Abstract
The parameters defining the UK teletext transmission standard were set in 1974 after some two years of intensive theoretical and practical investigations. There were available a multitude of possible combinations of binary signalling schemes, screen formats, character coding and control-coding methods. Many possibilities were assessed before a final choice was made in favour of the 40character × 24row fixed-format synchronous transmission system of the UK teletext specification. The paper discusses the reasons behind the selection of the many parameters defining the UK teletext standard, and why in particular a free-format composite character coding scheme is rejected as quite unsuitable for a broadcast data service. Teletext has been available as a public service in the UK for several years. The soundness of the UK teletext standard is being affirmed by the increasing thousands of viewers who, with a teletext receiver bought at low additional teletext cost, are now enjoying a reliable, error-free, efficient and effective domestic information service.
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