ExtraVision

ExtraVision was a short-lived teletext service created and operated by the American television network CBS in the early to mid-1980s.[1][2][3][4] It was carried in the vertical blanking interval of the video from local affiliate stations of the CBS network. It featured CBS program information, news, sports, weather, even subtitling[5] for CBS programming (much like page 888 in British/European teletext, and American closed captioning). ExtraVision could also have its pages customized by the local affiliate station carrying it, for such things as program schedules, local community announcements, and station promotions.

Not to be confused with Xtra-vision.
ExtraVision
ExtraVision index page, 1984
DeveloperCBS
TypeTeletext
Launch date1983
Discontinued1988
Platform(s)NABTS
StatusDiscontinued

ExtraVision was discontinued by CBS towards the end of the 1980s, due to the service using the NABTS protocol, which required a quite expensive decoder to receive the service. Also, most of the local CBS affiliates carrying the ExtraVision service did not bother to invest in the computer equipment required to customize pages to carry locally oriented information on the service.

CBS had begun tests in 1979 using the French Antiope system,[6] and again in 1981 in the Los Angeles area.[7][8][9] The full ExtraVision service began in April 1983[5][10][11] on CBS affiliate WBTV in Charlotte, NC,[12][13] and went nationwide in 1984. It was cancelled in 1988,[6][14][15] three years after NBC Teletext had also been abandoned by NBC.

References
  1. Graziplene, Leonard R. (2000). Teletext: Its Promise and Demise. ISBN 9780934223645.
  2. "Popular Science". September 1984.
  3. "Mb21 - ether.net - the Teletext Museum - World".
  4. Shafer, Jack (2009-01-06). "How the newspaper industry tried to invent the Web but failed". Slate Magazine. Retrieved 2022-12-15.
  5. Technology, United States Congress House Committee on Science and Technology Subcommittee on Science, Research, and (1984). Developing Technologies for Television Captioning: Benefits for the Hearing Impaired : Hearing Before the Subcommittee on Science, Research, and Technology of the Committee on Science and Technology, U.S. House of Representatives, Ninety-eighth Congress, First Session, November 9, 1983. U.S. Government Printing Office. p. 35.
  6. "ExtraVision". iml.jou.ufl.edu. Retrieved 2022-12-15.
  7. Technology, United States Congress House Committee on Science and Technology Subcommittee on Science, Research, and (1984). Developing Technologies for Television Captioning: Benefits for the Hearing Impaired : Hearing Before the Subcommittee on Science, Research, and Technology of the Committee on Science and Technology, U.S. House of Representatives, Ninety-eighth Congress, First Session, November 9, 1983. U.S. Government Printing Office. p. 36.
  8. Marketing Communications. United Business Publications. 1981.
  9. "Broadcast Teletext, 1980". www.richardgingras.com. Retrieved 2022-12-15.
  10. Enterprise, I. D. G. (1983-04-11). Computerworld. IDG Enterprise. p. 14.
  11. Ap (1983-04-05). "CBS STARTS ITS TELETEXT SERVICE". The New York Times. ISSN 0362-4331. Retrieved 2022-12-15.
  12. Corporation, Bonnier (September 1984). Popular Science. Bonnier Corporation. p. 40.
  13. "Timeline". www.wbtv.com. Retrieved 2022-12-15.
  14. Gillies, Donald (1989). Technological Determinism In Canadian Telecommunications: Telidon Technology, Industry and Government. Ryerson Polytechnical Institute. p. 6. doi:10.22230/cjc.1990v15n2a549 (inactive 2023-01-29).{{cite book}}: CS1 maint: DOI inactive as of January 2023 (link)
  15. Downey, Gregory J. (2008-02-25). Closed Captioning: Subtitling, Stenography, and the Digital Convergence of Text with Television. JHU Press. p. 224. ISBN 978-0-8018-8710-9.
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