IEC 61834-5:1998

Recording - Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) - Part 5: The character information system

Specifies the character information systems which is applicable to the whole recording system for helical-scan digital video cassettes using 6,35 mm magnetic tape. Provides the method of recording characters in many languages and provides easy operation for users.

Enregistrement - Système de magnétoscope numérique à cassette à balayage hélicoïdal utilisant la bande magnétique de 6,35 mm destiné au grand public (systèmes 525-60, 625-50, 1125-60 et 1250-50) - Partie 5: Système à caractères d'information

Spécifie le système à caractères d'information applicable à l'ensemble du système d'enregistrement des magnétoscopes numériques à cassette à balayage hélicoïdal sur bande magnétique de 6,35 mm. Donne la méthode d'enregistrement des caractères en plusieurs langues et facilite l'emploi par les utilisateurs.

General Information

• Status: Published
• Publication Date: 11-Aug-1998
• ICS: 33.160.40 - Video systems
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Drafting Committee: WG 3 - TC 100/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 30-Sep-1998
• Completion Date: 12-Aug-1998

Standards Content (Sample)

INTERNATIONAL
IEC
STANDARD
61834-5
First edition
1998-08
Recording –
Helical-scan digital video cassette
recording system using 6,35 mm magnetic tape
for consumer use (525-60, 625-50, 1125-60
and 1250-50 systems) –
Part 5:
The character information system
Enregistrement –
Système d’enregistrement grand public à vidéocassette
à défilement hélicoïdal pour bande magnétique de 6,35 mm
(systèmes 525-60, 625-50, 1125-60 et 1250-50) –
Partie 5:
Structures des jeux de caractères
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60 000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are
available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base
publication incorporating amendments 1 and 2.
Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken by
the technical committee which has prepared this publication, as well as the list of
publications issued, is to be found at the following IEC sources:
• IEC web site*
• Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International Electro-
technical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60 617: Graphical symbols
for diagrams.
* See web site address on title page.

INTERNATIONAL
IEC
STANDARD
61834-5
First edition
1998-08
Recording –
Helical-scan digital video cassette
recording system using 6,35 mm magnetic tape
for consumer use (525-60, 625-50, 1125-60
and 1250-50 systems) –
Part 5:
The character information system
Enregistrement –
Système d’enregistrement grand public à vidéocassette
à défilement hélicoïdal pour bande magnétique de 6,35 mm
(systèmes 525-60, 625-50, 1125-60 et 1250-50) –
Partie 5:
Structures des jeux de caractères
 IEC 1998  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
X
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61834-5  IEC:1998(E)
CONTENTS
Page
FOREWORD . 4
Clause
1 General. 6
1.1 Scope . 6
1.2 Normative reference. 6
1.3 Definitions, symbols and abbreviations . 6
2 Data structure of the character information system . 7
2.1 Topic . 7
2.2 Topic unit. 7
2.3 Page unit . 7
2.4 Topic header, page header. 7
2.5 Text unit and text data. 8
3 Packs for the character information system . 8
3.1 TOPIC/PAGE HEADER pack . 8
3.2 TEXT HEADER packs and TEXT packs. 8
3.3 Packs for positioning data . 9
3.4 TEXT flag . 10
4 Full mode. 10
4.1 Main topics and optional topics. 10
4.2 Menu topic . 11
4.3 TOC topic . 11
5 Simple mode . 11
6 Presentation. 11
6.1 Displaying area . 11
6.2 Display mode . 12
6.3 Character space. 12
6.4 Display format and character size. 12
6.5 Active position. 13
7 Coding . 13
7.1 The structure of the 8-bit code. 13
7.2 Control codes. 13
7.3 Code extension techniques . 14
7.4 Coding of DRCS data . 15
7.5 Coding of DCS data . 16

61834-5  IEC:1998(E) – 3 –
Tables
1 Pack header table . 20
2 Display modes. 21
3 Display formats . 34
4 Character size . 34
5 C0 control codes except for LS0, LS1, SS2, SS3 . 38
6 C1 control code . 39
7 Designation codes . 44
8 Invocaton codes . 44
9 OPN-change codes . 44
10 Final byte for DRCS. 46
11 Type of LPS . 46
Figures
1 Data structure of the character information system . 18
2 Topic unit and page unit . 19
3 Packs concerning text . 21
4 Position data in TOC topic . 22
5 Example of TITLE TEXT HEADER pack in MIC. 23
6 Example of a menu topic . 24
7 Example of pre-recorded tape. 27
8 Display image of a TOC. 28
9 Example of TOC topic. 29
10 Example of pre-recorded tape in simple mode . 32
11 Example of user's tape in simple mode . 33
12 Unit screen and displaying area . 33
13 Standard density. 35
14 High density . 36
15 Code table. 37
16 Active position control codes . 42
17 Code extension method using escape sequence . 43
18 Data structure of DRCS data on tape . 45
19 LPS = 73h . 47
20 LPS = 78h . 47
21 LPS = 6Bh. 47
22 LPS = 33h . 47
23 LPS = 38h . 47
24 LPS = 31h . 48
25 LPS = 30h . 48
26 LPS = 32h . 48
27 Data structure of DCS data on tape . 49
28 Example of a character information using DCS data. 50

– 4 – 61834-5  IEC:1998(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
RECORDING – HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING
SYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE
(525-60, 625-50, 1125-60 AND 1250-50 SYSTEMS) –
Part 5: The character information system
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61834-5 has been prepared by subcommittee 100B: Audio, video
and multimedia information storage systems, of IEC technical committee 100: Audio, video and
multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100B/167/FDIS 100B/179/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

