1、BRITISH STANDARD BS EN 61904:2001 IEC 61904:2000 Incorporating Corrigendum No. 1 Video recording Helical-scan digital component video cassette recording format using 12,65mm magnetic tape and incorporating data compression (Format digital-L) The European Standard EN 61904:2000 has the status of a Br
2、itish Standard ICS 33.160.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 61904:2001 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 ef
3、fect on 15 June 2001 BSI 06-2001 ISBN 0 580 37294 4 National foreword This British Standard is the official English language version of EN 61904:2000 The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommitt
4、ee EPL/100/2, Recording, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 6
5、0027-1. 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 normally include an annex which lists normative references to internation
6、al 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 “International Standards Correspondence Index”, or by using the “Find” facility of
7、 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 Standard does not of itself confer immunity from legal obligations.
8、aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages
9、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. Amendments issued since publication Amd. No. Date Comments 13255 Corri
10、gendum No. 1 June 2001 Correction to title on front coverEUROPEAN STANDARD EN 61904 NORME EUROPENNE EUROPISCHE NORM September 2000 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central
11、Secretariat: rue de Stassart 35, B - 1050 Brussels 2000 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61904:2000 E ICS 33.160.40 English version Video recording Helical-scan digital component video cassette recording format usin
12、g 12,65 mm magnetic tape and incorporating data compression(Format digital-L) (IEC 61904:2000) Enregistrement vido Format denregistrement numrique composantes cassette balayage hlicodal utilisant la bande magntique de 12,65 mm avec compression de donnes (Format numrique L) (CEI 61904:2000) Videoaufz
13、eichnung Videokassettenaufzeichnung mit Schrgspuraufzeichnung digitaler Komponenten-Signale auf Magnetband 12,65 mm, verbunden mit Datenkompression (Digital-L-Format) (IEC 61904:2000) This European Standard was approved by CENELEC on 2000-06-01. CENELEC members are bound to comply with the CEN/CENEL
14、EC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CE
15、NELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official version
16、s. CENELEC members are the national 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.Foreword The text of document 100B/248/FDI
17、S, future edition 1 of IEC 61904, prepared by SC 100B, 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 CENELEC as EN 61904 on 2000-06-01. The following dates
18、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 (dop) 2001-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2003-06-01 Annexes designated “normative“
19、 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 ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61904:2000 was appr
20、oved 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 60735:1991 (not modified). IEC 60961 NOTE: Harmonized as EN 60961:1994 (not modified). _ Page
21、2 EN61904:2000 BSI 06-2001 CONTENTS Page Clause 1 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 Videotape cassette and tape 9 2.1 Mechanical parameters of cassette 9 2.2 Magnetic tape1
22、1 3 Helical recordings.11 3.1 Tape speed .11 3.2 Record location and dimensions11 3.3 Helical track record tolerance zones12 3.4 Gap azimuth12 4 Programme track data arrangement14 4.1 Introduction .14 4.2 Labelling convention14 4.3 Sector details 14 4.4 Edit gap.17 4.5 Channel coding .17 4.6 Trackin
23、g servo signals.18 4.7 Magnetization18 5 Data arrangement in video sectors .18 5.1 Introduction .18 5.2 Recorded data.19 5.3 Data shuffling19 5.4 DCT (discrete cosine transform)21 5.5 Quantization21 5.6 VLC (variable length code) 23 5.7 Data arrangement in sync blocks.29 5.8 Outer ECC 31 6 Data arra
24、ngement in audio sectors .32 6.1 General.32 6.2 Source data.32 6.3 Shuffling34 6.4 Outer ECC 37 7 Video audio interface38 7.1 Video interface38 7.2 Audio interface38 8 Longitudinal tracks .38 8.1 Relative timing 38 8.2 Control track .39 8.3 Cue recording40 8.4 Time and control code recording .40 Pag
25、e3 EN61904:2000 BSI 06-2001 Page Annex A (informative) Tape transport and scanner77 Annex B (informative) Compatibility with analogue type-L .82 Annex ZA (normative) Normative references to international publications with their corresponding European publications84 Bibliography83 Figure 1 Top view a
26、nd 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.46 Figure 6 Reel47 Figure 7 Height of reels ready for rotation47 Figure 8 Unlocking lever insertion
27、area48 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 (F1, F2) and friction torque .50 Figure 14 Top view and side view of L cassette .51 Figure 15 Bottom view of L cassette52 Figure 16 Dat
