1、- STD-BSI BS EN b18bb-ENGL 1777 Lb24bb Ubb7Y57 b3L BRITISH STANDARD Audiovisual systems - Interactive text transmission system (ITTS) * m * The European Standard EN 61866 : 1997 has the status of a British Standard ICs 33.160.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
2、BS EN 61866 : 1997 IEC 61866 : 1997 BS EN 61866 : 1997 Amd.No. This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1997 Date Text affected National foreword
3、 This British Standard is the Enghsh language version of EN 61866 : 1997. It is identical with IEC 61866 : 1997. The UK participation in its preparation was entrusted to Technical Committee EPL400, Audio, video and multimedia systems and equipment, to Subcommittee EPWlOOB, Equipment and systems in t
4、heir field of audio, video and audiovisual engineering, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationalA3uropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor r
5、elated international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been
6、 renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normaiiy include an annex which lists normative refer
7、ences to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the
8、Find facility of the BSI standasds Electronic Catalogue. 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, the EN title page, pages 2 to 55, a blank page, an inside back cover a
9、nd a back cover. O BSI 1997 ISBN O 680 28869 2 - STD-BSI BS EN bLBbb-ENGL 1777 Zb24bb7 Obb74bl 29T EUROPEAN 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 ap
10、plications, codification, data recording, packet transmission, data display English version Audiovisual systems Interactive text transmission system (ITTS) (IEC 61 866:1997) Systmes audiovisuels - Systme de transmission de textes interactifs (ITTS) (CE1 61 866: 1997) Audiovisuelle Systeme - Interakt
11、ives Textbertragungssystem (ITS) (IEC 61 866:1997) This European Standard was approved by CENELEC on 1997-1 0-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without an
12、y 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 any other language mad
13、e 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, Denmark, Finland, France, Germany, Greece, Icela
14、nd, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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 S
15、tassart 35, B - 1050 Brussels 1997 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61866:1997 E STD.BS1 BS-EN bLbb-ENGL 1797 SI Lb24bb Obb74b2 lab OTd Page 2 EN 61866 : 1997 Foreword The text of document 1 OOC/114/FDIS, future edi
16、tion 1 of IEC 61 866, prepared by SC 1 OOC, Audio, video and multimedia subsystems and equipment, of 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 61 866 on 1997-1 0-01. The following dates were fixed:
17、- latest date by which the EN has to be implemented at national level by publication 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) 1998-07-01 Endorsement notice The text of the Int
18、ernational Standard IEC 61866:1997 was approved by CENELEC as a European Standard without any modification. In the official version, for annex D, Bibliography, the following notes have to be added for the standards indicated: IEC 60958 + A2 NOTE: Harmonized as EN 60958:1990 (not modified) + A2:1995
19、(not modified). STDmBSI BS EN bLBDb-ENGL 1997 1624bb9 Obb74b3 b2 * * m Page 3 EN 61866 : 1997 CONTENTS INTRODUCTION . Clause 1 General . 1.1 Scope . 1.2 Definitions and abbreviations . 1.2.1 Definitions . 1.2.2 Abbreviations 1.3 Presentation conventions . 2 ITTS packet structure . 2.1 Introductory r
20、emark 2.3 2.2 IlTS packet format Packet-header field descriptions. bytes O - 7 Packet-header byte O: language number and application item . Packet-header byte 1-2: packet index 2.3.3 Packet-header byte 3-4 . 2.3.4 Packet-header byte 5 2.3.5 Packet-header byte 6: function controls 2.3.6 Packet-header
21、 byte 7: character set control . Data field description. bytes 8-47 . 2.4.1 GRAPHICS packet . 2.4.2 DATA packet . 2.3.1 2.3.2 2.4 3 ITJS data presentation . 3.1 Character repertoire . 3.2 Serial textline attributes and character controls . 3.2.1 Serial text line attributes 3.2.2 Decoder and characte
22、r-display alternatives 1 -line display functions . 3.3.1 Validation of 12 characters from 4character text . . 3.3.2 Character validation 3.4 HORIZONTAL SCROLL function for 12-character displays 3.5 CLEAR SCREEN . 3.6 Colours . 3.6.1 Default colours . 1 3.6.2 Highlighting related colour constraints 3
23、.7.1 Vertical and horizontal menus . 3.7.2 Function control via commands . 3.7.3 Interactive commands . 3.7.4 IC command table . 3.8 Dynamically redefinable character (DRC) packet 3.8.1 DRC pattem transmission format. single font mode . 3.8.2 DRC pattern transmission format. double size font mode 3.
