{ "$schema": "/api/schemas/documents.schema.json", "apiVersion": "1.0.0", "generatedAt": "2026-07-09T21:16:49.031Z", "sourcePath": "src/main/data/docs", "docId": "10.5594-M00442", "document": { "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.", "abstract$meta": { "confidence": "high", "note": "Backfilled from SMPTE canonical repository (smpte-canonical-audit/canonicalLibrary.*.json)", "originalValue": null, "source": "parsed", "updated": "2026-07-08T00:35:38.133Z", "version": "smpte-canonical-repo@v1" }, "authors": [ { "affiliation": "Department 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.", "name": "J. R. Storey" }, { "affiliation": "Department 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.", "name": "H. G. Bown" }, { "affiliation": "Department 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.", "name": "C. D. O'Brien" }, { "affiliation": "Department 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.", "name": "W. Sawchuk" } ], "authors$meta": { "confidence": "high", "note": "Object form (schema 2.3.0) migrated from string form via migrateAuthorsToObjectForm.js; bio/affiliation backfilled from _source/SMPTE/HIGHWIRE/ NLM ++", "source": "parsed", "updated": "2026-06-23T00:04:25.562Z", "version": "authors-migrate-object-form@v1" }, "contentType": "orig-research", "contentType$meta": { "confidence": "high", "note": "Canonical-confirmed full paper (summary-abstract set is orig-research in the SMPTE canonical repos); HIGHWIRE-era abstract label was a delivery artifact", "originalValue": "summary-abstract", "source": "resolved", "updated": "2026-07-09T19:12:47.628Z", "version": "contenttype-fixes@v1" }, "copyright": { "holder": "Society of Motion Picture and Television Engineers, Inc.", "holder$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "year": "1980", "year$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" } }, "copyright$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "docId": "10.5594-M00442", "docId$meta": { "confidence": "high", "note": "Derived from DOI 10.5594/M00442", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "docLabel": "SMPTE Meetings and Conferences ( February 1980)", "docLabel$meta": { "confidence": "medium", "note": "Composed from venue title, volume/issue and date", "source": "inferred", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "docTitle": "Overview of Broadcast Teletext Systems for NTSC Television Standards", "docTitle$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "docType": "Conference Paper", "docType$meta": { "confidence": "high", "note": "NLM
— SMPTE conference paper", "source": "inferred", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "doi": "10.5594/M00442", "doi$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "href": "https://doi.org/10.5594/M00442", "href$meta": { "confidence": "high", "note": "Constructed from DOI 10.5594/M00442", "source": "inferred", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "number": "13", "number$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "pages": "116–129", "pages$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "publicationDate": "1980-02-01", "publicationDate$meta": { "confidence": "high", "note": "Day absent in NLM source — padded to 01", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "publisher": "SMPTE", "publisher$meta": { "confidence": "high", "note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)", "source": "inferred", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "publisherLocation": { "city": "White Plains, NY", "city$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" } }, "publisherLocation$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" }, "references": { "bibliographic": [ "orphan/10.5594-M00442/bibr1-10.5594_M00442", "orphan/10.5594-M00442/bibr2-10.5594_M00442", "orphan/10.5594-M00442/bibr3-10.5594_M00442", "orphan/10.5594-M00442/bibr4-10.5594_M00442", "orphan/10.5594-M00442/bibr5-10.5594_M00442", "orphan/10.5594-M00442/bibr6-10.5594_M00442", "orphan/10.5594-M00442/bibr7-10.5594_M00442", "orphan/10.5594-M00442/bibr8-10.5594_M00442", "orphan/10.5594-M00442/bibr9-10.5594_M00442", "orphan/10.5594-M00442/bibr10-10.5594_M00442", "orphan/10.5594-M00442/bibr11-10.5594_M00442", "orphan/10.5594-M00442/bibr12-10.5594_M00442", "orphan/10.5594-M00442/bibr13-10.5594_M00442", "orphan/10.5594-M00442/bibr14-10.5594_M00442", "orphan/10.5594-M00442/bibr15-10.5594_M00442", "orphan/10.5594-M00442/bibr16-10.5594_M00442", "orphan/10.5594-M00442/bibr17-10.5594_M00442", "orphan/10.5594-M00442/bibr18-10.5594_M00442" ], "bibliographic$meta": { "confidence": "medium", "note": "Extracted from NLM via extractSmpteConferenceRefs.js (orphan-slug-mint)", "source": "parsed", "updated": "2026-07-06T20:02:43.384Z" } }, "resolvedHref": "https://journal.smpte.org/conferences/Digital%20Video%20Volume%203:%2014th%20SMPTE%20Television%20Conference/15/", "resolvedHref$meta": { "confidence": "high", "note": "Backfilled from url.validate report #resolvedHref", "originalValue": null, "source": "resolved", "updated": "2026-06-19T20:59:07.439Z" }, "status": { "active": true, "active$meta": { "confidence": "medium", "note": "No explicit status in NLM source — conference papers default active", "source": "inferred", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" } }, "volume": "1980", "volume$meta": { "confidence": "high", "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptem/10.5594_M00442.xml)", "source": "parsed", "updated": "2026-05-22T21:44:19.125Z", "version": "smpte-conference-paper-nlm@v1" } } }