61834-5  IEC:1998(E) – 5 –
IEC 61834 consists of the following parts:
– Part 1: General specifications;
– Part 2: SD format for 525-60 and 625-50 systems;
– Part 3: HD format for 1125-60 and 1250-50 systems;
– Part 4: The pack header table and the contents;
– Part 5: The character information system.
This document is part 5 and describes the character information system which is applicable to
the whole recording system of the helical-scan digital video cassette.
Part 1 describes the common specifications for the helical-scan digital video cassette recording
system using 6,35 mm magnetic tape.
Part 2 describes the specifications for 525-60 and 625-50 systems which are not included in
part 1.
Part 3 describes the specifications for 1125-60 and 1250-50 systems which are not included in
part 1 and part 2.
Part 4 describes the pack header table and the contents of packs which are applicable to the
whole recording system of the helical-scan digital video cassette.
For manufacturing SD digital video cassette recording systems part 1, part 2, part 4 and part 5
are referred to.
For manufacturing HD digital video cassette recording systems part 1, part 2, part 3, part 4 and
part 5 are referred to.
A bilingual version of this standard may be issued at a later date.

– 6 – 61834-5  IEC:1998(E)
RECORDING – HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING
SYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE
(525-60, 625-50, 1125-60 AND 1250-50 SYSTEMS) –
Part 5: The character information system
1 General
1.1 Scope
This part of IEC 61834 specifies the character information system which is applicable to the
whole recording system of the helical-scan digital video cassette using 6,35 mm 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 of IEC 61834. 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 ISO 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.
DCS: 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
61834-5  IEC:1998(E) – 7 –
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:
Topic = topic unit 1
Topic unit = topic header + position data × m + page unit × n
Page unit = page header + 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.
I = 1, 2, 3.
Data structure of the simple mode:
Text unit group = text unit × j
Text unit = text header + text data
where
j = 1, 2, 3.
2.1 Topic
The full 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 between 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 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 topic header part and the latter two bytes are the page
header part.
– 8 – 61834-5  IEC:1998(E)
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. 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. is 00h. Subsequent data 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 is 01h and
PU No. is 01h. The first two bytes in the four-byte pack data of TOPIC/PAGE HEADER packs
within 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 and the first page
header. Its TOPIC TAG is not 01h and its PU No. is 01h.
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 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 in figure 3.
Text data shall be stored in text units as character codes.
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 is 07h.
3.2 TEXT HEADER packs and TEXT packs
There are eight kinds of TEXT HEADER packs and nine kinds of TEXT 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 and 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 four bits
and defines its text type such as name, memo, station and so on.

61834-5  IEC:1998(E) – 9 –
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 between a topic and a TOPIC TAG. For other use, PC4
shall be FFh.
Unused bytes in a TEXT pack shall be filled with 00h which means NUL data as shown in
table 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 and 7.5. The data format of "Graphic" is to be
defined.
TEXT CODE and OPN
The TEXT CODE in each TEXT HEADER pack determines the character set. The OPN in each
TEXT HEADER pack is the same as the option number of UK teletext and is valid for TEXT
CODE = 52h~5Dh or 68h~70h which are the same character sets as that of the UK teletext
(EBU SPB492 – December 1992). The OPN together with the TEXT CODE, define the
language-specific characters. When a TEXT CODE is not 52h~5Dh or 68h~70h, OPN shall
be 111b.
More details of TEXT CODEs and OPN are described in the CONTROL TEXT HEADER pack in
part 4.
3.3 Packs for positioning data
There are several packs for positioning data as shown in table 1. Each shaded pack whose
lower pack header is 0101b, 1011b or 1111b has its own absolute track number. For instance,
CHAPTER START pack has the ABSOLUTE TRACK No. of its chapter start position.
When certain applications want to display the start position using time data such as hours,
minutes, seconds and frames, other shaded packs whose lower pack header is 0100b, 1010b
or 1110b shall be used with its positioning packs which include the ABSOLUTE TRACK No. In
this case, the positioning pack including the ABSOLUTE TRACK No. shall be recoded first.
PR START POINT packs are used in MIC only and do not concern the character information
system.
Position data in TOC topic of the full mode
The positioning data for title, chapter, part and programme consist of the START pack and the
END pack of the same group. It is not permitted to record a START pack or an END pack only
and record each pair of positioning packs separately in a TOC topic. Figure 4 shows an
example of the position data in a TOC topic of the full mode. An example of the recording order
of each positioning pack is shown in figure 4.

