1、BRITISH STANDARD BS EN 61118:1994 IEC1118:1993 Specification for Helical-scan video tape cassette system using12.65mm(0.5in) magnetic tape TypeM2 The European Standard EN61118:1993 has the status of a BritishStandard UDC 621.397.454BSEN61118:1994 This BritishStandard, having been prepared under the
2、directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comesintoeffect on 15January1994 BSI01-2000 The following BSI references relate to the work on this standard: Committee referenceEEL/22 Draft for comment89/25033DC ISBN 0 580
3、22687 5 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway Fran
4、ce Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN61118:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN61118 5 National annex NA (in
5、formative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN61118:1994 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English l
6、anguage version of EN61118:1993 Helical-scan video tape cassette using12,65mm(0,5in) magnetic tape TypeM2, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1118:1993, published by the International Electrotechnical Commission (IEC). Copies o
7、f EBU documents may be purchased from: Technical Centre of the European Broadcasting Union Cas Postale67 CH1218 Grand-Saconnex Geneva Switzerland Telephone:+41(22)7172111 or+41(22)7880481 Telefax:+41(22)7985897 A British Standard does not purport to include all the necessary provisions of a contract
8、. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to74, an ins
9、ide back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61118 October1993 UDC 621.397.454 Descriptors: Ma
10、gnetic recording, video recording, audio recording, recording apparatus, video tape recorders, magnetic tapes cassettes, dimensions, recording characteristics, interchangeability English version Helical-scan video tape cassette using12,65mm(0,5in) magnetic tape Type M2 (IEC1118:1993) Systme de magnt
11、oscope cassette balayagehlicodal utilisant la bande magntique de12,65mm(0,5in) de type M2 (CEI1118:1993) Videoband-Kassettensystem mit Schrgspuraufzeichnung auf Magnetband12,65mm(0,5in)Typ M2 (IEC1118:1993) This European Standard was approved by CENELEC on1993-09-22. CENELEC members are bound to com
12、ply with the CEN/CENELEC 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 Se
13、cretariat or to any CENELEC 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 a
14、s the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Elec
15、trotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN61118:1993EEN61118:1993 BSI 01-2000 2 Foreword The text of docu
16、ment60B(CO)135, as prepared by Subcommittee60B: Video recording, of IEC Technical Committee60: Recording, was submitted to the IEC-CENELEC parallel vote in May1992. The reference document was approved by CENELEC as EN61118 on22September1993. The following dates were fixed: Annexes designated “normat
17、ive” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A is informative and Annex ZA is normative. Contents Page Foreword 2 Section 1. General 1.1 Scope 5 1.2 Normative references 5 1.3 Environment and test conditions 5 1.3
18、.1 Environment 5 1.3.2 Reference tape 5 1.3.3 Calibration tape 5 Section 2. Video tape cassette 2.1 Mechanical parameters 6 2.1.1 Cassette type 6 2.1.2 Dimensions of cassettes 6 2.1.3 Cassette dimension datum system 6 2.1.4 Window and label-pasting faces 6 2.1.5 Identification holes 7 2.1.6 Dimensio
19、ns of reels 7 2.1.7 Tape windings 7 2.1.8 Unlocking of lid 7 2.1.9 Opening of lid 7 2.1.10 Releasing of reel brake 7 2.1.11 Automatic stop 7 Section 3. Video cassette recorders 3.1 Definitions 8 3.1.1 Scanner 8 3.1.2 Drum 8 3.1.3 Upper drum 8 3.1.4 Lower drum 8 3.1.5 Effective drum diameter 8 3.1.6
20、Helix angle 8 3.1.7 Track angle 8 3.2 Drum diameter and structure 8 3.2.1 Actual upper drum diameter 8 3.2.2 Actual lower drum diameter 8 3.2.3 Upper drum section 8 3.3 Scanner pole tips 8 3.3.1 Pole tip projection 8 3.3.2 Pole tips 9 3.3.3 Chordal distance between luminance and chrominance pole tip
21、s 9 3.3.4 Axial distance between luminance and chrominance pole tips 9 3.3.5 Channel identification 9 3.4 Helix angle 9 3.5 Dimensions and locations of records 9 latest date of publication ofan identical national standard (dop)1994-07-01 latest date of withdrawal ofconflicting national standards (do
