BS EN 62298-1-2005 Teleweb application - General description《网络电视应用 一般描述》.pdf

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1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN 62298-1:2005 has the status of a British StandardICS 33.170; 35.240.99Tele

2、web application Part 1: General descriptionBRITISH STANDARDBS EN 62298-1:2005BS EN 62298-1:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 17 October 2005 BSI 17 October 2005ISBN 0 580 46511 Xrequest to its secretary.Cross-referencesThe B

3、ritish Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards

4、Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an ins

5、ide front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can

6、be obtained on present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard is the

7、 official English language version of EN 62298-1:2005. It is identical with IEC 62298-1:2005.The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment, which has the responsibility to: aid enquirers to understand the text;

8、EUROPEAN STANDARD EN 62298-1 NORME EUROPENNE EUROPISCHE NORM June 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENE

9、LEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62298-1:2005 E ICS 33.170; 35.240.99 English version Teleweb application Part 1: General description (IEC 62298-1:2005) Application Teleweb Partie 1: Description gnrale (CEI 62298-1:2005

10、) TeleWeb-Anwendung Teil 1: Allgemeine Beschreibung (IEC 62298-1:2005) This European Standard was approved by CENELEC on 2005-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national

11、 standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in an

12、y other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denm

13、ark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 100/922/FDIS, future edition 1 of IEC 62298-

14、1, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62298-1 on 2005-06-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of

15、an identical national standard or by endorsement (dop) 2006-03-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 62298-1:2005 was approved

16、by CENELEC as a European Standard without any modification. _ 2 EN 62298-1:2005 3 CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references .5 3 Terms, definitions and abbreviations 5 3.1 Terms and definitions 5 3.2 Abbreviations 6 4 General description of TeleWeb6 4.1 Aims6 4.2 Overview .7 4.3 OSI s

17、even-layer model 7 5 Documentation structure.7 6 TeleWeb Application profiles 8 6.1 General .8 6.2 Superteletext profile 8 6.3 Hyperteletext profile 10 7 Display model.10 7.1 Display planes.10 7.2 Display priority 13 8 Control model.13 8.1 User control device .13 8.2 Control functions .13 9 Referenc

18、ing14 10 General decoder architecture .14 Bibliography15Annex ZA (normative) Normative references to international publications with their corresponding European publicationsFigure 1 OSI-style seven-layer model for different delivery systems.7 Figure 2 Documentation structure 8 Figure 3 Display plan

19、es and their priority order11 Figure 4 Screen layout example.12 Figure 5 Block diagram of an example of a Superteletext TeleWeb decoder.14 .16EN 62298-1:2005 4 INTRODUCTION TeleWeb delivers World Wide Web-style content to the TV environment, giving the viewer an enhanced television experience. It ca

20、n be seen as the successor to Teletext. TeleWeb is not restricted to the TV environment and can be deployed equally effectively in areas like DAB, DRM, and home automation. This standard gives a general overview of the TeleWeb application. EN 62298-1:2005 5 TELEWEB APPLICATION Part 1: General descri

21、ption 1 Scope This part of IEC 62298 gives a general overview of the TeleWeb application that allows Web-style text and graphics to be broadcast to, and displayed by, suitable decoders. TeleWeb services can be broadcast in a number of different ways, for example, VBI, DVB, DAB, etc., and to a variet

22、y of decoder types, for example, TVs, portable decoders, PCs, etc. These transmission protocols are described separately. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undate

23、d references, the latest edition of the referenced document (including any amendments) applies. IEC 62297 (all parts), Trigger messages for broadcast applications IEC 62298 (all parts), TeleWeb application ETSI EN 300 231, Television systems; Specification of the domestic video Programme Delivery Co

24、ntrol (PDC) system ETSI EN 300 468, Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems ETSI EN 300 707, Electronic Programme Guide (EPG); Protocol for a TV Guide using electronic data transmission ITU-R BT 1379-1:2004, Safe areas of wide-screen 16:9 and stand

25、ard 4:3 aspect ratio productions to achieve a common format during a transition period to wide-screen 16:9 broadcasting 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 button part of the user interfa

26、ce that enables the viewer to select a page or trigger an event, etc. It may not necessarily exist as a physical button on a remote control handset 3.1.2 Independent Data Line (IDL) stand-alone Teletext packet containing both control and application data, which does not form part of a Teletext page.

27、 The packet address is either 30 or 31 EN 62298-1:2005 6 3.1.3 semi-standby standby mode, currently known in the TV world, in which the small-signal part of the set is powered to support acquisition and signal processing. The picture tube, audio power amplifiers and other large-signal parts are not

28、powered. To the user the set appears to be switched off 3.2 Abbreviations DAB Digital Audio Broadcasting DRM Digital Radio Mondiale DSM-CC Digital Storage Media Command and Control DVB Digital Video Broadcasting EPG Electronic Program Guide ETSI European Telecommunication Standard Institute GIF Grap

29、hics Interchange Format HTML Hyper Text Mark-up Language IDL Independent Data Line JPEG Joint Picture Experts Group MPEG Moving Picture Experts Group OSI Open System Interconnection RGB Red Green Blue URL Uniform Resource Locator VBI Vertical Blanking Interval 4 General description of TeleWeb 4.1 Ai

