1、BRITISH STANDARD BS EN 61834-5:1998 IEC 61834-5: 1998 Recording Helical-scan digital video cassette recording system using6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) Part 5: The character information system The European Standard EN 61834-5:1998 has the status
2、 of a British Standard ICS 33.160.40BSEN 61834-5:1998 This British Standard, having been prepared under the directionof the Electrotechnical Sector Committee, was publishedunderthe authority ofthe Standards Committee andcomesinto effect on 15December 1998 BSI 06-1999 ISBN 0 580 30868 5 National fore
3、word This British Standard is the English language version of EN61834-5:1998. It is identical with IEC 61834-5:1998. The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/2, Recording, which ha
4、s the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in
5、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, IEC27-1 has been renumbered as IEC 60027-1. For a period of time during the change over
6、 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 normally include an annex which lists normative references to international publications with their corresponding European p
7、ublications. 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 “Find” facility of the BSI Standards Electronic Catalogue. A British
8、Standard does not purport to include all the necessary provisions of a contract. Users 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 co
9、ver, an inside front cover, pages i and ii, theEN title page, pages 2 to 46, an inside back cover and a back 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
10、 since publication Amd. No. Date CommentsBSEN 61834-5:1998 BSI 06-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61834-5 5ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61834-5 October 1998 ICS 33.160.40 Descriptors: Video equipment, digital technics, m
11、agnetoscopes, video recording, sound recording, cassettes for magnetic tapes, magnetic tapes, recording characteristics, data processing, data, organisation of data, character sets English version Recording Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer
12、 use (525-60, 625-50, 1125-60 and 1250-50 systems) Part 5: The character information system (IEC 61834-5:1998) Enregistrement Systme de magntoscope numrique cassette balayage hlicodal utilisant la bande magntique de 6,35 mm, destin au grand public (systmes 525-60, 625-50, 1125-60 et 1250-50) Partie
13、5: Structures des jeux de caractres (CEI 61834-5:1998) Aufzeichnung Videokassettensystem mit digitaler Schrgspuraufzeichnung auf Magnetband 6,35 mm fr den Heimgebrauch (Systeme 525-60, 625-50, 1125-60 und 1250-50) Teil 5: Das Schriftzeichen- Informationssystem (IEC 61834-5:1998) This European Standa
14、rd was approved by CENELEC on 1998-10-01. 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 references concernin
15、g 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 member into its
16、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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Po
17、rtugal, 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 1998 CENELEC All rights of
18、exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61834-5:1998 EEN 61834-5:1998 BSI 06-1999 2 Foreword The text of document100B/167/FDIS, future edition1 ofIEC61834-5, prepared bySC 100B, Recording, ofIEC TC 100, Audio, video and multimedia systems and equ
19、ipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC asEN61834-5 on1998-10-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement n
