CEEFAX: A Proposed New Broadcasting Service

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Field trials are being completed of a BBC system which can transmit a “magazine” of 32 “pages” of text for display on a home TV screen. The information is conveyed in digital form using the ASCII 7-bit code. In the 625-line 50-field television system the data signal is inserted on lines 17 and 18 together with the corresponding lines (330 and 331) in the alternate field and the bit rate of 4.5 Mb/s during the transmission of the signal leads to an average bit rate of 23.4 kb/s. The complete magazine is sent in 15.36 s. Special CEEFAX TV receivers or adapters for use will ordinary sets decode the signals and store the data for the page selected by the user: the store is read every field via character-generating circuits which provide the video signals to form the alphanumeric display. Weather forecasts, news items, and subtitles are among the subjects suitable for CEEFAX which could also be adapted to take library reference material, bank statements, etc. from the telephone line or a shelf-full of books from a single video disc. A Technical Study Group is examining this system, a comparable one developed by the Independent Broadcasting Authority, and proposals from British industry, and will recommend characteristics for a single data broadcasting service.
Publication Date: 1974-01-01
DOI: 10.5594/J07617
Link: https://doi.org/10.5594/J07617
Author(s): S. M. Edwardson, A. Gee

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S. M. Edwardson and A. Gee; CEEFAX: A Proposed New Broadcasting Service, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J07617

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S. M. Edwardson and A. Gee; CEEFAX: A Proposed New Broadcasting Service, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J07617

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S. M. Edwardson and A. Gee; CEEFAX: A Proposed New Broadcasting Service, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at https://doi.org/10.5594/J07617

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<span class="citation">S. M. Edwardson and A. Gee; <cite>CEEFAX: A Proposed New Broadcasting Service</cite>, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974. Available at <a href="https://doi.org/10.5594/J07617" target="_blank" rel="noopener">https://doi.org/10.5594/J07617</a></span>

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S. M. Edwardson and A. Gee; CEEFAX: A Proposed New Broadcasting Service, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974
doi: 10.5594/J07617
url: https://doi.org/10.5594/J07617

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S. M. Edwardson and A. Gee; <cite id="bib-10-5594-j07617">CEEFAX: A Proposed New Broadcasting Service</cite>, Journal of the SMPTE ( Volume: 83, Issue: 1, January 1974); SMPTE, 1974
<span class="doi">10.5594/J07617</span>
</li>