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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 60843-4:2001 IEC 60
2、843-4:2000 The European Standard EN 60843-4:2000 has the status of a British Standard ICS 33.160.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Helical-scan video tape cassette system using 8 mm magnetic tape (8 mm video) Part 4: Video subcode (VSC) Licensed Copy: sheffiel
3、dun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 2001 BSI 04-200
4、1 ISBN 0 580 36848 3 BS EN 60843-4:2001 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the official English language version of EN 60843-4:2000. It is identical with IEC 60843-4:2000. The UK participation in its preparation was entrusted by Techni
5、cal Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/2, Recording, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for cha
6、nge, and keep the UK interests informed; monitor related 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
7、to the old number. For instance, IEC 27-1 has been 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 nor
8、mally include an annex which lists normative references 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 Internationa
9、l Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British St
10、andard 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 26, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document wa
11、s last issued. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon N
12、ov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 CONTENTS Page Clause 1General . 5 1.1Scope. 5 1.2Normative references . 5 2Area allocation and dimensions . 5 2.1Types of video subcode (VSC) 5 2.21 block VSC 5 2.35 block VSC 5 3Data structure 6 3.11 block VSC 6 3.25 block VSC 6
13、4Channel coding 6 4.1Modulation 6 4.2Transmission rate. 6 4.3Erase code . 6 4.4Search mark . 6 4.5Synchronization code . 7 4.6End mark 7 5Data contents 7 5.1Block 7 5.2Word 7 5.3CRC code and error detection. 7 5.4Mode 7 6Recording method of mode data (Block 4) . 8 6.1Time code. 8 6.2Recording date/R
14、ecording time. 8 6.3Video control code 8 6.4Pre-recorded tape modes . 8 Annex A (normative) Code assignment 19 Annex B (informative) Pre-recorded tape . 25 Annex ZA (normative) Normative references to international publications with their corresponding European publications 26 Figure 1 Area allocati
15、on and dimensions of 1 block VSC. 9 Figure 2 Area allocation and dimensions of 5 block VSC with PCM audio 10 Figure 3 Area allocation and dimensions of 5 block VSC without PCM audio. 11 Figure 4 1 block VSC 12 Figure 5 5 block VSC 13 Figure 6 Synchronization code 14 Page 3 EN 608434:2000 Licensed Co
16、py: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 Page Table 1 Search mark. 14 Table 2 Block contents 14 Table 3 Word contents 15 Table 4 Mode contents 15 Table 5 Time code (525 line 60 field system) 15 Table 6 Time code (625 line 50 field sy
17、stem) 16 Table 7 Recording date/Recording time (525 line 60 field system) 16 Table 8 Recording date/Recording time (625 line 50 field system) 16 Table 9 Recording length 17 Table 10 Pre-recorded tape (525 line 60 field system) 17 Table 11 Pre-recorded tape (625 line 50 field system) 18 Table A.1 Con
18、trol command 20 Table A.2 Numeral code 24 Table B.1 Structure of pre-recorded tape. 25 Page 4 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING 8 mm MAGNETIC TAPE (8 mm V
19、IDEO) Part 4: Video subcode (VSC) 1 General 1.1 Scope This part of IEC 60843 specifies a method of auxiliary data recording and playback with the IEC 60843 8 mm video system. This part is applicable to both 525 line 60 field and 625 line 50 field television systems. 1.2 Normative references The foll
20、owing normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60843. 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 60843
21、 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 Standar
22、ds. IEC 60461:1986, Time and control code for video tape recorders IEC 60843 (all parts), Helical-scan video tape cassette system using 8 mm magnetic tape 2 Area allocation and dimensions 2.1 Types of video subcode (VSC) There are two types of VSC which are 1 block VSC and 5 block VSC. 2.2 1 block V
23、SC Figure 1 shows the recording area of 1 block VSC. The recording area of 1 block VSC shall be specified by the head switching point. All of the data area, search mark and erase code should be recorded. 2.3 5 block VSC 2.3.1 5 block VSC with PCM audio Figure 2 shows the recording area of 5 block VS
24、C with PCM audio. The recording area of 5 block VSC with PCM audio shall be specified by the distance from the head switching point. Page 5 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 All the data area, search
25、mark and erase code should be recorded. The erase code should have a variable length relative to the position of PCM data area. 2.3.2 5 block VSC without PCM audio Figure 3 shows the recording area of 5 block VSC without PCM audio. The recording area of 5 block VSC without PCM audio shall be specifi
26、ed by the distance from the head switching point. All of the data area, search mark and erase code should be recorded. 3 Data structure 3.1 1 block VSC Figure 4 shows the data area of 1 block VSC. 1 block VSC consists of a block named Block 4. Block 4 is common to 5 block VSC and 1 block VSC. 3.2 5
27、block VSC Figure 5 shows the data area of 5 block VSC. 5 block VSC has an extended data area from Block 0 to Block 3. 4 Channel coding 4.1 Modulation The modulation method shall be a bi-phase mark, except for the synchronization code. 4.2 Transmission rate The transmission rate shall be 368 times th
28、e horizontal sync frequency, 5,79 Mbit/s for the 525 line 60 field system and 5,75 Mbit/s for the 625 line 50 field system. 4.3 Erase code The erase code shall be all “1”. 4.4 Search mark The data sign of the search mark shall be all “0” for enable. Page 6 EN 608434:2000 Licensed Copy: sheffieldun s