24、9 Data integrity 3.3 3.7 Menus . Page 5 6 6 6 6 6 7 7 7 7 10 10 11 12 15 17 20 21 21 23 25 25 31 31 32 33 35 35 35 36 36 37 37 37 30 39 39 39 45 45 46 46 8 BSI 1997 STD-BSI BS EN bL8bb-ENGL 1997 lb24bb7 Obb74b4 TT9 CBB Page 4 EN 61866 : 1997 Tables 1 2 3 4 5 6 7 8 9 10 11 Latin-based alphanumeric ch
25、aracter set Extended Latin-based alphanumeric character set . Mosaic and lined graphics font set Japanese font table 1 Japanese font table 2 Conversion from IlTS character codes to JIS font numbers Serial textline attributes Foreground colour serial textline attributes Background colour serial textl
26、ine attributes . Colour look up table . 1 -line display controls Figures 2 3 4 1 TEXT packet content . RUNTIME MENU packet content GRAPHICS RUNTIME MENU packet content 5 DATA packet content . GRAPHICS TEXT packet content . C.l Character set selection within a ted line . Example of mixed graphics and
27、 C.2 Character set selection within a text line . Example of mixed alphanumeric. Kanji C.3 Language selection by indexing a maximum of seven languages out of a total alphanumeric line . and Katakana line of 256 possible languages . Annexes A (informative) Application examples for 2-line coding . B (
28、informative) Sample outline for 12-character validation . C (informative) Language support and character sets D (informative) Bibliography Page 26 27 28 29 30 31 32 33 33 34 37 8 8 9 9 10 53 54 54 47 50 52 55 Q BSI 1997 * u) * Page 5 EN 61866 : 1997 INTRODUCTION Distribution and reproduction of digi
29、tal 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 media, digital broadcasting and remote controls. Several
30、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 means of related function control keys or a cursor pos
31、itioned over a menu item and a SELECT function key. Various character sets can be used in the system. Up to 40 (horizontal) x 21 (vertical) alphanumerical characters can be presented on a screen. For other fonts, like Kanji, the number of fonts that can be presented on a screen depends on the font s
32、ize which is defined together with the font table. ITTS uses the Latin-based alphanumeric character set based on IS0 8859-1 and the repertoire described in EBU Tech. 3232. Further, a font set containing graphical elements and font sets providing Japanese fonts are presently defined. NOTE - User-defi
33、ned 12 horizontal x 1 O vertical pixel graphics may be included as well. Information may be presented in monochrome or in up to 15 colours. These colours are defined in a colour look up table (CLUT) and may be redefined from a palette of 4 096 colours. Information can be accessed without delay if th
34、e 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. STD-BSI BS EN bZBbb-ENGL 1997 Lb24bb9 Obb74bb 871 i8311 Page 6 EN 61866 : 1997 AUDIOVISUAL
35、SYSTEMS - INTERACTIVE TEXT TRANSMISSION SYSTEM (ITTS) 1 General 1.1 Scope The interactive text transmission sys.jm (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
36、 the higher layers of ITTS, .e. those system characteristics which are independent of the recording or interconnection 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 transmissi
37、on system 1.2.1.2 ITTS packet: A data structure comprising header information plus either coded text and graphics or control and presentation commands. ITTS packets have a fixed length of 48 bytes. 1.2.2 Abbreviations The following abbreviations are introduced in the main text: AI: IC: ICP: TCI: ICI
