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文字多重广播,是一种新型的附属广播业务。它利用电视信号场消隐期间本来无用的行传送文字和简单图形信息,并显示在适当装备的家用电视机屏幕上。它有着许多用途和巨大的潜力,近年来在许多国家和国际机构中很受重视。英国是文字广播发展最早的国家,已开始正式播送。在英国的系统中,采用文字编码传送方式,用一电视行传送显示画面上一行文字,电视行中的数据位置与画面上的文字位置一一对应,有固定的关系。法国的文字广播仍处在试验阶段,采用的也是文字编码传送方式,但电视行中的数据位置与画面中的文字位置没有固定关系。日本正在评价其文字广播系统,与英法两国的文字编码传送方式不同,为了解决汉字传送问题,目前采用的是图案传送方式。
Text multiplex broadcasting, is a new type of satellite broadcasting service. It uses textual and simple graphic information that was originally useless during the blanking of the television signal field and displays it on the screen of a suitably equipped home TV set. It has many uses and great potential, and in recent years has gained much attention in many countries and international agencies. Britain is the earliest developing country for text broadcasting and has officially started broadcasting it. In the British system, the use of text encoding transmission, with a television line to send a line of text on the display, the TV line data location and text on the screen one-to-one correspondence, a fixed relationship. The French version of the teletext is still in the experimental phase and uses a text-encoded transmission, but the location of the data in the television line is not fixed in relation to the position of the text in the picture. Japan is evaluating its teletext system, which is different from the way of transcribing text codes between Britain and France. In order to solve the problem of transmitting Chinese characters, the pattern transmission is currently used.