IEC 61834-5:1998 pdf download – Recording – Helical-scan digital video cassette recordingsystem using 6,35 mm magnetic tape forconsumer use (525-60,625-50, 1125-6oand 1250-50 systems)- Part 5: The character information system

IEC 61834-5:1998 pdf download – Recording – Helical-scan digital video cassette recordingsystem using 6,35 mm magnetic tape forconsumer use (525-60,625-50, 1125-6oand 1250-50 systems)- Part 5: The character information system.
This part of IEC 61834 specifies the character information system which is applicable to the whole recording system of the helicalscan 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 81834 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 relerred to applies. Members 01 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.
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 TOG 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 9.
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 colourbar 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. II a TITLE START pack is recorded in the TOG topic, users will be able to skip this area easily and see the title directly. For usefs 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 ri 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 wilh 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 TOG 4 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 TOG 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 1 Fh.