数据广播的发展与思考

数据广播是第三种类型的广播。本文从分析数据广播的定义与分类出发，简要综述了调频多工数据广播的发展历史与现状，分析了它的主要作用；简要介绍了调幅多工数据广播的进展。综述了欧洲图文电视、隐蔽字幕、电传软件、收费数据广播与ＰＤＣ的发展，分析美国隐蔽字幕“２１行业务”的新进展与日本的电视传真广播的发展。最后对发展我国数据广播提出了看法与建议。

A Review of Data Broadcasting

Data broadcasting is the third broadcasting service category. Beginning with the concept and classification of data broadcasting, the paper outlines briefly the development history and current situation of FM multiplex data broadcasting, and analyses its main applications, as well as the development of AM multiplex data broadcasting. The paper also discusses the develop ment of European teletext, closed caption, telesoftware, datacast and PDC. It analyses the new development of Line 21 closed captioning service in USA and TV facsimile broadcasting in Japan. It concludes with suggestions of development of data broadcasting in China.