– 10 – 61834-5  IEC:1998(E)
TITLE START pack
TITLE START pack is used to find the real start point of a title. For pre-recorded tape, there
may exist advertising film or a colour-bar test chart to adjust the monitor TV's signal level,
therefore the absolute track number of the real start point of a title may not be 0. If a TITLE
START pack is recorded in the TOC topic, users will be able to skip this area easily and see
the title directly. For user's tape, it is not necessary to record the TITLE START pack because
the first recording always starts from absolute track number = 0.
3.4 TEXT flag
This flag is included in TAG, TITLE START, CHAPTER START, PART START, PROGRAMME
START, AAUX START, VAUX START, CAMERA PRESET and TIMER ACT DATE packs and
indicates whether text information concerning the pack exists in the optional area where the
pack is recorded or not.
For MIC, it is possible to record text information about a title without recording the TITLE
START pack. Figure 5 shows an example where a TITLE TEXT HEADER pack exists with no
reference to the TEXT flag.
4 Full mode
4.1 Main topics and optional topics
Main topics
Main topics consist of a menu topic and a TOC (table of contents) topic. The TOPIC TAG
number is "0" for the menu and "1" for the TOC. The menu topic is used to define the TOPIC
TAG numbers of all optional topics and to display the contents of each topic. The TOC topic is
used to display the table of contents and to choose a programme. These two main topics shall
be recorded in the full mode.
Optional topics
Optional topics are selected by a producer. The TOPIC TAG number of optional topics shall be
assigned from 2 up to 1Fh.
TEXT TYPE
The TEXT TYPE in the TEXT HEADER pack shall be Fh which is indicative of no information,
when text data is neither "Font" nor "Graphic". Since the menu can indicate what kind of text
data are recorded, there is no need to set the TEXT TYPE explicitly.
Other packs
The full mode may use any or all optional areas of AAUX, VAUX and Subcode. Any other packs
which are not concerned with character information may be recorded in the optional areas with
packs for the full mode.
61834-5  IEC:1998(E) – 11 –
4.2 Menu topic
The menu topic is the most important part of the full mode. First is the definition of the
relationship between each topic and TOPIC TAG in the TOPIC/PAGE HEADER pack. Second
is the definition of the recorded area of each topic in the CONTROL TEXT HEADER pack.
Third is the presentation of all topics in the cassette tape. Fourth is the selection of a language
which a user can understand. The last is the selection of a topic which a user wants to see.
When a user wants to see the character information, the menu which is written in the main
language shall be displayed first. If a user cannot understand the language, the VCR should
display the next language. Selecting a topic means that the user understands the language.
Figure 6 shows an example of a menu topic data in English, Japanese and German.
4.3 TOC topic
Figure 7 shows an example of a pre-recorded tape. In this case, a colour-bar test chart is
recorded before the real start point of the title whose absolute track number is 87103.
A display image in the high-density mode of the TOC is shown in figure 8. High-density mode is
described in 6.4.
Character data concerned with the TOC topic shall be placed in the same order as the position
data. As shown in figure 7, the end point of a part may not correspond with the start point of the
next part. If advertising film exists between chapters, a similar situation can arise. Therefore, it
is necessary to record a pair of position data which consist of a START pack and an END pack.
Figure 9 shows the actual TOC topic data of figure 7 and figure 8. In this example, position
data have packs which are only concerned with absolute track number.
5 Simple mode
The upper layer of the simple mode is a text unit group as shown in figure 1. A text unit group
shall be recorded without separation in each optional area of tape within a video frame and the
optional area of MIC. Figure 10 shows an example of pre-recorded tape. In this case, the text
unit group of AAUX consists of a memo about AAUX in Japanese and English and that of
VAUX consists of the title name and an outline of the title in Japanese and English. The
contents of the text unit can be understood by TEXT TYPE in the TEXT HEADER pack.
Figure 11 shows an example of the user's tape which includes five items.
The difference between the full mode and the simple mode is that the full mode has a menu, a
TOC and a display format, but the simple mode has no information corresponding to them. If
there is no menu, users cannot know what kind of text data are recorded not whether they even
exist in the simple mode. The way of displaying characters depends on each digital VCR in the
simple mode.
6 Presentation
6.1 Displaying area
In the full mode, the displaying area to present the character information is defined by the unit
screen. The unit screen is assumed to be the physical displaying area as shown in figure 12,
and the coordinate is represented as (X, Y), where X is the abscissa, and Y is the ordinate.
Both values of X and Y are changed from "0" to "1". The size of the unit screen is flexible, but
the whole displaying area shall be displayed. In the simple mode, displaying area is not
standardized.
– 12 – 61834-5  IEC:1998(E)
6.2 Display mode
In the full mode, there are three kinds of display mode: no scroll mode, vertical scroll mode and
horizontal scroll mode. These are selected by the SCRL and HV flag in the TOPIC/PAGE
HEADER pack as described in table 2. It is not necessary for all consumer digital VCRs which
can display the character information to answer the vertical and horizontal scroll modes.
The display area for no scroll mode and vertical scroll mode is shown in figure 12. In horizontal
scroll mode, the displaying area is only the bottom row. There are several control codes which
cannot be used in each mode. Details are described in 7.2.
In the simple mode, the display mode is not standardized.
Vertical scroll mode
The first character commences at the primary position of the display area. When the display
area is full of characters and more characters need to be displayed, the vertical scroll occurs.
When the last character is displayed, the scrolling is stopped. If consecutive page units are
written in the vertical scroll mode, there will be no interval lines between two page units.
Horizontal scroll mode
The first character commences at the edge, which is on the opposite side to the primary
position of the display area of the bottom row. When the bottom row is full of characters and
more characters are to be displayed, the horizontal scroll occurs. When the last character is
displayed, the scrolling is stopped. If consecutive page units are written in the horizontal scroll
mode, there will be no interval character between two page units.
6.3 Character space
The character space is the rectangular area in which one character is displayed. A character is
made up from a number of pixels. The size of the character space shall be determined by
display format and character size. The reference point for displaying is the top left corner of the
character space. The character space is expressed in fractional ratios to the unit screen.
6.4 Display format and character size
Table 3 shows the display format. There are two types of display density. One is standard
density, the other is high density. These display areas are expressed in fractional ratios of the
unit screen.
The standard density is suitable for displaying ideographic characters such as Chinese
characters whose codes consist of two bytes. The high density is suitable for alphanumeric
characters whose code consists of one byte. Because ideographic characters are normally
more complex than alphanumeric characters, they can be displayed in only the standard
character size of the standard density.
There are five character sizes for the standard density and four character sizes for the high
density. These character sizes are determined on the basis of the unit screen. In the high
density mode, half width characters are not available. The details are shown in table 4.

