1、BRITISH STANDARD BS EN 60961:1994 IEC961:1993 Specification for Helical-scan video tape cassette system using12.65mm(0.5in) magnetic tape on typeL The European Standard EN60961:1994 has the status of a BritishStandard UDC 621.397.454BSEN60961:1994 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 15July1994 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft for comment89/25034 DC ISBN 0 580
3、23392 8 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 UnitedKingdom Amendments issued since publication Amd. No. Date CommentsBSEN60961:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 60961 5 National annex NA (in
5、formative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN60961:1994 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 EN60961:1994 Helical-scan video tape cassette system using12,65mm (0,5in) magnetic tape on typeL, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC961:1993 published by the International Electrotechnical Commission (IEC).
7、This standard supersedes BS7260:1989, which is withdrawn. Copies of CCIR documents may be purchased from Customer Services, Publications, BSI, Linford Wood, Milton Keynes MK146LE. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards ar
8、e 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 to64, an inside back cover and a back cover
9、. 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 EN60961 February1994 UDC 621.397.454 Descriptors: Electroacoustics, electroacousti
10、c equipment, video recording, magnetic recording, video tape recorders, magnetic tapes, cassette for magnetic tapes, recording characteristics, mechanical properties, electrical properties, dimensions English version Helical-scan video tape cassette system using12,65mm (0,5in) magnetic tape on typeL
11、 (IEC961:1993) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de12,65mm(0,5in) de formatL (CEI961:1993) Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband 12,65mm(0,5in) L-Format (IEC961:1993) This European Standard was approved by CENELEC on1993-12-08.
12、 CENELEC members are bound to comply 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
13、 on application to the Central Secretariat 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
14、Secretariat has the same status as 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 UnitedKingdom. CEN
15、ELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN60961:1994EEN60961:1994 BSI 01-
16、2000 2 Foreword The text of document60B(CO)152, as prepared by Subcommittee60B: Video recording of IEC Technical Committee60: Recording, was submitted to the IEC-CENELEC parallel vote in April1993. The reference document was approved by CENELEC as EN60961 on8 December1993. The following dates were f
17、ixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A and Annex B are informative and Annex ZA is normative. Contents Page Foreword 2 Section 1. General 1 Scope 5 2 Normative references 5
18、3 Environment and test conditions 5 3.1 Environment 5 3.2 Reference tape 5 3.3 Calibration tape 5 Section 2. Video tape and video tape cassette Section 3. Video cassette recorders 4 Definitions of terms 6 4.1 Scanner 6 4.2 Drum 6 4.3 Upper drum 6 4.4 Lower drum 6 4.5 Effective drum diameter 7 4.6 He
19、lix angle 7 4.7 Track angle 7 4.8 Centre span tension 7 4.9 Wrap angle 7 4.10 Lead signal overlap 7 5 Scanner pole-tips 7 5.1 Pole-tip projection 7 5.2 Luminance pole-tips 7 5.3 Colour-recording pole-tips 7 5.4 Erase pole-tips 7 5.5 Channel identification 7 6 Helix angle 8 7 Drum diameter and tape t
20、ension 8 7.1 Actual upper drum diameter 8 7.2 Actual lower drum diameter 8 7.3 Upper drum 8 7.4 Centre span tension 8 8 Dimensions and location of records 8 8.1 Test environment 8 8.2 Tape speed 8 8.3 Recording locations and dimensions 8 8.4 Curvature of video recordings 9 8.5 Relative positions of
21、recorded signals 9 8.6 Gap azimuth 9 9 Luminance and colour-recording system 9 10 Recording characteristics 9 latest date of publication ofan identical national standard (dop)1994-12-01 latest date of withdrawal ofconflicting national standards (dow)1994-12-01EN60961:1994 BSI 01-2000 3 Page Section
22、4. Recording characteristics 11 Video recording 9 11.1 Luminance channel 9 11.2 Chrominance channel 11 11.3 Decoding and colour-field identification 13 12 Longitudinal audio signal recording (channels1 and2) 13 12.1 Reference levels 13 12.2 Frequency response 13 12.3 Track usage 14 13 FM audio signa
23、l recording (channels3 and4) 15 13.1 Signal processing 15 13.2 Reference levels 15 13.3 Noise reduction 15 13.4 Frequency modulation 15 13.5 Recording current 16 13.6 Track usage 16 14 Time and control code recording 16 14.1 Designated track for time and control code 16 14.2 Recording method 16 15 T
24、racking control recording 16 15.1 Tracking control signal 16 15.2 Tracking control and video timing 16 15.3 Recording method 16 Section 5. Type-L format video tape and video tape cassette 16 Mechanical characteristics of video tape cassette 17 16.1 Cassette outside dimensions 17 16.2 Datum planes 17
25、 16.3 Window area and label area 17 16.4 Manufacturers identification holes 17 16.5 Safety tab and safety plug 17 16.6 Reel 18 16.7 Cassette lid 18 17 Magnetic tape 18 17.1 Type of magnetic tape 18 17.2 Tape width 18 17.3 Tape thickness and length 19 17.4 Coercivity 19 17.5 Transmissivity 19 17.6 Of
26、fset yield strength 19 17.7 Residual elongation 19 17.8 Magnetic orientation 19 Page 18 Leader tape/trailer tape 19 18.1 Mechanical characteristics 19 18.2 Leader tape and trailer tape dimensions 19 18.3 Offset yield strength 20 18.4 Splicing break strength 20 Annex A (informative) Cross tape track
27、measurement technique 60 Annex B (informative) Reference tapes 62 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 63 Figure 1 Top view of scanner pole-tips 22 Figure 2 Drum diameters and side view of scanner pole
28、-tips 23 Figure 3 Record locations and dimensions 24 Figure 4a Video record location (525 line-60 field) 25 Figure 4b Video record location (625 line-50 field) 25 Figure 5a Wave-form of modified luminance signal(525line-60 field) 26 Figure 5b Wave-form of modified luminance signal(625line-50 field)