22、w)1994-07-01EN61118:1993 BSI 01-2000 3 Page 3.5.1 Test environment 9 3.5.2 Tape speed 9 3.5.3 Record locations and dimensions 9 3.5.4 Video record curvature 9 3.5.5 Gap azimuth 10 3.6 Recording characteristics 10 Section 4. Tape characteristics 4.1 Dimensions of video tape 11 4.1.1 Magnetic tape thi
23、ckness 11 4.1.2 Magnetic tape width 11 4.2 Magnetic tape properties 11 4.2.1 Type of magnetic tape 11 4.2.2 Magnetic orientation 11 4.2.3 Coercivity 11 4.3 Leader tape and trailer tape 11 4.3.1 Automatic stop 11 4.3.2 Dimensions of leader and trailer tape 11 4.3.3 Splicing 11 Section 5. Recording ch
24、aracteristics 5.1 Video signal recording 11 5.1.1 Luminance channel 11 5.1.2 Chrominance channel 13 5.1.3 Y-C timing 15 5.1.4 Vertical interval subcarrier (VISC) 15 5.2 Longitudinal audio signal recording 15 5.2.1 Recording method 15 5.2.2 Recording/Reproducing reference levels 15 5.2.3 Frequency ch
25、aracteristics 16 5.2.4 Track usage (common audio mode) 16 5.2.5 Program audio head phasing 16 5.2.6 Recording polarity 17 5.3 FM audio signal recording (optional) 17 5.3.1 Recording/Reproducing reference levels 17 5.3.2 Noise reduction 17 5.3.3 Pre-emphasis 17 5.3.4 Frequency modulation 17 5.3.5 Rec
26、ording head current 17 5.3.6 Recording polarity 18 5.4 Time and control code signal recording 18 5.4.1 Time and control code 18 5.4.2 Recording track 18 5.4.3 Recording method 18 5.4.4 Recording level 18 5.5 Tracking control signal recording 18 5.5.1 Recording track 18 Page 5.5.2 Recording waveform
27、and level 18 5.5.3 Polarity of remanent magnetization 18 5.5.4 Timing and period 18 5.5.5 Colour framing information 18 5.5.6 Magnetization level 18 5.5.7 Rise time 18 5.6 PCM audio recording (PCM audio mode) 18 5.6.1 Source coding 19 5.6.2 Signal processing 19 Annex A (informative) Reference tape 7
28、4 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 74 Figure 1 Top and side views of the large cassette 27 Figure 2 Bottom view of the large cassette 29 Figure 3 Inner structure of the large cassette 31 Figure 4 Da
29、tum places and support surfacesofthe large cassette 32 Figure 5 Reel dimensions for the large cassette 33 Figure 6 Tape path in the large cassette 34 Figure 7 Top and side views of the small cassette 35 Figure 8 Bottom view of the small cassette 37 Figure 9 Inner structures of the small cassette 39
30、Figure 10 Datum places and supportingsurfacesof the small cassette 40 Figure 11a Supply reel dimensions for thesmallcassette 41 Figure 11b Take-up reel dimensions for thesmallcassette 42 Figure 12 Tape path in the small cassette 43 Figure 13 Top view of chrominance and luminance pole tips 44 Figure
31、14a Drum and tape path 44 Figure 14b Details of zone Z 45 Figure 15 Record locations and dimensions (Common audio mode) 45 Figure 16 Record locations and dimensions (PCMaudio mode) 46 Figure 17 Y and C video record locations for525line-60 field system 47 Figure 18 Y and C video record locations for6
32、25line-50 field system 48EN61118:1993 BSI 01-2000 4 Page Figure 19a Waveforms of burst mixed luminancesignal and burst and sync added chrominance signals(525line-60 field system) 49 Figure 19b Detail A of Figure 19a 50 Figure 19c Detail B of Figure 19a 51 Figure 19d Detail C of Figure 19a 52 Figure
33、19e Detail D of Figure 19a 52 Figure 20a Waveforms of burst mixed luminancesignal and burst and sync added chrominance signals(625line-50 field system) 53 Figure 20b Detail A of Figure 20a 54 Figure 20c Detail B of Figure 20a 55 Figure 20d Detail C of Figure 20a 56 Figure 20e Detail D of Figure 20a
34、56 Figure 21 Non-linear pre-emphasis circuit for525line-60 field system 57 Figure 22 Non-linear emphasis circuit for625line-50 field system 57 Figure 23 Luminance pre-emphasis network 57 Figure 24 Time-base compression and multiplexing 58 Figure 25 Chrominance pre-emphasis network 58 Figure 26 Refer
35、ence of Y C timing(525line-60field system) 59 Figure 27 Reference of Y C timing(625line-50 field system) 60 Figure 28 Waveforms of VISC signal(525line-60 field NTSC system) 61 Figure 29 Waveforms of VISC signal(625line-50 field PAL system) 62 Figure 30 Record equalization 63 Figure 31 Noise reductio