61834-5  IEC:1998(E) – 13 –
6.5 Active position
The active position is the character space where the next character will be displayed. After one
character is displayed, the active position moves forward automatically by one character space.
If the active position moves beyond the edge of the display area, the active position shall be
moved at the opposite edge of the displaying area in the next row.
7 Coding
This character information system adopts an 8-bit coded system and code extension
techniques which basically conform to ISO/IEC 2022. Actual character set tables are described
in CONTROL TEXT HEADER pack (pack header = 08h).
7.1 The structure of the 8-bit code
The 8-bit coded table is divided into four areas as shown in figure 15.
C0 (control-set 0) and C1 (control-set 1) are the areas for control codes. GL (graphic-set left)
and GR (graphic-set right) are the areas for graphic character codes. Coding and decoding
shall be carried out using this code table.
7.2 Control codes
Control codes are distributed to C0, C1 and GL.
Control codes in C0 area
C0 has 32 control codes with 14 codes already defined as shown in figure 15. The main
purpose of C0 control codes are screen controls and code extensions which are explained in
table 5. Figure 16 shows the actions of each code for the active position control.
LS0, LS1, SS2, SS3 are described in 7.3 and table 8.
Control codes in C1 area
C1 has 32 control codes with 21 codes already defined as shown in figure 15. The main
purpose of C1 control codes are colour controls and character size changes which are
explained in table 6.
POL, FLC, CDC, RPC, STL, SPL, HLC and CSI are additional functions. These are not
necessary for all consumer digital VCRs, which can display the character information to answer
these additional functions.
Control codes in GL area
The 20h code in the GL area is basically a SP (space) code which fills the character space with
the designated background colour. The 7Fh code in the GL area is basically a DEL (delete)
code which fills the character space with the designated foreground colour.
Both 20h and 7Fh codes are sometimes defined for other characters.

– 14 – 61834-5  IEC:1998(E)
Restrictions for using control codes
There are several control codes which shall not be used in certain display modes.
For the horizontal scroll mode: APB, APF, APD, APU, APR, PAPF, APS, SZX 41h, SZX 45h,
FLC, CDC
For the vertical scroll mode: APB, APS, SZX 41h, SZX 45h, FLC, CDC
For the simple mode: APB, APF, APD, APU, APR, PAPF, APS, SZX, RPC
7.3 Code extension techniques
Code extension method using escape sequence
Certain languages possess many kinds of characters. Therefore, it is necessary for such
languages to extend the character codes within the 8-bit coded table. Figure 17 shows the
code extension method which sets the required character sets to GL or GR areas. To
designate or invoke character sets, escape sequences are used. Table 7 shows the
designation codes and table 8 shows the invocation codes. Final bytes are the same as TEXT
CODE in TEXT HEADER pack.
In table 7, the codes concerning DRCS (dynamically redefinable character sets) are explained
in 7.4. In table 8, LS0, LS1, SS2 and SS3 are already defined in the C0 area of figure 15. Other
symbols adopt the escape sequence. Locking shift means that a character set is invoked to the
character code table until other locking shift is done. Single shift is described later.
OPN-change codes
Some character information may use other languages for only one word. For instance, a
person's name may be required to be written in Japanese in English sentences. Changing the
OPN in TEXT HEADER pack is the normal technique. But it needs one pack more than for a
new TEXT HEADER pack. For the benefit of saving bytes and time, OPN-change codes whose
final byte is from 30h to 3Fh are prepared. Table 9 shows the escape sequences of the OPN-
change codes.
Temporary change of one character
Certain character information may use other languages for only one character. For instance, in
English sentences, a person's name may include umlaut characters. SS2, SS3 codes are
prepared for this purpose as shown in figure 17. In table 8, single shift means that only one
character which is following this code is invoked to the GL area temporarily. This setting is
invalid after using this code and one following character code. The next character code is
based on the original character code table which is used before setting SS2 or SS3 codes.
Automatic setting
TEXT CODEs in TEXT HEADER pack set some character sets automatically to G0, G1, G2,
G3, GL and GR areas.
61834-5  IEC:1998(E) – 15 –
For example, TEXT CODE = 5Fh sets Japanese character sets automatically as below.
G0: Japanese two-byte set (TEXT CODE = 4Bh)
G1: Japanese version roman set (TEXT CODE = 4Ah)
G2: Hiragana set (TEXT CODE = 4Ch)
G3: Katakana set (TEXT CODE = 4Dh)
GL: Japanese two-byte set (TEXT CODE = 4Bh)
GR: Hiragana set (TEXT CODE = 4Ch)
This means that the character information starts to use Japanese two-byte set and Hiragana
set.
Details are described in CONTROL TEXT HEADER pack in part 4.
Code extension method using direct load
For a two-byte coded character set, such as a Japanese two-byte set and a Korean two-byte
set, the DCS (downloaded character set) method is prepared. DCS data is loaded to the
character coded table directly, not using the escape sequence. More details are described
in 7.5.
7.4 Coding of DRCS data
DRCS data are stored in a text unit whose TEXT TYPE in TEXT HEADER pack is equal to 0Ch
for one-byte coded font or 0Dh for the two-byte coded font and consist of TRM (transmission
mode), LPS (logical pixel structure), CC1 (character code 1), CC2 (character code 2) and PDs
(pattern data). It is not necessary for all consumer digital VCRs which can display the character
information to answer the DRCS. Table 10 shows the final byte for DRCS. There are 16 sets
for DRCS available. DRCS set number 0 is used for the two-byte coded character set and
others are used for one-byte coded character set.
For using the DRCS, the following sequence shall be used:
a) Store the required DRCS data using some text units.
b) Store the designation code in table 7.
c) Store the invocation code in table 8.
d) Use the DRCS.
The data structure is shown in figure 18. In this case, OPN and TEXT CODE in TEXT HEADER
pack are all "1" which is indicative of no information. One DRCS data shall be stored in one
text unit. For three DRCS data, they need three text units.
TRM (transmission mode)
00h: Nothing done to other DRCS sets.
01h: The data of all DRCS sets shall be cleared before defining DRCS pattern data.
02h: The data of the DRCS set which is going to be redefined shall be cleared before
setting the new DRCS pattern data.
FFh: No information.
Others: Reserved.
– 16 – 61834-5  IEC:1998(E)
LPS (logical pixel structure)
A logical pixel is an imaginary dot which defines the pattern data. Therefore, the logical pixel
structure does not always correspond to the actual displayed dotted pattern. It depends on the
displaying capability of each consumer digital VCR. For instance, a logical pixel may be
displayed by 1, 2 or 2 × 2 pixels or displayed using decimation.
There are two types of LPS as shown in table 11. Type 0 is mainly considered for the 525-60
system. Actually 73h, 78h and 6Bh of LPS have contents in conformity with Japanese teletext.
Type 1 is mainly considered for the 625-50 system and its contents are basically in conformity
with the UK teletext.
CC1 (character code 1)
For one-byte coded DRCS, CC1 designates the DRCS set number from 1 to 15 as shown in
table 10. For two-byte coded DRCS, CC1 designates the first byte of the character code and
the DRCS set number is 0 implicitly.
CC2 (character code 2)
For one-byte coded DRCS, CC2 designates the character code from 20h to 7Fh. For two-byte
coded DRCS, CC2 designates the second byte of the character code.
PD (pattern data)
For type 0, eight logical pixels of a character are loaded from each PD at one time. Each PD's
location of the entire pattern is shown in figures 19 ~ 23. LPS codes of 73h, 78h and 6Bh are
used, respectively, for the standard size, the half-width size and DJCS (downloaded Japanese
character set) in conformity with Japanese teletext.
For type 1, six logical pixels of a character are loaded from each PD at one time. In each PD,
the least significant six bits are valid and the most significant two bits are always 11b. Each
PD's location of the entire pattern is shown in figures 24 ~ 26. LPS codes of 31h, 30h and 32h
are used, respectively, for ideographic, alphanumeric and alphanumeric character in conformity
with UK teletext.
The logical pixels defined as "1" shall be displayed in foreground colour and the logical pixels
defined as "0" shall be displayed in background colour.
7.5 Coding of DCS data
Some languages have a lot of character sets. For instance, the Japanese two-byte set consists
of level 1 of the Kanji set (2 965 sets), the non-Kanji set (524 sets) and an additional set for
Japanese teletext (173 sets). Level 1 of the Kanji character set is sufficient to express most of
the kanji applications. However, for Japanese names for example, it may need some
characters of level 2 of the Kanji set (3 388 sets) to express it. In this character information
system, level 2 of the Kanji set is optional. The DCS method designed is to display such
characters.
DCS data are stored in a text unit whose TEXT TYPE in TEXT HEADER pack is equal to 0Dh
for-two byte coded font and consists of similar DRCS data. The difference between DRCS data
and DCS data is the TEXT CODE and TRM. While the TEXT CODE for DRCS is equal to FFh,
the TEXT CODE for DCS is equal to the two-byte set codes. TRM code for DCS is equal to FFh
which is indicative of no information. These are not necessary for all consumer digital VCRs
which can display the character information to store or load the DCS data.

