Overview of Broadcast Teletext Systems for NTSC Television Standards

Metadata

Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 1980, No. 13, pp. 116–129
Abstract: The development of the British teletext and viewdata systems has sparked a new interest in information services for the general public. In this paper, the term broadcast teletext is used to refer to one-way broadcast information services whereas the generic term, videotex, is used to refer to interactive services carried over public telephone networks. Broadcast teletext refers to the transmission of digital data for direct reception by the public. It is intended to provide a limited one-way information service through the cyclic repetition of pages of information transmitted as ancillary signals on normal television programs. The information contained in both videotex and broadcast teletext signals is received by suitably supplemented television receivers and displayed on the television screen as textual messages or graphic images. Two spare lines in the Vertical Blanking Interval (VBI) of each field of the television signal are used in the United Kingdom to transmit teletext signals, but more lines could be dedicated to this use if they became available. The use of only two lines in the VBI provides a strictly limited service with the public only having access to a few hundred pages of information. However, as it is a broadcast service, all members of the public with teletext decoders and within range of the television station can access the information at the same time. Of course, a much improved one-way broadcast service could be provided by using the full bandwidth of a television channel to provide public access to a few thousand pages of information. This could easily be provided on cable television networks in North America which often have sufficient bandwidth for up to 35 television channels. On the other hand, people with videotex decoders can have access to data bases containing over 100,000 pages by communicating interactively over the public telephone network: but in this case, the service may be limited to only a few hundred users at a time. Cable television operators with two-way networks could also provide an interactive service of this kind. Other configurations are feasible and include hybrid configurations in which page requests are transmitted over the telephone network to an information supplier who then inserts data in the broadcast teletext cycle of the local television station.
Publication Date: 1980-02-01
DOI: 10.5594/M00442
Link: https://doi.org/10.5594/M00442
Author(s): J. R. StoreyDepartment of Communications Research Center, Ottawa, Ontario, Canada
bio
John Storey has over 30 years of experience in the fields of electronics and communications. Since joining the Communications Research Centre in Ottawa, Canada, in 1959, he has been involved in research and development in a number of areas. These areas include pulse compression techniques for ionospheric sounding, adaptive receivers for data transmission, Teleconferencing systems and automated noise measurements of the HF communication spectrum. He was one of the participants in the development of the Canadian Videotex system, Telidon, and is now responsible for the broadcast aspects of the program.
H. G. BownDepartment of Communications Research Center, Ottawa, Ontario, Canada
bio
Herbert G. Bown was born in Badger's Quay, Newfoundland, Canada. He studied in St. John's and Nova Scotia Technical College in Halifax, where he received his Bachelor and Masters Degrees in Electrical Engineering. He joined the Defence Research Telecommunications Establishment and remained with them when it became the Department of Communications in 1969. Mr. Bown is Director General of Information Technology of the Department of Communications. As Manager of the Image Communications Program, he was responsible for the Research and Development activities which resulted in the Telidon concept. Prior to that, he had a variety of research and development experience in telecommunications and electronic data processing systems. Mr. Bown is a member of ACM, IEEE, CIPS, and APEO.
C. D. O'BrienDepartment of Communications Research Center, Ottawa, Ontario, Canada
bio
C. Douglas O'Brien was born in Ottawa, Canada and graduated from Carleton University with a Master of Engineering in 1975. When he joined the Communications Research Centre he participated in the development of software and hardware techniques of a number of patents in the image communications area. Mr. O'Brien has been one of the prime researchers in the development of Telidon.
