1、BRITISH STANDARD O Video recording - Helical-scan digital component video cassette recording format using 12,65mm magnetic tape and incorporating data compression (Format digit al-L) The European Standard EN 61904:2000 has the status of a British Standard ICs 33.160.40 BS EN 61904:200 1 IEC 61904:20
2、00 Incorporating Corrigendum No. 1 NO COPMNG WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61904:2001 Amd. No. 13255 Corrigendum No. 1 National foreword Date Comments June 2001 Correction to title on front cover This British Standard is the official English language version of EN
3、 61904:2000 The UK participation in its preparation was entrusted by Technical Committee EPL1100, Audio, video and multimedia systems and equipment, to Subcommittee EPL1100/2, Recording, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible internation
4、allEuropean 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 the UK. - A list of organizations represented on this subcommittee can be obtained on request to its
5、secretary. From 1 January 1997, all IEC publications have the number 60000 added 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. C
6、ross-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 publications. The British Standards which implement these international or European publications ma
7、y 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 Standard does not purport to include all the necessary provisions of a contract. Users of British S
8、tandards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Sta
9、ndards Committee and comes into effect on 15June2001 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 84, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued.
10、Amendments issued since publication O BSI 06-2001 I I ISBN O 580 37294 4 EUROPEAN STANDARD EN 61904 NORME EUROPENNE EUROPISCHE NORM September 2000 ICs 33.160.40 English version Video recording Helical-scan digital component video cassette recording format using 12,65 mm magnetic tape and incorporati
11、ng data compression (Format digital-L) (IEC 61 904:2000) Enregistrement vido Format denregistrement numrique composantes cassette balayage hlicodal utilisant la bande magntique de 12,65 mm avec compression de donnes (Format numrique L) (CE1 61 904:2000) Videoaufzeichnung Videokassettenaufzeichnung m
12、it Schrgspuraufzeichnung digitaler Komponenten-Signale auf Magnetband 12,65 mm, verbunden mit Datenkompression (Digital-L-Format) -. (IEC 61904:2000) - .r This European Standard was approved by CENELEC on 2000-06-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which
13、 stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European S
14、tandard 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 own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the na
15、tional electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit
16、Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels O 2000 CENELEC - All tights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61904:2000 E Page 2 EN 61
17、904:2000 Foreword lhe text of document 100B/248/FDIS, future edition 1 of IEC 61904, prepared by SC IOOB, Audio, video and multimedia information storage systems, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENE
18、LEC as EN 61904 on 2000-06-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the national standards conflicting with the EN have to be withdrawn Annexes d
19、esignated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annexes A and B are informative. Annex A has been added by CENELEC. (dop) 2001-03-01 (dow) 2003-06-01 Endorsement notice lhe text o
20、f the International Standard IEC61904:2000 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60735 NOTE: Harmonized as EN 607351991 (not modified). IEC 60961 NOTE:
21、Harmonized as EN 60961:1994 (not modified). Page 3 EN 61904:2000 CONTENTS Page Clause 1 2 4 General . 6 1.1 Scope . 6 1.2 Normative references . 6 1.3 Abbreviations . 7 1.4 Environment and test conditions . 7 1.5 Reference tape . 7 1.6 Calibration tape 7 2.1 Mechanical parameters of cassette 9 Helic
22、al recordings . 11 3.1 Tape speed . 11 3.2 Record location and dimensions 11 3.3 Helical track record tolerance zones 12 3.4 Gap azimuth 12 Programme track data arrangement 14 4.1 Introduction 14 4.2 Labelling convention 14 Videotape cassette and tape 9 2.2 Magnetic tape 11 4.3 Sector details 14 4.4
23、 Edit gap . 17 4.5 Channel coding . 17 4.6 Tracking servo signals . 18 4.7 Magnetization 18 Data arrangement in video sectors . 18 5.1 Introduction . 18 5.2 Recorded data . 19 5.3 Data shuffling 19 5.4 DCT (discrete cosine transform) 21 5.5 Quantization 21 5.6 VLC (variable length code) 23 5.7 Data
24、arrangement in sync blocks . 29 5.8 Outer ECC 31 Data arrangement in audio sectors . 32 6.1 General . 32 6.2 Source data . 32 6.4 Outer ECC 37 Video audio interface 38 7.1 Video interface 38 7.2 Audio interface 38 Longitudinal tracks . 38 8.1 Relative timing 38 8.2 Control track . 39 8.3 Cue recordi
25、ng 40 8.4 Time and control code recording . 40 6.3 Shuffling 34 O BSI 06-2001 1 Page 4 EN 61904:2000 e Page Annex A (informative) Annex B (informative) Tape transport and scanner 77 Compatibility with analogue type-L . 82 Annex ZA (normative) Normative references to international publications with t
26、heir corresponding European publications . 84 Bibliography 83 Figure 1 . Top view and side view of S cassette . 41 Figure 2 . Bottom view of S cassette . 42 Figure 3 . Datum spots. supporting areas and tape guides . 44 Figure 4 . Location of reels ready for rotation . 45 Figure 5 . Protecting lid .