28、um spots, supporting areas and tape guides .54 Figure 17 Location of reels ready for rotation.55 Figure 18 Protecting lid.56 Figure 19 Reel57 Figure 20 Height of reels ready for rotation57 Figure 21 Unlocking lever insertion area58 Figure 22 Lid unlocking force 59 Figure 23 Lid opening force.59 Figu
29、re 24 Reel spring force.59 Figure 25 Strength of safety plug.60 Figure 26 Extraction force (F1, F2) and friction torque .60 Figure 27 Locations and dimensions of recorded tracks .61 Figure 28 Locations and dimensions of tolerance zones of helical track records .62 Figure 29 Sector arrangement on hel
30、ical tracks for 525/60 and 625/50 systems .63 Figure 30 Sync block format64 Figure 31 Track, segment and field numbers .64 Figure 32 Analogue to digital timing relationship (525/60 system).65 Figure 33 Analogue to digital timing relationship (625/50 system).65 Figure 34 Digital vertical blanking (52
31、5/60 system) 66 Figure 35 Digital vertical blanking (625/50 system) 66 Figure 36 Shuffling (sector distribution) .67 Page4 EN61904:2000 BSI 06-2001 Page Figure 37 Structure of VLC group68 Figure 38 Structure of coefficient clusters68 Figure 39 Sync blocks construction .69 Figure 40 Video block inter
32、leave for 525/60 system .70 Figure 41 Video block interleave for 625/50 system .71 Figure 42 Audio video timing.72 Figure 43 Audio data word assignment72 Figure 44 Ancillary data 72 Figure 45 Data word allocation72 Figure 46 Intra-field shuffling for 525/60 system 73 Figure 47 Block shuffling for 52
33、5/60 system.73 Figure 48 Intra-field shuffling for 625/50 system 74 Figure 49 Block shuffling for 625/50 system.74 Figure 50 Channel sector shuffling 75 Figure 51 Recorded control code waveform for 525/60 system.76 Figure 52 Recorded control code waveform for 625/50 system.76 Figure A.1 Possible sca
34、nner configuration (525/60 system)78 Figure A.2 Possible scanner configuration (625/50 system)79 Figure A.3 Possible longitudinal head location and tape wrap (525/60 system).80 Figure A.4 Possible longitudinal head location and tape wrap (625/50 system).81 Table 1 Tape length and play time 9 Table 2
35、 Record location and dimensions for 525/60 and 625/50 systems .13 Table 3 ID0 Sync block number15 Table 4 Sector offset for 525/60 and 625/50 systems .20 Table 5 Quantization 22 Table 6 Category conversion24 Table 7 VLC for luminance component.25 Table 8 VLC for chrominance components .27 Table A.1
36、Parameters for a possible scanner design 77 Table A.2 Data rate and wavelength.77 Table B.1 Comparison of digital-L/analogue type-L recording parameters 82 Page5 EN61904:2000 BSI 06-2001 VIDEO RECORDING HELICAL-SCAN DIGITAL COMPONENT VIDEO CASSETTE RECORDING FORMAT USING 12,65 mm MAGNETIC TAPE AND I
37、NCORPORATING DATA COMPRESSION (FORMAT DIGITAL-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. The video data are re
38、corded 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 interchangeability of
39、 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 apply. However, pa
40、rties 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 of IEC and ISO mai
41、ntain registers of currently valid International Standards. IEC 60461:1986, Time and control code for video tape recorders IEC 60958:1989, Digital audio interface IEC 61213:1993, Analogue audio recording on video tape Polarity of magnetization IEC 61237-1:1994, Broadcast video tape recorders Methods
42、 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 ITU-R Recommendation BT.656-
43、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 digital audio recorders Page6 EN
44、61904:2000 BSI 06-2001 1.3 Abbreviations 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 1.4 Environment and test condition
45、s Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditions: temperature: 20 C 1 C; relative humidity: 50 % 2 %; barometric pressure: from 86 kPa to 106 kPa; tape tension: 0,3 N 0,05 N; tape conditioning: not less than 24
46、 h. 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 Purpose C2B-DB mechanical alignment C2A-DB electrical alignment 1.6 Calibration tape Manufacturers of video tape recorders d
47、esigned 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 named. Equivalent products may be used if they can b
48、e shown to lead to the same results. 1.6.1 Record locations and dimensions Tolerance shown in table 2 should be reduced by 50 %. Page7 EN61904:2000 BSI 06-2001 1.6.2 Calibration tape for mechanical alignment This tape is used for the purpose of aligning positions of stationary heads and rotary heads
49、. Test signals Video/audio ch A/C - 4 MHz/16 MHz/50 % flat field ch B/D - 8 MHz/16 MHz/50 % flat field Cue track 1 kHz 0 VU 12 kHz 0 VU Time code track 25 Hz (7:3 duty rectangle) Control track 50 Hz 1.6.3 Calibration tape for electrical alignment of recorders This tape is used for RF, digital video, digital audio and cue alignment