38、: CDS: CDE: CI: PI: MMC: SMC: CLUT: DRCS: application item; interactive command; interactive command present; text continuity index; instruction continuity index: category data start: category data end: command index; packet index; main message channel; su bmessag e chan ne1 ; colour look up table;
39、dynamic redefinable character set. Page 7 EN 61866 : 1997 1.3 Presentation conventions The following conventions are used in this standard to specify binary and hexadecimal num bers. Where a hexadecimal code or binary code occurs in tables - the hexadecimal code is followed by a lower case h; for ex
40、ample, 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 Os. A string of 8 bits, comprised in one byte, is written in two groups of 4 bits; for example the binary presentation of a byte containing the bina
41、ry equivalent of decimal 255 is written as 11 11 11 11. 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 packets according to the ITTS format
42、can be carried by a subchannel along with audio data. ITTS packets have a length of 48 bytes: an 8 byte header and a 40 byte TEXT or DATA string. Details on how ITTS packets are carried in the subchannel of transmission media is given in the following standards: - amendment 2 to IEC 609081); - amend
43、ment 2 to IEC 60958; - ETS300401. 2.2 ITTS packet format The 48 bytes of an ITTS packet are grouped into the - packet-header field: bytes O - 7, - data field: bytes 8 - 47. The packet content differs according to the application item code in bits 3-0 of the first packet byte. The following five pack
44、et types are defined: - TEXT packet; - RUNTIME MENU packet; - GRAPHICS TEXT packet; - GRAPHICS RUNTIME MENU packet: - DATA packet. To be published. STD-BSI BS EN blAbb-ENGL 2777 Lb2qbb bb74bA b44 iBg Byte o 1 2 Page 8 EN 61866 : 1997 i LANGUAGE NUMBER APPLICATION ITEM e PACKET INDEX MSByte PACKET IN
45、DEX LSByte Figures 1 to 5 specify the content layout of the packet header for each of these packet types. 3 4 5 6 7 MAIN MESSAGE CHANNEL CODE Packet SUBMESSAGE CHANNEL CODE header ,i 21-LINE CODE 2-LINE CODE ICP SCROLL ATTRIBUTE TC I CDS CDE CHARACTERSETS 0 0 Byte o 1 2 3 4 5 6 7 8 CHARACTER CODE 2
46、- 39 I 1 LANGUAGE NUMBER APPLICATION ITEM PACKET INDEX MSByte PACKET INDEX LSByte RUNTIME MENU SEGMENT NUMBER (BCD) RUNTIME MENU SUBSEGMENT NUMBER (BCD) Packet header .i 21-LINE CODE 2-LINE CODE ICP SCROLL ATTRIBUTE TCI CDS CDE CHARACTERSETS 0 0 1 CHARACTER CODE 1 -_-_- Figure 1 -TEXT packet content
47、 CHARACTER CODE 2 - 39 I Figure 2 - RUNTIME MENU packet Content STD-BSI BS EN blbb-ENGL 1777 Lb24bb7 Obb74b7 5O Byte o 1 2 Page 9 EN 61866 : 1997 LANGUAGE NUMBER APPLICATION ITEM 1 PACKET INDEX MSByte PACKET INDEX MSByte 3 4 5 6 7 8 47 MAIN MESSAGE CHANNEL CODE SUBMESSAGE CHANNEL CODE 21-LINE CODE 2
48、-LINE CODE ICP SCROLL ATTRIBUTE TC I CDS CDE MODE HORIZONTAL POSITION GRAPHICS PIXEL CODE 1 -_-_-_- GRAPHICS PIXEL CODE 2 - 39 GRAPHICS PIXEL CODE 40 Figure 3 - GRAPHICS TEXT packet content Byte o 1 2 i LANGUAGE NUMBER APPLICATION ITEM PACKET INDEX MSByte PACKET INDEX LSByte 31 RUNTIME MENU SEGMENT
49、NUMBER (BCD) I 4 RUNTIME MENU SUBSEGMENT NUMBER (BCD) 2-LINE CODE 5 21-LINE CODE 6 ICP SCROLL ATTRIBUTE TC I COS CDE 7 MODE HORIZONTAL POSITION Packet header i i One graphics area Packet 1 header GRAPHICS PIXEL CODE 2 - 39 I 47 GRAPHICS PIXEL CODE 40 Figure 4 - GRAPHICS RUNTIME MENU packet Content Page 10 EN 61866 : 1997 Byte o 1 2 3 Bit MS8 LSB 7.6.5.4.3.2.1.0 1 LANGUAGE NUMBER APPLICATION ITEM PACKET INDEX MSByte PACKET INDEX LSByte MAIN MESSAGE CHANNEL CODE 41 SUBMESSAGE CH
