1、BRITISH STANDARD BS EN 61866:1997 IEC 61866: 1997 Audiovisual systems Interactive text transmission system (ITTS) The European Standard EN61866:1997 has the status of a British Standard ICS 33.160.99BSEN 61866:1997 This British Standard, having been prepared under the directionof the Electrotechnica
2、l Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15December1997 BSI 04-1999 ISBN 0 580 28869 2 National foreword This British Standard is the English language version of EN61866:1997. It is identical with IEC61866:1997. The UK participation in its prepa
3、ration was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/3, Equipment and systems in their field of audio, video and audiovisual engineering, which has the responsibility to: aid enquirers to understand the text; present to the r
4、esponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UKinterests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained
5、 on request to its secretary. From1January1997, all IEC publications have the number60000added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from bot
6、h systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European pub
7、lications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users
8、 of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 46 and a back
9、 cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN 61866:1997 BSI 04-1999 i Contents Page National foreword Insid
10、e front cover Foreword 2 Text of EN 61866 5ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61866 October 1997 ICS 33.160.99 Descriptors: Data processing, data transmission, character sets, coded character sets, audio visual, interactive applications, codification, data recording, packet
11、 transmission, data display English version Audiovisual systems Interactive text transmission system (ITTS) (IEC 61866:1997) Systmes audiovisuels Systme de transmission de textes interactifs (ITTS) (CEI 61866:1997) Audiovisuelle Systeme Interaktives Textbertragungssystem (ITTS) (IEC 61866:1997) This
12、 European Standard was approved by CENELEC on1997-10-01. 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 standard without any alteration. Up-to-date lists and bibliographical refer
13、ences 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 any other language made by translation under the responsibility of a CENELEC m
14、ember 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Por
15、tugal, Spain, Sweden, Switzerland and United Kingdom. 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 1997 CENELEC All rights of e
16、xploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61866:1997 EEN 61866:1997 BSI 04-1999 2 Foreword The text of document100C/114/FDIS, future edition1of IEC61866, prepared by SC100C, Audio, video and multimedia subsystems and equipment, of IECTC100, Audio, v
17、ideo and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61866on1997-10-01. The following dates were fixed: Endorsement notice The text of the International Standard IEC61866:1997 was approved by CENELEC as a European Standard without
18、 any modification. In the official version, forAnnex D, Bibliography, the following notes have to be added for the standards indicated: IEC 60958 + A2 NOTEHarmonized as EN60958:1990 (not modified) + A2:1995 (notmodified). latest date by which the EN has to be implemented at national level by publica
19、tion of an identical national standard or by endorsement (dop) 1998-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-07-01EN 61866:1997 BSI 04-1999 3 Contents Page Foreword 2 Introduction 5 1 General 5 1.1 Scope 5 1.2 Definitions and abbreviat
20、ions 5 1.2.1 Definitions 5 1.2.2 Abbreviations 5 1.3 Presentation conventions 6 2 ITTS packet structure 6 2.1 Introductory remark 6 2.2 ITTS packet format 6 2.3 Packet-header field descriptions, bytes 07 9 2.3.1 Packet-header byte 0: language number and application item 9 2.3.2 Packet-header byte 12
21、: packet index 10 2.3.3 Packet-header byte 34 11 2.3.4 Packet-header byte 5 13 2.3.5 Packet-header byte 6: function controls 15 2.3.6 Packet-header byte 7: character set control 16 2.4 Data field description, bytes 847 17 2.4.1 GRAPHICS packet 17 2.4.2 DATA packet 19 3 ITTS data presentation 20 3.1
22、Character repertoire 20 3.2 Serial textline attributes and character controls 26 3.2.1 Serial text line attributes 26 3.2.2 Decoder and character-display alternatives 27 3.3 1-line display functions 28 3.3.1 Validation of 12 characters from 40-character text 29 3.3.2 Character validation 30 3.4 HORI
23、ZONTAL SCROLL function for 12-character displays 30 3.5 CLEAR SCREEN 30 3.6 Colours 30 3.6.1 Default colours 31 3.6.2 Highlighting related colour constraints 31 3.7 Menus 32 3.7.1 Vertical and horizontal menus 32 3.7.2 Function control via commands 32 Page 3.7.3 Interactive commands 33 3.7.4 IC comm
24、and table 33 3.8 Dynamically redefinable character (DRC) packet 37 3.8.1 DRC pattern transmission format, single font mode 37 3.8.2 DRC pattern transmission format, double size font mode 38 3.9 Data integrity 38 Annex A (informative) Application examples for 2-line coding 39 Annex B (informative) Sa
25、mple outline for 12-character validation 41 Annex C (informative) Language supportandcharacter sets 42 Annex D (informative) Bibliography 46 Figure 1 TEXT packet content 7 Figure 2 RUNTIME MENU packet content 7 Figure 3 GRAPHICS TEXT packet content 8 Figure 4 GRAPHICS RUNTIME MENU packet content 8 F
26、igure 5 DATA packet content 9 Figure C.1 Character set selection within a text line Example of mixed graphics and alphanumeric line 43 Figure C.2 Character set selection within a text line Example of mixed alphanumeric, Kanji and Katakana line 44 Figure C.3 Language selection by indexing a maximum o
27、f seven languages out of a total of 256 possible languages 45 Table 1 Latin-based alphanumeric character set 21 Table 2 Extended Latin-based alphanumeric character set 22 Table 3 Mosaic and lined graphics font set 23 Table 4 Japanese font Table 1 24 Table 5 Japanese font Table 2 25 Table 6 Conversio
28、n from ITTS character codes to JIS font numbers 26 Table 7 Serial textline attributes 27 Table 8 Foreground colour serial textline attributes 28 Table 9 Background colour serial textline attributes 28 Table 10 1-line display controls 29 Table 11 Colour look up table 314 blankEN 61866:1997 BSI 04-199