61834-5  IEC:1998(E) – 17 –
For storing the DCS data, the following sequence shall be used.
a) Store character information data which includes some optional codes.
b) Store required DCS data for optional codes using some text units.
For displaying optional codes, there are certain patterns.
a) If a consumer digital VCR has a code ROM for optional characters such as level 2 of the
Kanji set, there is no need to load the DCS data because it can display these optional
characters.
b) Even if a consumer digital VCR does not have a code ROM for optional characters, it can
display these optional characters by loading the DCS data.
c) If a consumer digital VCR does not have the capability of displaying the optional characters
and the loading character information has some optional character codes, it depends on the
VCR as to how these optional characters shall be displayed.
The data format is shown in figure 27. In the TEXT HEADER pack, the OPN is equal to 111b
and the TEXT TYPE is equal to 0Dh which means two-byte font data. One DCS data shall be
stored in one text unit. For three DCS data, they need three text units.
Figure 28 shows an example of a character information using DCS data. The character
belongs to the character set for level 2 of the Kanji set which is the option for the Japanese
...

IEC 61834-5
Edition 1.0 1998-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Recording – Helical-scan digital video cassette recording system using 6,35 mm
magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) –
Part 5: The character information system

Enregistrement – Système de magnétoscope numérique à cassette à balayage
hélicoïdal utilisant la bande magnétique de 6,35 mm destiné au grand public
(systèmes 525-60, 625-50, 1125-60 et 1250-50) –
Partie 5: Système à caractères d’information

Copyright © 1998 IEC, Geneva, Switzerland

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IEC 61834-5
Edition 1.0 1998-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Recording – Helical-scan digital video cassette recording system using 6,35 mm
magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) –
Part 5: The character information system

Enregistrement – Système de magnétoscope numérique à cassette à balayage
hélicoïdal utilisant la bande magnétique de 6,35 mm destiné au grand public
(systèmes 525-60, 625-50, 1125-60 et 1250-50) –
Partie 5: Système à caractères d’information

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 33.160.40 ISBN 2-8318-5150-5
– 2 – 61834-5  CEI:1998
SOMMAIRE
Pages
AVANT-PROPOS .6
Articles
1 Généralités .10
1.1 Domaine d’application.10
1.2 Références normatives .10
1.3 Définitions, symboles et abréviations.10
2 Structure des données du système à caractères d’information.12
2.1 Sujet.12
2.2 Unité sujet .12
2.3 Unité page .12
2.4 En-tête sujet, en-tête page.12
2.5 Unité texte et données texte.14
3 Paquets du système à caractères d’information.14
3.1 Paquet EN-TÊTE SUJET/PAGE .14
3.2 Paquets EN-TÊTE TEXTE et paquets TEXTE .14
3.3 Paquets de positionnement des données .16
3.4 Drapeau TEXTE .18
4 Mode complet .18
4.1 Sujets principaux et sujets optionnels.18
4.2 Sujet menu .20
4.3 Sujet TOC .20
5 Mode simple .20
6 Présentation .22
6.1 Zone d’affichage .22
6.2 Mode d’affichage .22
6.3 Espace caractère.22
6.4 Format d’affichage et taille des caractères .24
6.5 Position active .24
7 Codage.24
7.1 Structure du code à huit éléments .24
7.2 Codes de commande .24
7.3 Techniques d’extension du code .26
7.4 Codage de données DRCS .30
7.5 Codage des données DCS .32

