1、EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61118 October 1993 LDC 621.397.454 Descriptors: Magnetic recording, video recording, audio recording, recording apparatus, video tape recorders, magnetic tapes cassettes, dimensions, recording characteristics, interchangeability English version He
2、lical-scan video tape cassette using 12,65 mm (0,5 in) magnetic tape - Type M2 (IEC 1118 : 1993) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de 12,65 mm (0,5 in) de type M2 (CE1 1118 : 1993) Videoband-Kassettensystem mit Schrgspuraufzeichnung auf Magnetband 12,65 mm
3、 (0,5 in) Typ M2 (IEC 1118 : 1993) This European Standard was approved by CENELEC on 1993-09-22. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up
4、-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 Standard exists in three official versions (English, French, German). A version in any other language made by translation
5、 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 national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Ita
6、ly, Luxembourg, 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-10
7、50 Brussels 0 1993 Copyright reserved to CENELEC members Ref. No. EN 61118 : 1993 E 3404583 0089626 BTB 0 Page 2 EN 61118 : 1993 Foreword The text of document 60B(C0)135, as prepared by Subcommittee 6OB: Video recording, of IEC %chnical Committee 60: Recording, was submitted to the IEC-CENELEC paral
8、lel vote in May 1992. “he reference document was approved by CENELEC as EN 61118 on 22 September 1993. The following dates were fixed: - latest date of publication of an identical national standard (dp) 1994-07-01 - latest date of withdrawal of conflicting national standards (dow) 1994-07-01 Annexes
9、 designated normative 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. Page 3 EN 61118 : 1993 CONTENTS clauce 1 1 1.2 1.3 2.1 3.1 3.2 3.3 . Page SECTION 1 : GENERAL Scope Normative
10、 references Environment and test conditions . 1.3.1 Environment 1.3.2 Reference tape . 1.3.3 Calibration tape SECTION 2: VIDEO TAPE CASSETTE Mechanical parameters . 2.1.1 Cassette type 2.1.2 Dimensions of cassettes . 2.1.3 Cassette dimension datum system 2.1.4 Window and label-pasting faces 2.1.5 Id
11、entification holes . 2.1.6 Dimensions of reels . 2.1.7 Tape windings 2.1.9 Opening of lid . 2.1.10 Releasing of reel brake 2.1.11 Automatic stop 2.1.8 Unlocking of lid . SECTION 3: VIDEO CASSETTE RECORDERS Definitions . i . 3.1.1 Scanner . 3.1.2 Drum 3.1.3 Upper drum . 3.1.4 Lower drum . 3.1.5 Effec
12、tive drum diameter 3.1.6 Helix angle . ; 3.1.7 Track angle . Drum diameter and structure 3.2.1 Actual upper drum diameter . 3.2.2 Actual lower drum diameter 3.2.3 Upper drum section . Scanner pole tips . ; 3.3.1 Pole tip projection 3.3.2 Pole tips : 3.3.3 Chordal distance between luminance and chrom
13、inance pole tips . . 6 6 6 6 7 7 8 8 8 8 8 9 10 10 10 10 10 10 10 10 10 10 11 11 11 11 11 11 11 11 11 11 12 12 Page 4 EN 61118 : 1993 3.4 3.5 3.6 4.1 4.2 4.3 5.1 5.2 5.3 Clause 3.3.4 Axial distance between luminance and chrominance pole tips . 3.3.5 Channel identification Dimensions and locations of
14、 records 3.5.1 Test environment . 3.5.2 Tape speed . 3.5.3 Record locations and dimensions 3.5.4 Video record curvature 3.5.5 Gap azimuth . Recording characteristics . Helix angle SECTION 4: TAPE CHARACTERISTICS Dimensions of video tape . 4.1.1 Magnetic tape thickness . 4.1.2 Magnetic tape width . M
15、agnetic tape properties 4.2.1 Type of magnetic tape . 4.2.2 Magnetic orientation 4.2.3 Coercivity Leader tape and trailer tape . 4.3.1 Automatic stop 4.3.2 Dimensions of leader and trailer tape . 4.3.3 Splicing SECTION 5: RECORDING CHARACTERISTICS Video signal recording 5.1.1 Luminance channel 5.1.2
16、 Chrominance channel 5.1.4 Vertical interval subcarrier (VISC) . Longitudinal audio signal recording 5.2.1 Recording method 5.2.3 Frequency characteristics . 5.2.4 Track usage (common audio mode) 5.2.5 Program audio head phasing . 5.2.6 Recording polarity FM audio signal recording (optional) 5.3.1 R
17、ecording/Reproducing reference levels 5.3.2 Noise reduction 5.3.3 Pre-emphasis 5.3.4 Frequency modulation . 5.3.5 Recording head current . 5.3.6 Recording polarity 5.1.3 Y-C timing . . 5.2.2 Recording/Reproducing reference levels Page 12 12 12 12 12 13 13 13 13 13 15 15 15 15 15 15 15 15 15 15 15 16
