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一般而言,逆程图文电视是指在电视信号场逆程中插入数据进行数据广播,用户通过带有图文电视接收功能的电视机或计算机接收图文数据广播。而正程图文电视则是利用计算机直接播出电视信号,其节目能被普通电视机接收。目前,许多电视台利用电视空闲时段或有线频道循环播出正程图文电视节目,内容有新闻和各种经济、文体信息等等。作为普通电视节目的有效补充,图文电视取得了良好的社会效益和经济效益。
In general, reverse teletext refers to the insertion of data in the reverse of the television signal field for data broadcasting, and the user receives the teletext data broadcast through the television or computer with the teletext receiving function. While the normal teletext is the use of computers directly broadcast television signals, the program can be ordinary television receiver. At present, many television stations use the television free time or cable channels to broadcast regular teletext programs in news, various types of economic, cultural and sports information and so on. As an effective supplement to ordinary television programs, teletext has achieved good social and economic benefits.