30、ms The aim of TeleWeb is to deliver World Wide Web-style content to the living room TV to give the viewer an enhanced television experience. A TeleWeb service broadcasts data files containing text and high-definition graphics to suitable decoders. The data transmitted can be closely linked to events

31、 within the accompanying TV programmes, or can be more general in nature to emulate a traditional, but higher definition, Superteletext service. It is intended that TV-based decoders be implemented in a cost-effective manner without recourse to the technology normally associated with personal comput

32、ers. In part, this is achieved by limiting the number of different types of multimedia data that can be used within a service. By careful design of the user interface, decoder manufacturers will be able to offer easy-to-use equipment for accessing TeleWeb services without requiring the consumer to b

33、e computer-literate. In addition, they will be able to customize their products to differentiate them from those of their competitors. The encoding and transmission scheme is designed to be as efficient and robust as possible consistent with conveying potentially large data files via a unidirectiona

34、l channel or bi-directional channel with a low or high data rate. For example, TeleWeb data can be broadcast via Teletext packets using existing infrastructures. The TeleWeb data stream can be encoded into independent data packets that can be transmitted with minimal interference to existing Teletex

35、t services. In many instances, it will be possible to recover otherwise wasted Teletext transmission capacity, and the effect on existing services will be negligible. EN 62298-1:2005 7 It is possible to carry multiple services from different service providers on the same television channel. The fast

36、 transmission of services on analogue TV channels where there is no accompanying video component is also possible. Two TeleWeb profiles are defined: a) a first profile for Superteletext; b) a second profile for Interactive applications. Second-profile decoders shall provide backward compatibility wi

37、th Superteletext decoders. 4.2 Overview A database of files is broadcast, some or all of which are captured and stored by a decoder. Certain files may be broadcast repetitively; others may be transmitted only once when they contain real-time updates or are linked to events in the accompanying TV pro

38、gramme. Each file has a set of attributes to define the file name, file type and other parameters as required. One of these is the theme or content description. This allows a decoder to be programmed to receive only specific information or to exclude certain categories. This is useful where the volu

39、me of data transmitted exceeds the storage capacity available in the decoder. On selecting a TeleWeb service, the viewer is first presented with the home page of the service. Navigation to other pages is via embedded links. It is possible that there may be more than one TeleWeb service on a given ch

40、annel. Therefore, each service includes additional information to allow a menu of available services to be presented to the user. The user interface is at the discretion of the decoder manufacturer, as is the provision of “bookmark“ and “history“ browser features. 4.3 OSI seven-layer model Figure 1

41、shows an OSI-style seven-layer model for TeleWeb when broadcast via different delivery systems. Layer 7: Application Superteletext service Layer 6: Presentation HTML, Text, graphics and data files Layer 5: Session File attributes Layer 4: Transport DSM-CC DSM-CC DSM-CC Layer 3: Network IDL IDL DSM-C

42、C Layer 2: Link Teletext MPEG MPEG Layer 1: Physical VBI DVB DVB Delivery methods for radio Delivery methods for IP Figure 1 OSI-style seven-layer model for different delivery systems 5 Documentation structure IEC 62298-1 describes the general principles and application profiles of TeleWeb and outli

43、nes the display and control models on which the other parts are based. Services can be delivered via a variety of methods as described in IEC 62298-2. IEC 62298-3 specifies the TeleWeb Superteletext profile and IEC 62298-4 describes the TeleWeb Hyperteletext profile. A graphical overview of the docu

44、mentation structure is given in Figure 2. IEC 674/05 EN 62298-1:2005 8 TeleWeb applicationSuperteletext profileTeleWeb applicationHyperteletext profileTeleWebapplicationGeneralGeneralTeleWeb documentationstructurePart 1DeliveryprotocolsDeliveryprofilesDelivery methodsPart 2Part 3 Part 4TeleWeb appli

45、cationFigure 2 Documentation structure 6 TeleWeb application profiles 6.1 General The TeleWeb application profiles are twofold as depicted in Figure 2: the basic functionality Superteletext profile specified in IEC 62298-3; the higher functionality Hyperteletext profile specified in IEC 62298-4. The

46、 following subclauses are general requirements of these profiles. 6.2 Superteletext profile 6.2.1 General The Superteletext profile consists of the Superteletext broadcast features with optional return channel features. 6.2.2 Superteletext broadcast features This subclause lists the main features of

47、 the TeleWeb Superteletext profile. The Superteletext profile is fully specified in IEC 62298-3. Fixed content width and height (640 480 pixels). One proportional font, 5 sizes, 4 styles. The style “normal” is mandatory, the styles “bold”, “italics” and “bold and italics” are optional. IEC 675/05 EN

48、 62298-1:2005 9 One fixed font, 5 sizes, 4 styles. The style “normal” is mandatory, the styles “bold”, “italics” and “bold and italics” are optional. Defined fixed-font character cells (height width in pixels). Support for all East and West European Latin-1 based languages. Minimum colour resolution

49、 of 12 bit (RGB = 444), 24 bit recommended (RGB 888). A minimum of 188 colours in a colour palette. Bit-mapped graphics using the GIF and JPEG formats (GIF, Annex A, JPEG1, JPEG2). Dithering to achieve best colour matching (optional). Support for full and partial transparency. Animation using animated GIF and marquee Accentuation using blink (optional). Display of text and graphics over video. The content is authored using TeleWeb HTM