1、BRITISH SLANUAXCU Specification for Helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type L The European Standard EN 60961 : 1994 has the status of a British Standard Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de 12,ciFj mm (0,s in)
2、de format L Video-Bandkassettensystem mit Schrdgspuraufzichnung auf Magnetband 12.65 mm (0.5 in) L-Format BS EN 60961 : 1994 IEC 961 : 1993 3404583 0113432 348 M BS EN 60961 : lYY4 Amd. No. Date Co operating organizations Text affected The European Committee for Electrotechnical Standardization (CEN
3、ELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom This British St
4、andard, having been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards oard and comes into effect on 15 July 1994 O BSI 1994 The following BSI references relate to the work on this standard: Committee reference EEL/
5、22 Draft for comment 892.5034 LE ISBN O 580 23392 8 = 3404583 OLL3433 284 BS EN 60961 : 1994 Contents hge Cooperating organizations Inside front cover National foreword i Foreword 2 Text of EN 60961 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informa
6、tive) Cross-references Inside back cover National foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN 60961 : 1994 Helical-scan video tape cassette system using 12,65 mm (0,5 in) magneti
7、c tape on type L, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 961 : 1993 published by the International Electrotechnical Commission (IEC). This standard supersedes BS 7260 : 1989, which is withdrawn. Copies of CCIR documents may be pur
8、chased from Customer Services, Publications, BSI, Linford Wood, Milton Keynes MK14 6LE. Compliance with a British Standard does not of itself confer immunity from legal obligations. i O il il 3- m 3- m i) il O rn Q v) f O f m EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60961 February 1994 U
9、DC 62 1.397.454 Descriptois: Electroacoustics, electroacoustic equipment, video recording, magnetic recording, video tape recorders, magnetic tapes, casette for magnetic tapes, recording characteristics, mechanical properties, electrical properties, dimensions English version Helical-scan video tape
10、 cassette system using 12,65 mm (O$ in) magnetic tape on type L (IEC 961 : 1993) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de 12,65 mm (0,5 in) de format L (CE1 961 : 1993) Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband 12,65 mm (0,5 in) L-Form
11、at (IEC 961 : 1993) This European Standard was approved by CENELEC on 1993-12-08. CENELEC members are bound to comply with the CENXENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists a
12、nd bibliographical references concerning such national standards may be obtained 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 Linder the resp
13、onsibility 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 national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
14、 Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1
15、994 Copyright reserved to CENELEC members Ref. No. EN 60961 : 1994 E 3404583 OLL3435 057 Page 2 EN 60961: 1994 Foreword The text of document 60B(C0)152, as prepared by Subcommittee 60B: Video recording of IEC Technical Committee 60: Recording, was submitted to the IEC-CENELEC parallel vote in April
16、1993. The reference document was approved by CENELEC as EN 60961 on 8 December 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-12-01 - latest date of withdrawal of conflicting national standards (dow) 1994-12-01 Annexes designated norma
17、tive are part of the body of the standard. Annexes designated informative are given only for information. In this standard, annexes A and B are informative and annex ZA is normative. 3404583 OLL3436 T3 = Page 3 EN 60961 : 1994 CONTENTS clause SECTION ONE: GENERAL Scope Normative references . Environ
18、ment and test conditions 3.1 Environment 3.2 Reference tape 3.3 Calibration tape . SECTION TWO: VIDEO TAPE AND VIDEO TAPE CASSETTE SECTION THREE: VIDEO CASSETTE RECORDERS Definitions of terms 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 Scanner Drum . Upper drum Lower drum Effective drum diameter . Heli