36、n circuit for FMaudiosignals 64 Figure 32 Audio pre-emphasis network 64 Figure 33 Control track signal waveformsandtiming 65 Figure 34 The waveforms and timing of thecontrol track signal with colour framing information for525line-60field NTSC system 65 Figure 35 The waveforms and timing of trackingc
37、ontrol signal for the625line-50 fieldPALsystem 66 Figure 36 The waveforms and timing of trackingcontrol signal for the625line-50 fieldSECAM system 67 Figure 37 Block diagram of PCM audio recordingsystem 68 Page Figure 38 Source data arrangement for No.4field(525line-60field system) 68 Figure 39 Sour
38、ce data arrangement for Nos.0to3 fields(525line-60field system) 68 Figure 40 Source data arrangement(625line-50field systems) 69 Figure 41 ID data content and reserved regionforfield address and emphasis(525line-60field systems) 69 Figure 42 ID data content and reservedregionforfield address and emp
39、hasis(625line-50field systems) 70 Figure 43 PCM signal format(525line-60fieldsystems) 70 Figure 44 PCM signal format(625line-50field systems) 71 Figure 45 PCM signal construction 71 Figure 46 Error correction format(525line-60field systems) 72 Figure 47 Error correction format(625line-50 field syste
40、ms) 72 Figure 48 Recording timing between twoaudiochannels 73 Figure 49 Recording video and audio timing 73 Table 1 Record locations and dimensions 10 Table 2 Frequency characteristics of non-linearemphasis 12 Table 3 Amplitude clipping levels 12 Table 4 Carrier frequencies corresponding toreference
41、 video levels (MHz) 13 Table 5 Frequency characteristics of non-linear emphasis 14 Table 6 Amplitude clipping level 14 Table 7 Carrier frequencies corresponding toreference video levels (MHz) 14 Table 8 Frequency characteristics of recordingcurrent 15 Table 9 Noise reduction characteristics 16 Table
42、 10 8-14 modulation 21 Table 11 Compensation code 26EN61118:1993 BSI 01-2000 5 Section 1. General 1.1 Scope This International Standard is applicable to magnetic video recording using12,65mm(0,5in) tape cassettes on helical-scan video tape recorders and defines the basic M2 format video cassette sys
43、tem. This standard also specifies two different audio recording modes: 1) common audio mode and 2) pulse code modulation audio mode. PCM audio mode has a limited interchangeability. FM audio recording shown in this standard is optional. The object of this International Standard is to define dimensio
44、ns and other characteristics of equipment which are necessary to ensure the interchangeability of recorded cassettes. The requirements given relate to525line-60field and625line-50field systems. 1.2 Normative references The following normative documents contain provisions which, through reference in
45、this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying th
46、e most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC94-1:1981, Magnetic tape sound recording and reproducing systems Part1: General conditions and requirements. IEC461:1986, Time and control code
47、for video tape recorders. EBUR-50:1989, Conservation of the polarity of audio signals in radio and television production installations. 1.3 Environment and test conditions 1.3.1 Environment Tests and measurements made on the system to check the requirements of this International Standard shall be ma
48、de under the following conditions unless otherwise specified: 1.3.2 Reference tape Blank tape to be used for reference recordings may be purchased from the manufacturers listed in Annex A. Electromagnetic compatibility parameters and their specifications shall be specified by the manufacturer and co
49、ntrolled accordingly. Electromagnetic compatibility parameters and their specifications are indicated in Annex A. 1.3.3 Calibration tape Calibration tapes satisfying the following requirements will be available for purchase from manufacturers of video tape recorders and players in accordance with this format specification. 1.3.3.1 Record locations and dimensions In principle,50% reduction in the tolerances shown in Ta
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