29、27 Figure 6 Pre-emphasis network 28 Figure 7a Wave-form of compressed R-Y andB-Y signals (525 line-60 field) 29 Figure 7b Wave-form of compressed R-Y andB-Y signals (625 line-50 field) 30 Figure 8 Time compression and multiplexing system 31 Figure 9a Field identification signal (525 line-60 field) 3
30、1 Figure 9b Field identification signal (625 line-50 field) 32 Figure 10a Tracking control wave-form and timing (525 line-60 field) 32 Figure 10b Tracking control wave-form and timing (625 line-50 field) 33 Figure 11 Y and C track recording current 34 Figure 12 The LF amplitude of chrominance FM sig
31、nal 35 Figure 13a VISC signal (525 line-60 field) 36 Figure 13b VISC signal (625 line-50 field) 37 Figure 14 FM audio noise reduction system 38 Figure 15 FM audio noise reduction transient response characteristics 39EN60961:1994 BSI 01-2000 4 Page Figure 16 Appearance of video cassette Top and side
32、view 40 Figure 17 Appearance of video cassette Bottom view 41 Figure 18a Datum spots and supported areas 42 Figure 18b Tape guide 43 Figure 19 Location of cassette reels in the recorder and/or player 44 Figure 20 Protecting lid of cassette 45 Figure 21 Cassette reel 46 Figure 22 Relationship between
33、 reels and reel spindles 47 Figure 23 Allowable and operating ranges for unlocking the lever of cassette lid 48 Figure 24 Force needed to open the lid 49 Figure 25 Appearance of video cassette Top and side view 50 Figure 26 Appearance of video cassette Bottom view 51 Figure 27a Datum spots and suppo
34、rted areas 52 Figure 27b Tape guide 53 Figure 28 Location of cassette reels in the recorder and/or player 54 Figure 29 Protecting lid of cassette 55 Figure 30 Cassette reel 56 Figure 31 Relationship between reels and reel spindles 57 Figure 32 Allowable and operating ranges for unlocking the lever o
35、f cassette lid 58 Figure 33 Force needed to open the lid 59 Table 1 Detail enhancement output (dB) 10 Table 2 Amplitude clipping (luminance) 10 Table 3 Recorded carrier frequency (luminance) 11 Table 4 Amplitude clipping (chrominance) 12 Table 5 Recorded carrier frequency (chrominance) 12 Table 6 Au
36、dio noise reduction encoding characteristics (dB) 14 Table 7 Record locations and dimensions 21EN60961:1994 BSI 01-2000 5 Section 1. General 1 Scope This International Standard applies to magnetic video recording and/or reproduction using12,65mm(0,5in) tape cassettes on helical-scan video cassette r
37、ecorders suitable for broadcast applications. This standard specifies two recording modes. MODE I uses oxide particle tape, MODE II uses metal particle tape and permits frequency modulated (FM) audio signals to be recorded. The standard defines the electrical and mechanical characteristics of equipm
38、ent which will provide for interchangeability of recorded cassettes. The requirements given are related to525line-60 field and/or625line-50 field systems. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this
39、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 the most recent editions of the normative d
40、ocuments 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. IEC268-17:1990, Sound system equipment Part17: Standard volume indicators. I
41、EC461:1986, Time and control code for video tape recorders. IEC767:1983, Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type beta format. CCIR Report624-4, Characteristics of television systems. 3 Environment and test conditions 3.1 Environment Test and measurement made
42、 on the system to check the requirements of this standard shall be carried out under the following conditions. 3.2 Reference tape Blank tape to be used for reference recordings may be purchased from the manufacturers listed in Annex B. The electromagnetic compatibility parameters and their specifica
43、tions should be specified by the manufacturers and controlled accordingly. Model name: a) IECL-format reference tape for MODE I; b) IECL-format reference tape for MODE II. Electromagnetic compatibility parameters and their specifications are indicated in Annex B. 3.3 Calibration tape Calibration tap
44、es which have satisfied the following requirements will be available from manufacturers of video tape recorders and players in accordance with this format specification. Temperature (drum diameter): 20 C 0,5 C Temperature (all other tests): 20 C 1 C Relative humidity: 48%to52% Barometric pressure: 8
45、6kPa to106kPa Conditioning before testing: 24hEN60961:1994 6 BSI 01-2000 3.3.1 Record locations and dimensions For calibration tapes intended for the purpose of calibrating the mechanical accuracy of the recorder or player, in accordance with this format specification, a50%reduction in the tolerance
46、s shown in Table 7 should, in general, be applied. If necessary, the record locations and dimensions can be specially modified for certain calibration tapes in order to avoid calibration error or to aid calibration. 3.3.2 Calibration signals Two classes of signals should be recorded on the calibrati
47、on tapes: a) a series of conventional test signals for analogue component video tape recorders b) special test signals developed by each manufacturer for product alignment. These signals are not universally applicable to all manufacturers products, and will not be specified. Section 2. Video tape an
48、d video tape cassette This video tape recording system specifies the use of video tape and video tape cassette in the BETA-format as delineated in sections2 and4 of IEC767 or the use of video tape and video tape cassette in the type-L format as delineated in section5 of this standard, which is newly
49、 specified to provide all-inclusive specifications of video tape and video tape cassette for MODE II recordings and/or long-playing operations including current video tape and video tape cassette (see16.1 through18.4 of this standard). Section 3. Video cassette recorders 4 Definitions of terms The following definitions are given to assist in the correct understanding of this International Standard. 4.1 scanner the mechanical assembly containing a