27、46 Figure 6 . Reel 47 Figure 8 . Unlocking lever insertion area 48 Figure 9 . Lid unlocking force 49 Figure 10 . Lid opening force . 49 Figure 11 . Reel spring force . 49 Figure 12 . Strength of safety plug . 50 Figure 13 . Extraction force (FI, F2) and friction torque . 50 Figure 14 . Top view and
28、side view of L cassette . 51 Figure 15 . Bottom view of L cassette 52 Figure 16 . Datum spots, supporting areas and tape guides . 54 Figure 17 . Location of reels ready for rotation . 55 Figure 18 . Protecting lid . 56 Figure 19 . Reel 57 Figure 20 . Height of reels ready for rotation 57 Figure 21 .
29、 Unlocking lever insertion area 58 Figure 22 . Lid unlocking force 59 Figure 23 . Lid opening force . 59 Figure 24 . Reel spring force . 59 Figure 25 . Strength of safety plug . 60 Figure 26 . Extraction force (FI, F2) and friction torque . 60 Figure 27 . Locations and dimensions of recorded tracks
30、. 61 Figure 28 . Locations and dimensions of tolerance zones of helical track records . 62 Figure 29 . Sector arrangement on helical tracks for 525/60 and 625/50 systems . 63 Figure 30 . Sync block format 64 Figure 31 . Track, segment and field numbers . 64 Figure 32 . Analogue to digital timing rel
31、ationship (525160 system) . 65 Figure 33 . Analogue to digital timing relationship (625/50 system) . 65 Figure 34 . Digital vertical blanking (525/60 system) 66 Figure 35 . Digital vertical blanking (625/50 system) 66 Figure 36 . Shuffling (sector distribution) . 67 Figure 7 . Height of reels ready
32、for rotation 47 e O BSI 06-2001 O Page 5 EN 61904:2000 Page Figure 37 . Structure of VLC group 68 Figure 38 . Structure of coefficient clusters 68 Figure 39 . Sync blocks construction . 69 Figure 40 . Video block interleave for 525/60 system . 70 Figure 41 . Video block interleave for 625/50 system
33、. 71 Figure 42 . Audio video timing . 72 Figure 43 . Audio data word assignment 72 Figure 44 . Ancillary data 72 Figure 45 . Data word allocation 72 Figure 46 . Intra-field shuffling for 525/60 system 73 Figure 47 . Block shuffling for 525/60 system . 73 Figure 48 . Intra-field shuffling for 625/50
34、system 74 Figure 49 . Block shuffling for 625/50 system . 74 Figure 50 . Channel sector shuffling 75 Figure 51 . Recorded control code waveform for 525160 system . 76 Figure 52 . Recorded control code waveform for 625/50 system . 76 Figure A.l . Possible scanner configuration (52960 system) 78 Figur
35、e A.2 . Possible scanner configuration (625/50 system) 79 Figure A.4 . P.oscible longitudinal head location and tape wrap (625/50 system) . 81 Table 1 . Tape length and play time . 9 Table 2 . Record location and dimensions for 525/60 and 625/50 systems . 13 Table 4 . Sector offset for 525/60 and 62
36、5/50 systems 20 Table 5 . Quantization 22 Table 6 . Category conversion 24 Table 8 . VLC for chrominance components . 27 Table A.l . Parameters for a possible scanner design 77 Table A.2 . Data rate and wavelength . 77 Table B.l . Comparison of digital-L/analogue type-L recording parameters 82 Figur
37、e A.3 . Possible longitudinal head location and tape wrap (525/60 system) . 80 . . . Table 3 . IDO Sync block number 15 . Table 7 . VLC for luminance component . 25 0 BSI 06-2001 Page 6 EN 61904:2000 VIDEO RECORDING - HELICAL-SCAN DIGITAL COMPONENT VIDEO CASSETTE RECORDING FORMAT USING 12,65 mm MAGN