18、 16 19 22 22 23 23 23 23 24 25 25 25 25 25 26 26 26 26 9 3404583 0087b29 507 9 Page 5 EN 61118 : 1993 5.4 Time and control code signal recording 5.4.1 Time and control code . 5.42 Recording track 5i4.3 Recording method 5.4.4 Recording level Tracking control signal recording 5.5 5.5.1 Recording track
19、 5.5.2 Recording waveform and level . 5.5.3 Polarity of remanent magnetization . 5.5.4 Timing and period 5.5.5 Coiour framing information . 5.5.6 Magnetization level 5.5.7 Rise time . 5.6 PCM audio recording (PCM audio mode) . 5.6.1 Source coding . 5.6.2 Signal processing . 26 26 26 27 27 27 27 27 2
20、7 27 27 27 27 28 28 29 Figures 38 Annexes A(informative) Reference tape 85 ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 86 m 3404553 0089630 229 m Page 6 EN 61118 : 1993 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING
21、 12,65 mm (0,5 in) MAGNETIC TAPE - TYPE M2 SECTION 1: GENERAL 1.1 Scope This International Standard is applicable to magnetic video recording using 12.65 mm (0,5 in) tape cassettes on helical-scan video tape recorders and defines the basic M2 format video cassette system. This standard also specifie
22、s 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 dimensions and other characteristics of
23、equipment which are necessary to ensure the interchangeability of recorded cassettes. The requirements given relate to 525 line-60 field and 625 line-50 field systems. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute prov
24、isions of this International Standard. At the time of publication, the edi- tions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possi- bility of applying the most recent editions
25、 of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 94-1 : 1981, Magnetic tape sound recording and reproducing systems - Part 1: General conditions and requirements. IEC 461 : 1986, Time and control code for video tap
26、e recorders. EBU R-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 Inter- national Standard shall be made under
27、the following conditions unless otherwise specified: Temperature (drum diameter): Temperature (all other tests): Relative humidity: Barometric pressure: Conditioning before testing: 20 “C f 0,5 OC 20 “C f 1 “C 50% f2% 86 kPa to 106 kPa 24 h Page 7 EN 61118 : 1993 1.3.2 Reference tape Blank tape to b
28、e 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 controlled accordingly. Electromagnetic compatibility parameters and their specifications are indica
29、ted 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 specifi- cat ion. 1.3.3.1 Record locations and dimensions In principle, 50 % reduction i
30、n the tolerances shown in table 1 shall be applied to calibra- tion tapes to be used for the purpose of calibrating the mechanical accuracy of recorders or players in accordance with this format specification. If necessary, the record locations and dimensions may be specially modified for some calib
31、ration tapes in order to avoid certain calibration errors or to facilitate certain calibration work. 1.3.3.2 Calibration signals Two classes of signals shall be recorded on the calibration tapes: a) A series of conventional analogue component test signals for video tape recorders. Video - Colour bar
32、s - Multi-burst - Bowtie - Pulse and bar Audio - 1kHz-OVU - 15kHz-OVU - 20or40Hz-lOVU . - 1 kHZ-10VU - - 10kH-10VU - 15kHZ-IOVU 7.5 kHt - 10 VU AFM = - 1 kHz, 70 kHz deviation. 3404583 0087632 OT1 Page 8 EN 61118 : 1993 b) Special test signals developed by each manufacturer for product alignment. Th
33、ese signals are not universally applicable to the products from each manufacturer and are not specified in this International Standard. SECTION 2: VIDEO TAPE CASSETTE 2.1 Mechanical parameters 2.1.1 Cassette type There are two cassette types, characterized by the outside dimensions shown below: - la
34、rge cassette:, - small cassette: 106 mm x 188 mm x 25 mm 87 mm x 130 mm x 25 mm 2.1.2 Dimensions of cassettes The dimensions permitting the interchangeability of cassettes shall be in accordance with figures 1 to 5 and figures 7 to 11. 2.1.3 Cassette dimension datum system 2.1.3.1 Datum holes These
35、shall be holes serving for the reference when loading a cassette into the video tape recorder, and shall also be the reference for the cassette dimensions (see figures 2, 4, 8 and 10). 2.1.3.2 Datum plane Z This shall be a plane containing three datum positions A, B and C on the bottom of the casset
