论文部分内容阅读
图文电视也叫可视图文,英文名字为TELETEX,直译过来是“远距离传递图文”的意思。“图文电视”说白了是一本“电视杂志”。普通杂志由一页页纸组成,电视杂志则是以荧屏代替纸张,用户根据需要可以由遥控器控制,任选页面一幅一幅地看。如果嫌图文小看不清可以将它放大。 随着电视节目日益丰富多彩,现在电视用的频道愈来愈显得拥挤。如果电视台专门开辟一个频道传递图文电视节目,既不可能,也不经济。为了一举两得;可将由文字和图形构成的信息采取见缝插针的方法,叠加在电视信号中传送。最常见的是采用“场消
Teletext, also known as visual graphics, the English name for TELETEX, literal translation is “long-distance transmission of graphic” meaning. “Teletext” plainly is a “TV magazine.” General magazine consists of a page of paper, TV magazine is a screen instead of paper, the user according to need by the remote control, optional page one by one to see. If you look too small picture can not be enlarged it. With the increasing variety of television shows, the channels used by television are increasingly crowded. It is neither possible nor economical for a television station to open a channel to deliver teletext. In order to serve the best of both worlds, information composed of words and figures can be obtained by superimposing on a television signal and transmitting it. The most common is the use of "field elimination