38、ETIC TAPE AND INCORPORATING DATA COMPRESSION (FORM AT DIG I TAL -L) 1 General 1.1 Scope This International Standard applies to the format for video cassette recording of digital component video signals and associated digital audio signals and related control signals, using 12,65 mm magnetic tape. Th
39、e video data are recorded using data compression. This standard specifies characteristics of the cassettes, the tape, the recording patterns on the tape, the processes of digital audio and video coding, data compression, error protection and channel coding which are the essential requirements for in
40、terchangeability of recordings. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not
41、 apply. However, parties to agreements based on this International Standard 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
42、 of IEC and IS0 maintain registers of currently valid International Standards. IEC 60461:1986, Time and control code for video tape recorders IEC 60958:1989, Digital audio interface IEC 61 213:1993, Analogue audio recording on video tape - Polarity of magnetization IEC 61237-1:1994, Broadcast video
43、tape recorders - Methods of measurement - Part 1: Mechanical measurements ITU-R Recommendation BT.601-5:1995, Studio encoding parameters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios ITU-R Recommendation BS.647-2: 1992, A digital audio interface for broadcasting studios I
44、TU-R Recommendation BT.656-4: 1998, Interfaces for digital component video signals in 525-line and 625-line television systems operating at the 4:2:2 level of Recommendation ITU-R BT.601 (Part A) EBU Technical Recommendation R68:1995, Alignment level in digital audio production equipment and in digi
45、tal audio recorders O BSI 06-2001 Page 7 EN 61904:2000 1.3 Abbreviations O For the purposes of this International Standard, the following abbreviations apply. DCT: Discrete cosine transform ECC: Error correcting code TPS: Tracking pilot signal TTS: Tracking timing signal VLC: Variable length coding
46、1.4 Environment and test conditions Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditions: temperature: relative humidity: barometric pressure: tape tension: tape conditioning: 20 “C f 1 “C; 50 % f 2 %; from 86 kPa to
47、 106 kPa; 0,3 N f 0,05 N; not less than 24 h. e 1.5 Reference tape Two kinds of blank tape may be purchased from the following manufacturer: -*_ - Sony Corporation 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo, Japan Product name Puroose C2B-DB mechanical alignment C2A-DB electrical alignment 1.6 Calibr
48、ation tape Manufacturers of video tape recorders designed for this format specification may sell calibration tapes meeting the following requirements. This information is given for convenience of users of this International Standard and does not constitute an endorsement by the IEC of the product na
49、med. Equivalent products may be used if they can be shown to lead to the same results. 1.6.1 Record locations and dimensions Tolerance shown in table 2 should be reduced by 50 %. O BSI 06-2001 Page 8 EN 61904:2000 1.6.2 This tape is used for the purpose of aligning positions of stationary heads and rotary heads. Calibration tape for mechanical alignment Test sianals Vid eoaud io ch A/C - Ch BID - 4 MHz/l6 MHz/50 % flat field 8 MHz/l6 MHz/50 YO flat field Cue track 1 kHz o vu 12 kHz o vu 25 Hz (7:3 duty rectangle) Time code track Control track 50 Hz 1.6.3 Calibrat