19、x angle . Track angle Centre span tension . Wrap angle . Lead signal overlap . Scanner pole-tips 5.1 Pole-tip projection . 5.2 Luminance pole-tips . 5.3 Colour-recording pole-tips . 5.4 Erase pole-tips 5.5 Channel identification . Helix angle . Drum diameter and tape tension 7.1 Actual upper dNm dia
20、meter 7.2 Actual lower drum diameter . 7.3 Upper drum 6 6 6 6 7 7 8 8 8 8 8 8 9 9 9 9 9 9 9 9 9 10 10 10 10 1.0 10 10 7.4 Centre span tension . 11 . 3404583 0333437 92T Page 4 EN 60961 : 1994 CbW 8 9 10 11 12 13 14 15 16 Dimensions and location of records . 8.1 Test environment 8.2 Tape speed 8.3 Re
21、cording locations and dimensions 8.4 Curvature of video recordings . 8.5 Relative positions of recorded signals . Luminance and colour-recording system . 8.6 Gap azimuth Recording characteristics SECTION FOUR: RECORDING CHARACTERISTICS Video recording . 11.1 Luminance channel 11.2 Chrominance channe
22、l 11 -3 Decoding and colour-field identification Longitudinal audio signal recording (channels 1 and 2) 12.1 Reference levels . 12.2 Frequency response 12.3 Track usage FM audio signal recording (channels 3 and 4) . 13.1 Signal processing . 13.2 Reference levels . 13.3 Noise reduction . 13.4 Frequen
23、cy modulation . 13.5 Recording current . 13.6 Track usage Time and control code recording 14.1 Designated track for time and control code 14.2 Recording method Tracking control recording . 15.1 Tracking control signal . 15.2 Tracking control and video timing 15.3 Recording method SECTION FIVE: TYPE4
24、 FORMAT VIDEO TAPE AND VIDEO TAPE CASSETTE Mechanical characteristics of video tape cassette . 16.1 Cassette outside dimensions . 16.2 Datum planes . page 11 11 11 11 11 12 12 12 12 12 13 16 18 19 19 19 20 21 21 21 22 22 22 23 23 23 23 23 23 24 24 24 24 24 3404583 0333438 866 Page 5 EN 60961 : 1994
25、ClRuSe 17 18 16.3 Window area and label area . 16.4 Manufacturers identification holes 16.5 Safety tab and safety plug 16.6 Reel 16.7 Cassette lid . Magnetic tape 17.1 Type of magnetic tape . 17.2 Tape width . 17.3 Tape thickness and length 17.4 Coercivity . 17.5 Transmissivity . 17.6 Offset yield s
26、trength . 17.7 Residual elongation . 17.8 Magnetic orientation . Leader tapeltrailer tape . 18.1 Mechanical characteristics 18.2 Leader tape and trailer tape dimensions . 18.3 Offset yield strength . 18.4 Splicing break strength Figures Annexes A Cross tape track measurement technique B Reference ta
27、pes ZA (normative) Other international publications quoted in this standard with page 24 24 25 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 31 68 70 the references of the relevant European publications . 71 m 3404583 OLL3Y39 7T2 Page 6 EN 60961 : 1994 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING
28、 12,65 mm (0,5 in) MAGNETIC TAPE ON TYPE L SECTION ONE: GENERAL 1 Scope This International Standard applies to magnetic video recording and/or reproduction using 12,65 mm (0.5 in) tape cassettes on helical-scan video cassette recorders suitable for broadcast applications. This standard specifies two
29、 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 equipment which will provide for interchangeability of recorded cassettes. The
30、requirements given are related to 525 line-60 field andor 625 line-50 field systems. 2 Normative references lhe following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indic
31、ated were valid. All normative documents are subject to revision, and parties to agreements based on this Intemational Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of
32、currently valid International Standards. IEC 94-1: 1981, Magnetic tape sound recording and reproducing systems - Patt 1: General conditions and requirements IEC 268-1 7: 1990, Sound system equipment - Patt 17: Standard volume indicators IEC 461 : 1986, Time and control code for video tape recorders
33、IEC 767: 1983, Helical-scan video tape cassette system using 12,65 mm (0,s in) magnetic tape on type beta format CCIR Report 624-4: Characteristics of television systems 3 Environment and test conditlons 3.1 Environment Test and measurement made on the system to check the requirements of this standa
34、rd shall be carried out under the following conditions. , = 3404583 0333440 434 = Page 7 EN 60961 : 1994 Temperature (drum diameter): Temperature (all other tests): Relative humidity: Barometric pressure: Conditioning before testing: 20C i0.5“C 20 “C i 1 “C 48 Oh to 52 Yo 86 kPa to 106 kPa 24 h 3.2