36、te (see figures 4 and 10). 2.1.3.3 Datum plane X Large cassette: This shall be a plane orthogonal to datum plane 2 and containing the centre lines of datum holes A and 8 see figures 2 and 4). Small cassette: This shall be a plane parallel to the long side face of the cassette orthogonal to datum pla
37、ne 2 and containing the centre line of datum hole A (see figures 8 and IO). 2.1.3.4 Datum plane Y This shall be the plane orthogonal to both datum planes X and Z and containing the centre line of datum hole A (see figures 2, 4, 8 and IO). 2.1.4 Window and label-pasting faces Large cassettes shall co
38、nform to figure 1. Small cassettes shall conform to figure 7 Page 9 EN 61118 : 1993 2.1.5 Identification holes Various holes shall be provided for identifying cassette conditions (see figures 2 and 8). Each hole may be set in the closed state or the open state. Closed state: The hole depth shall be
39、O mm to 0,25 mm; be able to withstand the normal load of 03 N Open state: The hole diameter. shall be 3 :+;: mm; The hole depth shall be 5 mm or more. 2.1 51 Erasure prevention identification hole Large cassettes shall be defined by figure 2. Small cassettes shall be defined by figure 8. The erasure
40、 prevention identification hole shall be coupled to the erasure prevention mechanism shown in figure 1 and 7 and may be changed between the closed state and the open state. Each state shall be defined as follows: Identification hole closed: Ready to record. Identification hole open: Not ready to rec
41、ord. 2.1.5.2 Tape type identification hole Large cassettes shall be defined by figure 2. Small cassettes shall be defined by figure 8. The closed state of the identification hole shall be defined as follows: Identification hole closed: Metal tape. (Coercive force: approximately I 20 x 1 o3 Aim). 2.1
42、 53 Tape thickness identification hole Large cassettes shall be defined by figure 2. Small cassettes shall be defined by figure 8. The closed state of the identification hole shall be defined as follows: Identification hole closed: Tape total thickness is 133 pm f 03 pm. 2.1 54 Extra identification
43、holes These holes are provided for future usage. The positions of these holes shall be as shown below: Large cassettes shall be as defined in figure 2 (five holes). Small cassettes shall be as defined in figure 8 (two holes). E 3404583 0089634 974 lW Page 10 EN 61118 : 1993 2.1.6 Dimensions of reels
44、 Dimensions of the reels shall be in accordance with figure 5 and 11. 2.1.7 Tape windings The tape winding method and path shall be in accordance with figures 6 and 12. 2.1.8 Unlocking of lid The lid shall be unlocked when a force of not more than 0,15 N in the case of the large cassette, or a force
45、 of not more than 0,30 N in the case of the small cassette is applied to the unlocking clutch as indicated in note 8 of figure 1 and note 6 of figure 7. 2.1.9 Opening of lid The force necessary for opening the lid shall be not more than 1 N until the lid is opened to the maximum. 2.1 .l O The reel b
46、rakes shall be released by a force of not more than 0,7 N by means of a reel brake unlocking pin as shown in note 4 of figure 3 and note 3 of figure 9. Releasing of reel brake 2.1.1 1 Automatic stop At the end of the tape, transparent leader and trailer tapes are provided for either auto- matic shut
47、-off or automatic rewind. SECTION 3: VIDEO CASSETTE RECORDERS 3.1 Definitions For the purpose of this International Standard, the following definitions apply. 3.1.1 Scanner A mechanical assembly containing a drum, rotating pole tips and the tape-guiding elements used to record and reproduce video, F
48、M audio and PCM audio signals. 3.1.2 Drum A cylindrical column around which the tape is at least partially wrapped in order to form the head-to-tape interface of the video tape recording system. . 3.1.3 Upper drum That pari of the drum which does not contact the reference edge of the tape (see figur
49、e 14a). 3404583 0087635 800 Page 11 EN 61118 : 1993 3.1.4 Lower drum That part of the drum which contacts the reference edge of the tape and provides tape- guiding functions (see figure 14a). 3.1.5 Effective drum diameter The value of drum diameter which yields the actual video and PCM audio record dimen- sions in a theoretical calculation. This value is greater than or equal to the actual drum diameter. 3.1.6 Helix angle The angle formed between the path of the rotating heads and the tape reference edge guiding system. 3.1.7 Track angle The angle forme
