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An History of Videotex the UK Teletext

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An History of Videotex the UK Teletext An History of Videotex From Videotex to the WWW Digital Information Retrieval Services : the french experience and european competition from the 70s Bernard Marti An History of Videotex The origins 1967 In France, Color TV is just starting, using the SECAM system Social behaviour based on TV set purchase In UK, the service based on PAL has already been in operation for 2 years Social behaviour based on TV set renting Looking for new services 1965 1966 1967 An History of Videotex The U.K. Teletext Actors BBC (British Broadcasting Corporation) IBA (Independant Broadcasting Authority ) BREMA (British Radio Equipment Manufacturer's Association) Dates 1968 :First CEEFAX (See Facts) experiments First ORACLE ( Optionnal reception of Announcements by Coded Line Electronics) Experiments 1974 : first joint specifications 1976 : UK Teletext experimental service opens 1979 : UK Teletext public service opens What is the principle of this service? An History of Videotex An History of Videotex The principle of Teletext (2) page 1O4 lines 576 visible Consult the ORACLE 625 lines CONTENTS SUMMARY 11O Sports Use "free" lines of 118 Weather 134 Gardening to-day VBI to transport digital data Decode data & build a locally generated image data line An History of Videotex Innovations P15 CEEFAX 100 Mon 17 Jul 13:01/09 mosaic (block- graphic) NEW-LOOK BBC 1 MAGAZINE : Many regular pages now have new nombers. This is the characters basic pattern of the magazine : 101 NEWS HEADLINES NEW 101-119 News in detail Colour FULL 120 FINANCE HEADLINES INDEX 130 FT INDEX alphanumeric 140 SPORT HEADLINES A-F 193 display 161 FOOD GUIDE G-0 194 180 WEATHER AND TRAVEL INDEX P_Z 195 ( attributes ) 181 WEATHER FORECAST 171_173 TV GUIDES NEWSFLASH 150 LATEST PAGES 190 Character synthesis in a consumer terminal device data multiplexing in the television signal An History of Videotex An History of Videotex teletext user interface A magazine is broadcast cyclically magazine selection page selection Special modes MAG PAGE CAP subtitles 1 2 3 news-flash 4 5 6 wait mode 7 8 9 * 0 # MAG O3 PAGE ? An History of Videotex French pionniers : S.C.T and TicTac The context (1970) Computers are heavy and expansive Touchtone keyboards are being introduced Service deCalcul par Téléphone Ergonomie lourde Evolution (1973) Apparition of hand-held computers Birth of first computer Telephone Information Retrieval Service + Integrated Terminal Including a TV Set and a calling keyboard An History of Videotex The "Telephone Computation Service" S ervice de The Dialogue of C alcul par T éléphone touches 1 - soustraction SIN sinus appel du SCT A B C D E F 2 COS cosinus 1 2 3 * multiplication initialisation 3 / division ATG arc tangente demande de répétition relance du SCT (1) G H I J K L M N 4 ^ élevé à la puissanceLGN logarithme népérien { effacement de l'écran (2) 4 5 6 5 ( facteur de EXP exponentielle X 6 ) fin de parenthèse TGH tangente hyper. Y P R S T U V W X Y 7 . point RAC racine carrée Z 7 8 9 8 E dix à la puissanceABS valeur absolue effacement d'un nombre + addition NEG opposé rappel du registre T O Q 9 0 0 = égale FOR format M abandon du SCT (1) valable uniquement sur un poste téléphonique (2) valable uniquement à partir d'un visiophone An History of Videotex ANTIOPE The context (1974) Le CCETT, created in 1972, new Joint Study Center on Television and Telecommunications is experimenting PSDN (TRANSPAC) The State Broadcast authority is being splitted in parts Technical parameters U.K. Teletext is very integrated (Presentation and network layers parameters are completely mixed) It only allow writing in English (no diacritical signs) It is very closed and considered as non expandable An History of Videotex Mosaic Mode Recalling about display consoles Character Page ABCDEFD Character shapes store XYZ codes Store Screen Time base Alphanumeric characters Mosaic characters An History of Videotex ANTIOPE (2) Broadcasters are very sensitive to the international context Importance of standardisation st 1 study : analysis of 39 european languages(1976 -1977) the problem is put on the international scene CCIR 1976 (now ITU-R) Specific opportunities : the case of atelephone - SPORT 76 based version is raised September 1977 : Internationale Funkausstellung Théry-Souviron : decision to launch the Vélizy project Publication of the first ANTIOPE specifications An History of Videotex Funkausstellung, Berlin 1977 Berlin TV1 Strasbourg Dedicated link Concentrator TV1 TRANSPAC TV1 Rennes Server Concentration Protocols Conversion User access An History of Videotex Serial Mode (1) function code displayed as a space Upper Case on Blue Background function code displayed as a space Row leading space An History of Videotex Serial Mode (2) cyan mosaics mosaics hold new background alpha blue alpha white new background alpha red An History of Videotex Parallel Mode No leading space Lower case possible on mosaics Accented letters Changing attributes without space, even in the middle of a word Simpler to produce