20、otice The text of the International Standard IEC61834-5:1998 was approved by CENELEC as a European Standard without any modification. latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1999-07-01 latest date by
21、 which the national standards conflicting with the EN have to be withdrawn (dow) 2001-07-01EN 61834-5:1998 BSI 06-1999 3 Contents Page Foreword 2 1 General 5 1.1 Scope 5 1.2 Normative reference 5 1.3 Definitions, symbols and abbreviations 5 2 Data structure of the character information system 5 2.1
22、Topic 6 2.2 Topic unit 6 2.3 Page unit 6 2.4 Topic header, page header 6 2.5 Text unit and text data 6 3 Packs for the character information system 6 3.1 TOPIC/PAGE HEADER pack 6 3.2 TEXT HEADER packs and TEXT packs 6 3.3 Packs for positioning data 7 3.4 TEXT flag 7 4 Full mode 7 4.1 Main topics and
23、 optional topics 7 4.2 Menu topic 8 4.3 TOC topic 8 5 Simple mode 8 6 Presentation 8 6.1 Displaying area 8 6.2 Display mode 9 6.3 Character space 9 6.4 Display format and character size 9 6.5 Active position 9 7 Coding 9 7.1 The structure of the 8-bit code 9 7.2 Control codes 10 7.3 Code extension t
24、echniques 10 7.4 Coding of DRCS data 11 7.5 Coding of DCS data 12 Annex ZA (normative) Normative references to international publications with their corresponding European publications Inside back cover Figure 1 Data structure of the character information system 13 Figure 2 Topic unit and page unit
25、14 Figure 3 Packs concerning text 16 Figure 4 Position data in TOC topic 17 Page Figure 5 Example of TITLE TEXT HEADER pack in MIC 18 Figure 6 Example of a menu topic 19 Figure 7 Example of pre-recorded tape 22 Figure 8 Display image of a TOC 23 Figure 9 Example of TOC topic 24 Figure 10 Example of
26、pre-recorded tape in simple mode 27 Figure 11 Example of users tape in simple mode 28 Figure 12 Unit screen and displaying area 28 Figure 13 Standard density 30 Figure 14 High density 31 Figure 15 Code table 32 Figure 16 Active position control codes 37 Figure 17 Code extension method using escape s
27、equence 38 Figure 18 Data structure of DRCS data on tape 40 Figure 19 LPS = 73h 42 Figure 20 LPS = 78h 42 Figure 21 LPS = 6Bh 42 Figure 22 LPS = 33h 43 Figure 23 LPS = 38h 43 Figure 24 LPS = 31h 44 Figure 25 LPS = 30h 44 Figure 26 LPS = 32h 45 Figure 27 Data structure of DCS data on tape 45 Figure 2
28、8 Example of a character information using DCS data 46 Table 1 Pack header table 15 Table 2 Display modes 16 Table 3 Display formats 28 Table 4 Character size 29 Table 5 C0 control codes except for LS0, LS1, SS2, SS3 33 Table 6 C1 control code 34 Table 7 Designation codes 39 Table 8 Invocation codes
29、 39 Table 9 OPN-change codes 39 Table 10 Final byte for DRCS 41 Table 11 Type of LPS 414 blankEN 61834-5:1998 BSI 06-1999 5 1 General 1.1 Scope This part ofIEC61834 specifies the character information system which is applicable to the whole recording system of the helical-scan digital video cassette
30、 using 6,35mm magnetic tape. This system provides the method of recording characters in many languages and moreover provides easy operation for users. 1.2 Normative reference The following standard contains provisions which, through reference in this text, constitutes provisions of this part ofIEC61
31、834. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard listed below. Members of IEC and I
32、SO maintain registers of currently valid International Standards. ISO/IEC 2022:1994, Information technology Character code structure and extension techniques. 1.3 Definitions, symbols and abbreviations For the purpose of this International Standard, the following definitions or abbreviations apply.