29、9 5 Introduction Distribution and reproduction of digital sound recordings can be accompanied by text associated with the sound track. Such data can be, for instance, album and track titles, lyrics or information about artists and performers. ITTS covers application requirements for pre-recorded med
30、ia, digital broadcasting and remote controls. Several display options are supported for information readout: 21-, 2- and 1-line displays of 40 characters each, as well as a 12-character display window. The user interface consists of displayed text and provision for direct access to information by me
31、ans of related function control keys or a cursor positioned over a menu item and a SELECT function key. Various character sets can be used in the system. Up to40(horizontal) 21 (vertical) alphanumerical characters can be presented on a screen. For other fonts, like Kanji, the number of fonts that ca
32、n be presented on a screen depends on the font size which is defined together with the font table. ITTS uses the Latin-based alphanumeric character set based on ISO8859-1 and the repertoire described in EBUTech.3232. Further, a font set containing graphical elements and font sets providing Japanese
33、fonts are presently defined. NOTEUser-defined 12 horizontal 10 vertical pixel graphics may be included as well. Information may be presented in monochrome or in up to15colours. These colours are defined in a colour look up table (CLUT) and may be redefined from a palette of4096colours. Information c
34、an be accessed without delay if the ITTS decoder provides a cache memory in which the data from the medium is captured before it is needed for display. An index is applied to each transmission packet to serve this and several other functions. 1 General 1.1 Scope The interactive text transmission sys
35、tem (ITTS) provides the mechanism for encoding sound associated data on prerecorded media and for the transport of such data across equipment interfaces. This International Standard defines the higher layers of ITTS, i.e. those system characteristics which are independent of the recording or interco
36、nnection medium. 1.2 Definitions and abbreviations 1.2.1 Definitions For the purpose of this International Standard the following definitions apply: 1.2.1.1 ITTS interactive text transmission system 1.2.1.2 ITTS packet a data structure comprising header information plus either coded text and graphic
37、s or control and presentation commands. ITIS packets have a fixed length of 48 bytes 1.2.2 Abbreviations The following abbreviations are introduced in the main text: AI: application item; IC: interactive command; ICP: interactive command present; TCI: text continuity index; ICI: instruction continui
38、ty index; CDS: category data start; CDE: category data end; CI: command index;EN 61866:1997 6 BSI 04-1999 1.3 Presentation conventions The following conventions are used in this standard to specify binary and hexadecimal numbers. Where a hexadecimal code or binary code occurs in tables the hexadecim
39、al code is followed by a lower case h; for example, the hexadecimal presentation for a byte containing all binary values 1 is written as FFh, the binary code is represented by a string of 1s and 0s. A string of8bits, comprised in one byte, is written in two groups of 4 bits; for example the binary p
40、resentation of a byte containing the binary equivalent of decimal255is written as11111111. Where a hexadecimal code or binary code occurs in running text, the code values as described above are enclosed in double quotes. 2 ITTS packet structure 2.1 Introductory remark Text information arranged in pa
41、ckets according to the ITTS format can be carried by a subchannel along with audio data. ITTS packets have a length of48bytes: an8byte header and a40byte TEXT or DATA string. Details on how ITTS packets are carried in the subchannel of transmission media is given in the following standards: amendmen
42、t 2 to IEC 60908 1) ; amendment 2 to IEC 60958; ETS300401. 2.2 ITTS packet format The48bytes of an ITTS packet are grouped into the The packet content differs according to the application item code in bits 30 of the first packet byte. The following five packet types are defined: TEXT packet; RUNTIME
43、 MENU packet; GRAPHICS TEXT packet; GRAPHICS RUNTIME MENU packet; DATA packet. Figure 1toFigure 5 specify the content lay-out of the packet header for each of these packet types. PI: packet index; MMC: main message channel; SMC: submessage channel; CLUT: colour look up table; DRCS: dynamic redefinab
44、le character set. 1) To be published. packet-header field: bytes 0 7, data field: bytes 8 47.EN 61866:1997 BSI 04-1999 7 Figure 1 TEXT packet content Figure 2 RUNTIME MENU packet contentEN 61866:1997 8 BSI 04-1999 Figure 3 GRAPHICS TEXT packet content Figure 4 GRAPHICS RUNTIME MENU packet contentEN
45、61866:1997 BSI 04-1999 9 2.3 Packet-header field descriptions, bytes 0 7 2.3.1 Packet-header byte 0: language number and application item Bit 7 0 Reserved for future use 1 Default (must be set to 1 to identify the packet format according to this standard) Bit 64 = language number If more than one la
46、nguage is applied, then the main language with code “001” shall be specified by the content provider. Figure 5 DATA packet content 654 000 Language-independent text or one language only 001 Main language, if various languages are recorded 010 * 111 Additional languages NOTEText lines that are identi
47、cal in all language versions need to be recorded only once if the given language number is “000”. It is recommended to apply additional languages in consecutive order. EN 61866:1997 10 BSI 04-1999 Bit 30 = application item Only one packet per message channel or RUNTIME menu segment shall be specifie
48、d as “also for 1-line display”. 2.3.2 Packet-header byte 12: packet index The main applications for the packet indices are to support cache memory management for ITTS program packets; to control text line order when loaded into the display memory; to specify packets, the content of which shall not b
49、e loaded into a cache memory but displayed and/or executed immediately after passing the input filter stages of the decoder; to define the priority of a packet with respect to the cache memory size; to link DATA packet inherent commands with TEXT packet(s); to link DATA packets with horizontal menu text; to support a packet group validity check. The packet index is carried in byte 12 of each packet. Rules related to the packet i