Lower editing costs An History of Videotex Technically at stake : memory size latches 7 Page store 8 coder character effects e generator Serial mode d generator 8 8 Page effects effects Store character generator generator 8 Parallel mode An History of Videotex An History of Videotex German Teletext An History of Videotex Family Tree of Videotex Systems PRESTEL Télétel TÉLIDON CAPTAIN 76 78 79 78 T-CD/06/01 S.100 A.T.T. April 1981 1980 June 1981 Innsbruck Montréal Toronto BildschirmText T-CD/06/01 NAPLPS digital 1984 May 1984 1982 CAPTAIN Montpellier 1983 OSI T.101 1984 Architel Body annexes An History of Videotex from UK TELETEXT to VIEWDATA 1971 : Sam FEDIDA (UK Post Office) invents Videotex First Viewdata : very close to TicTac 1974 : first specifications 1976 : unified specifications ( with Teletext) adopted 1977 : experimental service opened (and presented to CEPT) 1979 : official opening of the public service An History of Videotex Canada : Telidon and the geometric mode . *. (PDI = Picture Description Instructions) * * . * Point Line Arc Rectangle Polygon Incremental Text An History of Videotex A geometric service : telewriting (1979) An History of Videotex An History of Videotex An History of Videotex Japon : Captain and the photographic mode raster scan An History of Videotex PhotoVideotex (1985) An History of Videotex An History of Videotex DRCS : Dynamically Redefinable Character sets Time Base Page ABC Character Store codes Character Screen ROM Character RAM decoder An History of Videotex An History of Videotex An History of Videotex An History of Videotex regional Architecture center PSTN Terminal Service National Providers center centralised regional center PSTN Terminal distributed Packet Access switched data network Point Server PSDN Terminal An History of Videotex The tree structure of Viewdata magazines Page 0 1 2 3 4 5 6 7 8 31 32 33 34 35 36 37 38 An History of Videotex An History of Videotex The first french services • The Velizy experiment (1979) : In a locality in the vicinity of Paris, experimentation of – Electronic news-papers – E-commerce (by mail order companies) – TV-Set with STB • Electronic Directory (1980) – All France – Dedicated terminal (minitel) An History of Videotex The electronic directory in Saint Malo : the early experiment An History of Videotex An History of Videotex The infrared keyboard of the Velizy STB An History of Videotex Teletel Architecture information provider server information provider server Transpac X25 service directory PSPDN (MGS) Videotex access point ( VAP ) PSTN Minitel Minitel An History of Videotex Videotex Access Point main functions Telecommunication functions name address conversion communication link establishment network gateway Charging functions charging of network costs billing and reversing of information prices End user interface functions End user welcome User information An History of Videotex rerouting End user VAP Server A Server B Session N°1 with server A rerouting request towards server B Session establishment with B disconnect Session N°2 with server B An History of Videotex An History of Videotex An History of Videotex Codes de services TÉLÉTEL Codes de services TÉLÉTEL 25000 20000 15000 10000 5000 0 85 86 87 88 89 90 91 92 YEAR An History of Videotex An History of Videotex An History of Videotex Billing Centre Functional model for VOD-like Services Service gateway Access Control Value-Added Service Provider Network Display Management User Unit Content Provider An History of Videotex Network architecture with various terminal access networks Value-added Type 1 Terminal Set-Top-Unit Service Provider AccessContent Network Provider Content Core Type 2 Terminal Set-Top-Unit Provider network Access Network Content Value-added Provider Service Provider An History of Videotex The Services Digital TV Broadcasting of programs within the same multiplex Services without Broadcasting of programs within the same multiplex; connection N VOD some of them may use several video and audio channels (local inter- activity) Broadcast Broadcasting of programs and applications within Multimédia the same multiplex associating audiovisual broadcasted contents with "scripts" locally executed Programs on demand; each of them may have some of VO Services D the above characteristics with connection NOD Short programs (news, ...) which may have some of the News on (distant above characteristics Demand inter- Multimedia Retrieval of multimédia information which may include a activity) information transaction (ticketing, reservation, ...) retrieval An History of Videotex From Télématique to Multimedia Audiovisual Radio télévision N VOD Multimedia VOD NOD SCM Télétel An History of Videotex The multimedia environment An History of Videotex Networks and Services • terrestrial TV • cable • satellite Telco's Digital ISDN ATM Optical fiber Videotelephone ADSL PABX ATM LAN Games Cable Cable (digital) + Télétel accesses + ATM Microcomputer CD based LAN communication ISDN (PC, computers...) PSTN Information Photo retrieval CD TELETEL An History of Videotex From Telematics to Multimedia, in 1994 An History of Videotex .
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