61834-5  IEC:1998 – 3 –
CONTENTS
Page
FOREWORD.7
Clause
1 General .11
1.1 Scope.11
1.2 Normative reference .11
1.3 Definitions, symbols and abbreviations.11
2 Data structure of the character information system .13
2.1 Topic .13
2.2 Topic unit .13
2.3 Page unit .13
2.4 Topic header, page header .13
2.5 Text unit and text data .15
3 Packs for the character information system .15
3.1 TOPIC/PAGE HEADER pack.15
3.2 TEXT HEADER packs and TEXT packs .15
3.3 Packs for positioning data.17
3.4 TEXT flag .19
4 Full mode.19
4.1 Main topics and optional topics .19
4.2 Menu topic.21
4.3 TOC topic .21
5 Simple mode.21
6 Presentation .23
6.1 Displaying area.23
6.2 Display mode.23
6.3 Character space .23
6.4 Display format and character size .25
6.5 Active position .25
7 Coding.25
7.1 The structure of the 8-bit code .25
7.2 Control codes .25
7.3 Code extension techniques .27
7.4 Coding of DRCS data.31
7.5 Coding of DCS data .33

– 4 – 61834-5  CEI:1998
Pages
Figure 1 – Structure des données du système à caractères d’information.34
Figure 2 – Unité sujet et unité page .36
Figure 3 – Paquets concernant le texte.40
Figure 4 – Données de positionnement dans le sujet TOC .42
Figure 5 – Exemple de paquet EN-TÊTE TEXTE TITRE dans MIC .44
Figure 6 – Exemple de sujet menu.46-50
Figure 7 – Exemple de cassette pré-enregistrée .52
Figure 8 – Ecran d’un TOC .54
Figure 9 – Exemple de sujet TOC .56-60
Figure 10 – Exemple de cassette pré-enregistrée en mode simple .62
Figure 11 – Exemple de cassette enregistrée par l’utilisateur en mode simple.64
Figure 12 – Ecran d’unité et zone d’affichage.64
Figure 13 – Densité standard.68
Figure 14 – Haute densité .7 0
Figure 15 – Tableau des codes.72
Figure 16 – Codes de commande de la position active.82
Figure 17 – Méthode d'extension des codes à l’aide d’une séquence d’échappement .84
Figure 18 – Structure des données DRCS sur la bande.88
Figure 19 – LPS = 73h.92
Figure 20 – LPS = 78h.92
Figure 21 – LPS = 6Bh .92
Figure 22 – LPS = 33h.92
Figure 23 – LPS = 38h.92
Figure 24 – LPS = 31h.94
Figure 25 – LPS = 30h.94
Figure 26 – LPS = 32h.94
Figure 27 – Structure des données DCS sur la bande .96
Figure 28 – Exemple de caractères d’information utilisant des données DCS .98
Tableau 1 – Tableau du paquet en-tête.38
Tableau 2 – Modes d’affichage .40
Tableau 3 – Formats d'affichage.66
Tableau 4 – Taille des caractères .66
Tableau 5 – Codes de commande C0 sauf pour LS0, LS1, SS2, SS3 .74
Tableau 6 – Codes de commande C1 .76-80
Tableau 7 – Codes d'indication.86
Tableau 8 – Codes d'appel .86
Tableau 9 – Codes de changement d'OPN.86
Tableau 10 – Octet final pour DRCS .90
Tableau 11 – Type de LPS .90

61834-5  IEC:1998 – 5 –
Page
Figure 1 – Data structure of the character information system.35
Figure 2 – Topic unit and page unit.37
Figure 3 – Packs concerning text.41
Figure 4 – Position data in TOC topic .43
Figure 5 – Example of TITLE TEXT HEADER pack in MIC .45
Figure 6 – Example of a menu topic.47-51
Figure 7 – Example of pre-recorded tape.53
Figure 8 – Display image of a TOC .55
Figure 9 – Example of TOC topic.57-61
Figure 10 – Example of pre-recorded tape in simple mode.63
Figure 11 – Example of user’s tape in simple mode .65
Figure 12 – Unit screen and displaying area .65
Figure 13 – Standard density.69
Figure 14 – High density.71
Figure 15 – Code table .73
Figure 16 – Active position control codes.83
Figure 17 – Code extension method using escape sequence .85
Figure 18 – Data structure of DRCS data on tape .89
Figure 19 – LPS = 73h.93
Figure 20 – LPS = 78h.93
Figure 21 – LPS = 6Bh .93
Figure 22 – LPS = 33h.93
Figure 23 – LPS = 38h.93
Figure 24 – LPS = 31h.95
Figure 25 – LPS = 30h.95
Figure 26 – LPS = 32h.95
Figure 27 – Data structure of DCS data on tape.97
Figure 28 – Example of a character information using DCS data .99
Table 1 – Pack header table.39
Table 2 – Display modes .41
Table 3 – Display formats.67
Table 4 – Character size .67
Table 5 – C0 control codes except for LS0, LS1, SS2, SS3.75
Table 6 – C1 control code.77-81
Table 7 – Designation codes .87
Table 8 – Invocation codes.87
Table 9 – OPN-change codes.87
Table 10 – Final byte for DRCS .91
Table 11 – Type of LPS .91