W. SawchukDepartment of Communications Research Center, Ottawa, Ontario, Canada
bio
William Sawchuk (Bill) was born in Weirdale, Saskatchewan. He studied at the University of Calgary where he obtained his Ph.D. in Physics. Following his graduation he worked as a Research Fellow with the same University. In 1974 he joined the Image Communications Group of DOC as a Research Scientist. He has been active in development of techniques for interactive image communications over narrowband lines. More recently, he has been one of the participants in the development of the Canadian videotex system, Telidon. He is presently Acting Manager of Image Communications.
Copyright: © 1980 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Chew J. R. , “CEEFAX: Evolution and Potential” , BBC report RB 1977/26, August 1977, Research Department, Engineering Division, The British Broadcasting Corporation . EXTERNAL
10. Crowther G. A. , “Teletext and Viewdata Systems and their Possible Extension to Europe and USA” . Ibid pp 288 – 293 . EXTERNAL
11. Marti B. , “New Ancillary Services Using a Television Channel” , SMPTE Journal , 80 , November 1977 , pp 815 – 818 . EXTERNAL
12. Numaguchi Yasutaka Harada Shunjiro Uehara Takashi , “Compatibility and Transmission Characteristics of Digital Signals Inserted in the Field-Blanking Interval of a Television Signal” . NHK Laboratories Note, Serial No 216, NHK Technical Research Laboratories, September 1977 . EXTERNAL
13. Numaguchi Y. Harada S. Uehara R. , “Experimental Studies of Transmission Bit-Rate for Teletext Signal in the 525-line Television System” . IEEE Transactions on Broadcasting. EXTERNAL
14. Bown H.G. Sawchuk W. Storey J. R. , “Telidon: Coding and Hardware Considerations for Broadcast Applications” , National Electronics Conference, NEC/79, Chicago, October 1979 . EXTERNAL
15. “Teletext Field Tests in Bavaria” , published jointly by BBC, IBA and Institut fur Rundjunktechnik , August 1976 . EXTERNAL
16. Dublet G. , “Methodes utilisees et principaux resultats obtenus lors d'une campagne de mesure “DIDON” dans la region centre-est” . Revue de radiodiffusion-television No 54, 1978 . EXTERNAL
17. Kuhn T. G. , “Retransmission Error Control” , IEEE Transactions on Communication Systems , June 1963 , pp 186 – 201 . EXTERNAL
18. Sablatash M. Storey J. R. , “Determination of Throughputs, Efficiencies and Optimal Block Lengths for an Error Correction Scheme for the Canadian Broadcast Telidon System” , submitted for presentation at ICC 80, International Conference on Communications, Seattle, Washington, June 8–11, 1980 . EXTERNAL
2. Fedida S. , “Viewdata: An Interactive Information Service for the General Public” , Proceedings of the European Computing Conference on Communication Networks, 1975 . EXTERNAL
3. Specification of the Teletext, Antiope (English Translation) CCETT Report, TSA/DT/24/77 , Centre Commun d'etudes de television et telecommunications , Rennes, France , November 1977 . EXTERNAL
4. Marti B. Poignet A. Schwarts C. Michon V. , “The Antiope Videotex System” , IEEE Transactions on Consumer Electronics , Volume CE-25 , Number 3 , July 1979 , Special Issue on Consumer Text Display Systems (Teletext and Viewdata), pp 327 – 333 . EXTERNAL
5. Bown H. G. O'Brien C. D. Sawchuk W. Storey J. R. , “A General Description of Telidon: - A Canadian Proposal for Videotex Systems” , CRC Technical Note No 697-E, December 1978 , Department of Communications , Ottawa, Canada . EXTERNAL
6. “Teletext System for Ideographic Information” , NHK Technical Research Laboratories. EXTERNAL
7. “Broadcast Teletext Specification” , published jointly by BBC, IBA and BREMA , September 1976 . EXTERNAL
8. “Teletext Systems for 525/60 Field Telvision” , BBC, IBA and BREMA , August 1979 . EXTERNAL
9. O'Connor R. A. , “Teletext Field Test” , IEEE Transactions on Consumer Electronics , Volume CE-25 , Number 3 , July 1979 , pp 304 – 310 . EXTERNAL

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J. R. Storey, H. G. Bown, C. D. O'Brien, and W. Sawchuk; Overview of Broadcast Teletext Systems for NTSC Television Standards, SMPTE Meetings and Conferences ( February 1980); SMPTE, 1980. Available at https://doi.org/10.5594/M00442

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J. R. Storey, H. G. Bown, C. D. O&#x27;Brien, and W. Sawchuk; Overview of Broadcast Teletext Systems for NTSC Television Standards, SMPTE Meetings and Conferences ( February 1980); SMPTE, 1980. Available at https://doi.org/10.5594/M00442

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