can not be provided. It is this limitation that puts television manufacturing professionals under pressure to develop two-way television programs that allow television stations to broadcast their own programs, while viewers can also make television stations broadcast certain sections according to their preferences and needs