– 6 – 61834-5 © CEI:1998
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
ENREGISTREMENT – SYSTÈME DE MAGNÉTOSCOPE NUMÉRIQUE
À CASSETTE À BALAYAGE HÉLICOÏDAL UTILISANT
LA BANDE MAGNÉTIQUE DE 6,35 mm DESTINÉ AU GRAND PUBLIC
(SYSTÈMES 525-60, 625-50, 1125-60 ET 1250-50) –

Partie 5: Système à caractères d’information

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
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2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
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responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 61834-5 a été établie par le sous-comité 100B: Systèmes de
stockage d’informations multimédia, vidéo et audio, du comité d'études 100 de la CEI:
Systèmes et appareils audio, vidéo et multimédia.
La présente version bilingue, publiée en 2000-03, correspond à la version anglaise.
Le texte anglais de cette norme est basé sur les documents 100B/167/FDIS et 100B/179/RVD.
Le rapport de vote 100B/179/RVD donne toute information sur le vote ayant abouti à
l'approbation de cette norme.
La version française de cette norme n'a pas été soumise au vote.
Cette publication a été rédigée selon les Directives ISO/CEI, Partie 3.

61834-5 © IEC:1998 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
RECORDING – HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING
SYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE
(525-60, 625-50, 1125-60 AND 1250-50 SYSTEMS) –
Part 5: The character information system

FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
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members of its technical committees and IEC National Committees for any personal injury, property damage or
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61834-5 has been prepared by subcommittee 100B: Audio, video
and multimedia information storage systems, of IEC technical committee 100: Audio, video and
multimedia systems and equipment.
This bilingual version, published in 2000-03, corresponds to the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
100B/167/FDIS 100B/179/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

– 8 – 61834-5  CEI:1998
La CEI 61834 est constituée des parties suivantes:
– Partie 1: Spécifications générales;
– Partie 2: Format SD pour les systèmes 525-60 et 625-50;
– Partie 3: Format HD pour les systèmes 1125-60 et 1250-50;
– Partie 4: Tableau des paquets en-tête et leur contenu;
– Partie 5: Système à caractères d’information.
Cette partie 5 décrit le système à caractères d’information s’appliquant à tout le système vidéo
d’enregistrement numérique à cassette à balayage hélicoïdal.
La partie 1 décrit les spécifications communes au système d’enregistrement vidéo numérique à
cassette à balayage hélicoïdal utilisant la bande magnétique de 6,35 mm.
La partie 2 décrit les spécifications pour les systèmes 525-60 et 625-50 non contenues dans la
partie 1.
La partie 3 décrit les spécifications pour les systèmes 1125-60 et 1250-50 non contenues dans
les parties 1 et 2.
La partie 4 décrit le tableau des paquets en-tête et le contenu des paquets s’appliquant à la
totalité du système vidéo d’enregistrement numérique à cassette à balayage hélicoïdal.
Pour fabriquer des systèmes vidéo d’enregistrement numérique à cassette SD, on se réfère
aux parties 1, 2, 4 et 5.
Pour fabriquer des systèmes vidéo d’enregistrement numérique à cassette HD, on se réfère
aux parties 1, 2, 3, 4 et 5.
61834-5  IEC:1998 – 9 –
IEC 61834 consists of the following parts:
– Part 1: General specifications;
– Part 2: SD format for 525-60 and 625-50 systems;
– Part 3: HD format for 1125-60 and 1250-50 systems;
– Part 4: The pack header table and the contents;
– Part 5: The character information system.
This document is part 5 and describes the character information system which is applicable to
the whole recording system of the helical-scan digital video cassette.
Part 1 describes the common specifications for the helical-scan digital video cassette recording
system using 6,35 mm magnetic tape.
Part 2 describes the specifications for 525-60 and 625-50 systems which are not included in
part 1.
Part 3 describes the specifications for 1125-60 and 1250-50 systems which are not included in
part 1 and part 2.
Part 4 describes the pack header table and the contents of packs which are applicable to the
whole recording system of the helical-scan digital video cassette.
For manufacturing SD digital video cassette recording systems part 1, part 2, part 4 and part 5
are referred to.
For manufacturing HD digital video cassette recording systems part 1, part 2, part 3, part 4 and
part 5 are referred to.
– 10 – 61834-5  CEI:1998
ENREGISTREMENT – SYSTÈME DE MAGNÉTOSCOPE NUMÉRIQUE
À CASSETTE À BALAYAGE HÉLICOÏDAL UTILISANT
LA BANDE MAGNÉTIQUE DE 6,35 mm DESTINÉ AU GRAND PUBLIC
(SYSTÈMES 525-60, 625-50, 1125-60 ET 1250-50) –
Partie 5: Système à caractères d’information
1 Généralités
1.1 Domaine d’application
La présente partie de la CEI 61834 spécifie le système à caractères d'information applicable
à l'ensemble du système d'enregistrement des magnétoscopes numériques à cassette à
balayage hélicoïdal sur bande magnétique de 6,35 mm. Ce système donne la méthode
d'enregistrement des caractères en plusieurs langues et, de plus, il est facile d'emploi.
1.2 Références normatives
Les documents normatifs suivants contiennent des dispositions qui, par suite de la référence
qui y est faite, constituent des dispositions valables pour la présente partie de la CEI 61834.
Pour les références datées, les amendements ultérieurs ou les révisions de ces publications ne
s’appliquent pas. Toutefois, les parties prenantes aux accords fondés sur la présente partie de
la CEI 61834 sont invitées à rechercher la possibilité d'appliquer les éditions les plus récentes
des documents normatifs indiqués ci-après. Pour les références non datées, la dernière édition
du document normatif en référence s’applique. Les membres de la CEI et de l'ISO possèdent
le registre des Normes internationales en vigueur.
ISO/CEI 2022:1994, Technologies de l'information – Structure de code de caractères et
techniques d'extension
1.3 Définitions, symboles et abréviations
Pour les besoins de la présente norme, les définitions et abréviations suivantes s’appliquent:
DCS: Jeu de caractères téléchargé
DJCS: Jeu de caractères japonais téléchargé
DRCS: Jeu de caractères redéfinissables en cours d’exécution
LPS: Structure logique des pixels
OPN: Numéro d’option
PD: Données modèle
TRM: Mode de transmission
61834-5  IEC:1998 – 11 –
RECORDING – HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING
SYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE
(525-60, 625-50, 1125-60 AND 1250-50 SYSTEMS) –
Part 5: The character information system
1 General
1.1 Scope
This part of IEC 61834 specifies the character information system which is applicable to the
whole recording system of the helical-scan digital video cassette using 6,35 mm 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 normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 61834. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this part of IEC 61834 are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the
latest edition of the normative document referred to applies. Members of IEC and ISO 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.
DCS: 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
– 12 – 61834-5  CEI:1998
2 Structure des données du système à caractères d’information
Les données à caractères d'information sont enregistrées dans la zone optionnelle AAUX,
VAUX, Sous-code et MIC, sous la forme d'un paquet. La figure 1 présente le système à
caractères d'information.
Structure des données en mode complet:
Sujet = 1 unité sujet
Unité sujet = en-tête de sujet + données de positionnement × m + unité page × n
Unité page = en-tête de page + groupe d’unités texte = en-tête de page + unité texte × k
Unité texte = en-tête de texte + données de texte
où
m = 1 pour un sujet TOC
m = 0 pour d’autres sujets
n = 1, 2, 3.
k = 1, 2, 3.
I = 1, 2, 3.
Structure de données en mode simple:
Groupe d’unités texte = unité texte × j
Unité texte = en-tête de texte + données de texte
où
j = 1, 2, 3.
2.1 Sujet
Le mode complet est constitué de plusieurs sujets sélectionnés par un réalisateur. Chaque
sujet est constitué d'une seule unité sujet.
2.2 Unité sujet
Chaque type d'unité sujet a un contenu différent. A l'exception des sujets TOC, chaque unité
sujet est composée d'un en-tête de sujet et de quelques unités page. Pour les sujets TOC, il
existe des données de positionnement entre l'en-tête sujet et l'unité page 1.
2.3 Unité page
Chaque unité page est composée d'un en-tête de page et d'un groupe d'unités texte. Un
groupe d'unités texte possède plusieurs unités texte. Il existe quatre modes d'affichage par
page, présentés dans le tableau 2. La quantité maximale de données de caractère dans une
unité page est par conséquent limitée au nombre de caractères pouvant être affichés
simultanément.
2.4 En-tête sujet, en-tête page
Pour les en-têtes sujet et page, le paquet EN-TÊTE SUJET/PAGE dans le groupe COMMANDE
(en-tête de paquet = 07h) doit être utilisé. Les deux premiers octets des données du paquet de
4 octets dans le paquet EN-TÊTE SUJET/PAGE forment l'en-tête sujet, les deux derniers
octets forment l'en-tête page.