35、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 specifications should be specified by the manufacturers and controlled accordingly. Model name: a) IEC L-format reference ta
36、pe for MODE I; b) IEC L-format reference tape for MODE Il. Electromagnetic compatibility parameters and their specifications are indicated in annex B. 3.3 Calibration tape Calibration tapes which have satisfied the following requirements will be available from manufacturers of video tape recorders a
37、nd players in accordance with this format specifi- cation. 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, a 50 Y reduction in the tolerances shown in
38、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 calibration tapes: a
39、) a series of conventional test signals for analogue component video tape recorders Video - Colour bars (75 To or 100 Yo) - Multi-burst - Bow-tie (50 Yo) - Pulse and bar FM audio - 400 Hz, 25 kHz deviation - 400 Hz, 75 kHz deviation Longitudinal audio - 1 kHZ O VU - 15 kHz or 10 kHr O VU - 40H -2OVU
40、 - 1 kHZ -2OVU - 7kHz -2OVU -10 kHZ -20 VU - 15 kHZ -20 VU 3404583 OLL3441 350 Page 8 EN 60961 : 1994 b) special test signais developed by each manufacturer for product alignment. These signals are not universally applicable to all manufacturers products, and will not be specified. SECTION TWO: VIDE
41、O TAPE AND 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 sections two and four of IEC 767 or the use of video tape and video tape cassette in the type-L format as delineated in section five of this sta
42、ndard, which is newly 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 (see 16.1 through 18.4 of this standard). SECTION THREE: VIDEO CASSETTE RECORDERS 4
43、 Definitions of terms The following definitions are given to assist in the correct understanding of this Inter- national Standard. 4.1 Scanner The mechanical assembly containing a drum, rotating pole-tips and tape-guiding elements. It is used to record and reproduce video tape recordings. 4.2 Drum T
44、he circular cylinder around which tape is at least partially wrapped in order to form the head-to-tape interface of a video tape recording system. 4.3 Upper drum That part of the drum in a helical-scan video recording system which does not come into contact with the reference edge of the tape. 4.4 L
45、ower drum That part of the drum in a helical-scan video recording system which comes into contact with the reference edge of the tape and usually contains tape-guiding elements. 4.5 Effective drum diameter The value of drum diameter which, when used in theoretical calculations, will correspond to th
46、e actual video record produced in a helical-scan video tape recording system. The effective value is equal to or greater than the actual diameter. 3404583 OLL3442 297 W Page 9 EN 60961 : 1994 4.6 Helix angle The angle formed between the path of the rotating pole-tips and the tape-reference-edge guid
47、ing system on the scanner of a helical-scan video tape recording system. 4.7 Track angle The angle of the recorded video track with respect to the reference edge of the tape in a helical video tape recording. 4.8 Centre span tension The calculated value of tape tension at a point midway between tape
48、 entrance and exit guides of the scanner in a video tape recording system. 4.9 Wrap angle The angle at the centre of the drum rotation subtended by the line of contact between the drum and the reference edge of the tape. 4.1 O Lead signal overlap That portion of the helical record which is required
49、to provide a duplicate (overlap) recording. 5 Scanner pole-tips There shall be four circumferential pole-tip locations as shown in figure 1 (top view). 5.1 Pole-tip projection Each pole-tip projection shall be radially 0.04 -0;:; mm, measured from the outer surface of the upper drum to the end of the pole-tip. 5.2 Luminance pole-tips Two pole-tips circumferentially spaced at 180“ f 0.003“ shall be provided for recording the luminance signal. 5.3 Colour-recording pole-tips Each luminance pole-tip shall have associated with it a pole-tip for recor