33、2 Data structure of the character information system Character information data are recorded in the optional area of AAUX, VAUX, Subcode and MIC in the form of the pack structure. Figure 1 shows the character information system. Data structure of the full mode: Data structure of the simple mode: DCS
34、: Downloaded character set DJCS: Downloaded Japanese character set DRCS: Dynamically redefinable character set LPS: Logical pixel structure OPN: Option number PD: Pattern data TRM: Transmission mode Topic = topic unit 1 Topic unit = topic header + position data m + page unit n Page unit = page heade
35、r + text unit group = page header + text unit k Text unit = text header + text data where m = 1 for TOC topic, m = 0 for other topics n = 1, 2, 3 k = 1, 2, 3 l = 1, 2, 3 Text unit group = text unit j Text unit = text header + text data where j = 1, 2, 3 EN 61834-5:1998 6 BSI 06-1999 2.1 Topic The fu
36、ll mode consists of many topics which are selected by a producer. Each topic has only one topic unit. 2.2 Topic unit Each kind of topic unit has different contents. Each topic unit except for a TOC topic consists of a topic header and some page units. For the TOC topic, there is position data betwee
37、n the topic header and page unit 1. 2.3 Page unit Each page unit consists of a page header and a text unit group. A text unit group has several text units. There are four display modes per a page which is described in Table 2. Therefore, the maximum amount of character data in a page unit is limited
38、 to the number of characters which can be displayed at one time. 2.4 Topic header, page header For both the topic and page header, the TOPIC/PAGE HEADER pack in the CONTROL group (pack header= 07h) shall be used. The first two bytes in the four-byte pack data of the TOPIC/PAGE HEADER pack are the to
39、pic header part and the latter two bytes are the page header part. In the topic header part, there is a TOPIC TAG. A topic whose TOPIC TAG = 01h is a TOC topic which requires position data. In the page header part, there is a PU No. (page unit number) as shown in Figure 2. For a TOC topic, the PU No
40、. shall be increased one by one from 00h, and from 01h for other topics. The details of the TOPIC/PAGE HEADER pack are explained in part 4. Figure 2a shows a topic unit for a TOC. The first TOPIC/PAGE HEADER pack refers to the topic header. Its TOPIC TAG is 01h and its PU No. is00h. Subsequent data
41、are position data which indicate the start positions of the title, chapter, part and so on which are selected by a producer. The subsequent TOPIC/PAGE HEADER pack is the page header. Its TOPIC TAG is01h and PU No. is01h. The first two bytes in the four-byte pack data of TOPIC/PAGE HEADER packs withi
42、n a topic have the same contents for the benefit of verification. Subsequent data is the text unit group which includes text data to display. Figure 2b shows a topic unit which is not a TOC and does not require a position data. Therefore, the first TOPIC/PAGE HEADER pack consists of the topic header
43、 and the first page header. Its TOPIC TAG is not01h and its PU No. is01h. Figure 2c shows a page unit and a text unit group. A page unit consists of a page header and a text unit group which has several text units. 2.5 Text unit and text data A text unit consists of a text header and text data. For
44、tape, text data is formed by a TEXT HEADER pack and TEXT packs which adopt a fixed length pack structure as shown in Figure 2c. For the MIC, text data includes a TEXT HEADER pack which adopts a variable length pack structure as shown inFigure 3. Text data shall be stored in text units as character c
45、odes. 3 Packs for the character information system Some packs are prepared to provide character information. 3.1 TOPIC/PAGE HEADER pack This is defined in the CONTROL group and the pack header is07h. 3.2 TEXT HEADER packs and TEXT packs There are eight kinds of TEXT HEADER packs and nine kinds of TE
46、XT packs as shown in Figure 3 and Table 1. Each TEXT HEADER pack shall be used with the TEXT pack of the same group, when text data is recorded on tape. Since each group has its own TEXT HEADER pack and TEXT pack, the type of written text data is obvious. For instance, the title text, chapter text a
47、nd part text may exist in the same VAUX optional area in the same video frame for pre-recorded tape. The most significant four bits of the pack header can separate the text data to be displayed from text data cited above. Furthermore, each TEXT HEADER pack has its own TEXT TYPE which consists of fou
48、r bits and defines its text type such as name, memo, station and so on.EN 61834-5:1998 BSI 06-1999 7 The last byte (PC4) of the CONTROL TEXT HEADER pack has two types. For the menu topic, PC4 includes 3 bits for the AREA No. and 5 bits for the TOPIC TAG. The menu topic defines the relationship betwe
49、en a topic and a TOPIC TAG. For other use, PC4 shall be FFh. Unused bytes in a TEXT pack shall be filled with00h which means NUL data as shown inTable 5. The details of TEXT HEADER packs are described in part 4. TEXT TYPE The TEXT TYPE in each TEXT HEADER pack indicates the type of text data as shown in part 4. if the TEXT TYPE is neither “Font” nor “Graphic”, text data is recognized as character codes. The data format of “Font” is described in 7.4