61834-5  IEC:1998 – 13 –
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:
Topic = topic unit 1
Topic unit = topic header + position data × m + page unit × n
Page unit = page header + 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.
I = 1, 2, 3.
Data structure of the simple mode:
Text unit group = text unit × j
Text unit = text header + text data
where
j = 1, 2, 3.
2.1 Topic
The full 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 between 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 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 topic header part and the latter two bytes are the page
header part.
– 14 – 61834-5  CEI:1998
La partie en-tête sujet possède une ÉTIQUETTE SUJET. Un sujet dont l'ÉTIQUETTE SUJET = 01h
est un sujet TOC nécessitant des données de positionnement. La partie en-tête page possède un
numéro d'unité page (PU), comme le montre la figure 2. Le numéro PU doit être augmenté unité par
unité à partir de 00h pour un sujet TOC, et à partir de 01h pour les autres sujets. De plus amples
informations sur le paquet EN-TÊTE SUJET/PAGE sont données dans la CEI 61834-4.
La figure 2a montre une unité sujet pour un TOC. Le premier paquet EN-TÊTE SUJET/PAGE
est l'en-tête sujet. Son ÉTIQUETTE SUJET est 01h, son numéro PU est 00h. Les données
suivantes sont des données de positionnement indiquant la position de départ des titre,
chapitre, partie, etc. sélectionnées par un réalisateur.
Le paquet EN-TÊTE SUJET/PAGE suivant est l'en-tête de page. Son ÉTIQUETTE SUJET est
01h, son numéro PU est 01h. Les deux premiers octets des données de paquet de 4 octets
dans les paquets EN-TÊTE SUJET/PAGE d'un sujet ont un contenu identique permettant la
vérification. Les données suivantes sont fournies par le groupe d'unités texte, comprenant les
données texte à afficher.
La figure 2b montre une unité sujet qui n'est pas un TOC et qui ne nécessite pas de données
de positionnement. Par conséquent, le premier paquet EN-TÊTE SUJET/PAGE se compose de
l'en-tête sujet et du premier en-tête page. Son ÉTIQUETTE SUJET n'est pas 01h, son numéro
PU est 01h.
La figure 2c montre une unité page et un groupe d'unités texte. Une unité page est constituée
d'un en-tête page et d'un groupe d'unités texte possédant plusieurs unités texte.
2.5 Unité texte et données texte
Une unité texte se compose d’un en-tête texte et de données texte.
Pour la bande, les données texte sont composées d'un paquet EN-TÊTE TEXTE et de paquets
TEXTE qui adoptent une structure de paquet de longueur fixe, comme le montre la figure 2c.
Pour le MIC, les données texte comprennent un paquet EN-TÊTE TEXTE qui adopte une
structure de paquet de longueur variable, comme le montre la figure 3.
Les données texte doivent être stockées en tant que codes de caractère dans les unités texte.
3 Paquets du système à caractères d’information
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