29、heffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 The data sign of the search mark shall be all “1” for disable. Table 1 shows the recording condition of the search mark. 4.5 Synchronization code Figure 6 shows the synchronization code. The synchronization co
30、de indicates the start position of each CRC block. 4.6 End mark The end mark shows the end of the data area. The end mark consists of 12 successive synchronization codes. 5 Data contents 5.1 Block Table 2 shows the contents of the block. A block consists of the synchronization code, five words and t
31、he CRC code. Blocks from Block 0 to Block 3 shall be used with 5 block VSC only. Block 4 is common to 5 block VSC and 1 block VSC. 5.2 Word Table 3 shows the contents of the word. Word 0 shows the mode which indicates a category of data code. Words from Word 1 to Word 4 consist of the data code for
32、the mode. 5.3 CRC code and error detection The error detection system shall be based on the CRC method. The CRC block consists of five words and the CRC code. The CRC code contains 8 bits and its generator polynomial G(x) shall be as follows: MSB LSB G(x) = ?8 + 1 (preset “11001100“) 5.4 Mode Table
33、4 shows the outline of the contents of the mode. See annex A for details. Page 7 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 6 Recording method of mode data (Block 4) 6.1 Time code 6.1.1 Basic recording rules T
34、he time code shall be recorded on all the tracks if it is not necessary to record other data. If other data are recorded, by replacing some of the time code data, the time code shall be recorded at least by the pattern specified in 6.1.2. 6.1.2 Recording patterns Tables 5 and 6 show the recording co
35、nditions of the time code. 6.2 Recording date/Recording time 6.2.1 Basic recording rules The recording date/recording time shall be recorded on the specific track simultaneously with the time code. The recording date and the recording time shall be recorded simultaneously. 6.2.2 Recording patterns T
36、ables 7 and 8 show the recording conditions of the recording date/recording time. 6.3 Video control code The contents shall be indicated in accordance with clause A.4. 6.3.1 Recording rules The video control code shall be recorded on the same track as the other data. Both video control code and time
37、 code shall be recorded. For pre-recorded tape, the video control code shall be recorded on the track on which the next chapter code is permitted to be recorded. 6.3.2 Recording length Table 9 shows the recording length of the video control code. 6.4 Pre-recorded tape modes 6.4.1 Contents of mode Pr
38、e-recorded tape can deal with four modes: the present chapter, the next chapter, the pre- recorded tape ID and the total time/total chapter numbers in addition to the time code. The “time code” shows the time elapsed in the active programme. The “present chapter” shows the chapter number at the tape
39、 position and the time elapsed in the chapter. Page 8 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 The “next chapter” shows the next chapter number and the remaining time of the present chapter. The “pre-recorde
40、d tape ID” indicates the pre-recorded tape. The “total time/total chapter number” shows the total chapter number and the time elapsed in the active programme. 6.4.2 Basic recording rules All the data should be recorded according to the rules shown in tables 10 and 11. The present chapter and the nex
41、t chapter shall be recorded in pairs. The pre-recorded tape ID and the total data shall be recorded in pairs. The time code and the chapter number of the present chapter are mandatory. The time code shall be based on a non-drop frame sequence. The length of each chapter shall be more than 2 min. 6.4
42、.3 Recording patterns Tables 10 and 11 show the recording patterns of pre-recorded tape. Erase code Search mark Data area Video overlap After recording margin Direction of head motion PCM data area *2,3 H (2,8 H) *1,0 H (1,0 H) *1,0 H (1,3 H) *0,24 H (0,24 H) VSC area Video Head switching position I
43、EC 121/2000 Key *: 525 line 60 field system (): 625 line 50 field system H: horizontal scanning line The figure is viewed from the magnetic coating side. NOTE The tolerance of the distance from the switching position to the end of the data area along the track is: ? (2,3 0,75) H for the 525 line 60
44、field system; ? (2,8 0,90) H for the 625 line 50 field system. Figure 1 Area allocation and dimensions of 1 block VSC Page 9 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 Erase codeSearch mark Video overlap After
45、 recording margin Direction of head motion PCM data area *2,3 H (2,8 H) *1,0 H (1,0 H) VSC area Video Head switching position *0,8 H (0,8 H) Data area 0,1 H IEC 122/2000 Key *: 525 line 60 field system (): 625 line 50 field system H: horizontal scanning line The figure is viewed from the magnetic co
46、ating side. NOTE The tolerance of the distance from the switching position to the end of the data area along the track is: ? (2,3 0,75) H for the 525 line 60 field system; ? (2,8 0,90) H for the 625 line 50 field system. Figure 2 Area allocation and dimensions of 5 block VSC with PCM audio Page 10 E
47、N 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 Erase codeSearch mark Video overlap Direction of head motion *2,3 H (2,8 H) *1,0 H (1,0 H) VSC area Video Head switching position *0,8 H (0,8 H) Data area *3,5 H (3,9
48、H) IEC 123/2000 Key *: 525 line 60 field system (): 625 line 50 field system H: horizontal scanning line The figure is viewed from magnetic coating side. NOTE The tolerance of the distance from the switching position to the end of the data area along the track is: ? (2,3 0,8) H for the 525 line 60 f
49、ield system; ? (2,8 1,0) H for the 625 line 50 field system. Figure 3 Area allocation and dimensions of 5 block VSC without PCM audio Page 11 EN 608434:2000 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 02:23:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2001 *Sync Erase code Search mark Data area Recording direction Block 4 *End 36 bits 51 bits 1 CRC Block ( 48 bits ) 3 bits8 bits8 bits8 bits8 bits8 bits8 bits Word 0Word 1