1、BRITISH STANDARD BS EN 60712:1996 IEC712:1993 (Including amendment1 May1993 to IEC712:1993) Helical-scan video-tape cassette system using19mm( in) magnetic tape, known as U-format The European Standard EN60712:1994 has the status of a BritishStandardBSEN60712:1996 This BritishStandard, having been p
2、repared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15April1996 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference ELP/60 Drafts for comment86/31040 DC and88/3441
3、6 DC ISBN 0 580 24963 8 Committees responsible for this British Standard The preparation of this BritishStandard was entrusted to Technical Committee ELP/60, Recording, upon which the following bodies were represented: Association of Professional Recording Services Limited Audio Engineering Society
4、British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Federation of the Electronics Industry ITV Association (ITVA) National Council for Educational Technology (NCET) Royal Photographic Society Royal Television Society Amendments issue
5、d since publication Amd. No. Date CommentsBSEN60712:1996 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN60712 5 List of references Inside back coverBSEN60712:1996 ii BSI 01-2000 National foreword This BritishStandard has been prepared
6、by Technical Committee EPL/60 and is the English language version of EN60712:1994 Helical-scan video-tape cassette system using19mm( in) magnetic tape, known as U-format, plus amendment A1:1994, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with
7、IEC712:1993, plus amendment1:1993, published by the International Electrotechnical Commission(IEC). This BritishStandard supersedes BS6370:1983 which iswithdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
8、 their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN60094 (IEC94) BS EN60094 Magnetic tape sound recording and reproducing systems HD507S1:1988 (IEC461:1986
9、) BS6865:1987 Specification for time control codes for video tape recorders Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to42, an inside back cover and a back cover. This standard has been updated (see copyright date) and may h
10、ave had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60712 September1994 +A1 September1994 ICS 33.160.40 Supersedes HD447S1:1984 Descriptors: Magnetic video recording, helical scanning, television
11、 recording and replay, cassettes, dimensions, requirements, properties English version Helical-scan video-tape cassette system using19mm( in) magnetic tape, known as U-format (includesamendmentA1:1994) (IEC712:1993 plus amendment1:1993) Systme cassette bande vido balayage hlicoidal utilisant la band
12、e magntique de19mm ( in), dappellation format-U (inclut lamendement A1:1994) (CEI712:1993 et lamendement1:1993) Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband19mm, bekannt als U-Format (enthlt nderung A1:1994) (IEC712:1993 und nderung1:1993) This European Standard and amendment A
13、1 were approved by CENELEC on1994-07-05. 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
14、 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 under the responsibility of a CENELEC member into its o
15、wn 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, Netherlands, Norway, Portugal, Spain, Sw
16、eden, 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 1994 Copyright reserved to CENELEC members R
17、ef. No. EN60712:1994/A1:1994 EEN60712:1994 BSI 01-2000 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC712:1993 could be accepted without textual changes, has shown that no common modifications were necessary for acceptance as a
18、European Standard. The reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as EN60712 on5July1994. This European Standard replaces HD447S1:1984. The following dates were fixed: Annexes designated ”normative“ are part of the body of the standard. In thi
19、s standard, Annex ZA is normative. Foreword to amendment A1 The CENELEC questionnaire procedure, performed for finding out whether or not amendment1:1993 to the International Standard IEC712:1993 could be accepted without textual changes, has shown that no common modifications were necessary for acc
20、eptance as a European Standard. The reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as amendment A1 to EN60712 on5July1994. The following dates were fixed: Contents Page Foreword 2 Introduction 5 Chapter 1. Specifications for basic system Section 1
21、. General 1 Scope and object 5 2 Normative references 5 3 Environment 5 3.1 Testing environment 5 3.2 Operation environment 5 3.3 Reference tape (SP-format) 6 3.4 Calibration tape 6 Section 2. Video-tape cassette 4 Mechanical parameters 6 4.1 Dimensions of cassette 6 4.2 Tape path and guidance 6 4.3
22、 Tape winding 6 4.4 Label and window area 6 4.5 Withdrawal force 6 4.6 Guiding groove 7 4.7 Safety cap and safety hole 7 4.8 Automatic stop 7 4.9 Cassette support areas 7 4.10 Reels 7 Section 3. Videocassette recorders 5 Mechanical parameters 7 5.1 Type of videocassette recorder 7 5.2 Reel spindle o
23、f videocassette recorder 7 5.3 Back tension 7 5.4 Audio and control head position 7 5.5 Audio and control head dimensions 7 5.6 Audio and control-track head position 8 5.7 Time-code head position 8 5.8 Tolerances on audio and control heads and time-code head (U-matic H-format) 8 5.9 Gap azimuth 8 5.
24、10 Time-code head position for SP-format 8 6 Tape speed 8 7 Track configuration and dimensions 9 7.1 Video track width (U-matic H-format) 9 7.2 Video guard-band width (U-matic H-format) 9 7.3 Location of address track (U-matic H-format) 9 latest date of publication ofan identical national standard (
25、dop) 1995-07-15 latest date of withdrawal ofconflicting national standards (dow) 1995-07-15 latest date of publication ofan identical national standard (dop) 1995-07-15 latest date of withdrawal ofconflicting national standards (dow) 1995-07-15EN60712:1994 BSI 01-2000 3 Page 7.4 Switching position b
26、etween two video heads (U-matic H-format) 9 8 Recording characteristics 9 Section 4. Tape characteristics 9 Type of magnetic tape 9 10 Construction and dimensions of the tape 10 10.1 Magnetic tape thickness 10 10.2 Magnetic tape width 10 10.3 Leader tape and trailer tape thickness 10 10.4 Leader tap
27、e and trailer tape length 10 10.5 Splicing 10 11 Magnetic tape properties 10 11.1 Magnetic orientation 10 11.2 Coercivity 10 11.3 Coercivity (SP tape) 10 Section 5. Recording characteristics 12 Luminance channel 11 12.1 Modulation system 11 12.2 Recording current 11 12.3 Characteristic frequencies 1
28、2 12.4 Pre-emphasis 13 12.5 Recording frequency bandwidth 13 12.6 White clipping level 13 12.7 Non-linear pre-emphasis (SP-format) 14 13 Audio signal channels 14 13.1 Audio recording characteristic 14 13.2 Optimum audio bias current 16 13.3 Use of the audio tracks 16 13.4 Recorded tape flux characte
29、ristics 16 14 Control signal channel 17 14.1 Control signal polarity 17 14.2 Waveform of recording current 17 14.3 Control signal level 17 14.4 Time-code recording 17 14.5 Duty cycle T 1 /T 2 17 15 Chrominance channel 18 15.1 Modulation system 18 15.2 Chrominance signal bandwidth 18 15.3 Recording s
30、ignal spectrum 19 16 U-matic H-format chrominance channel 19 16.1 Modulation system 19 16.2 Reference frequencies 19 16.3 Chrominance pre-emphasis 20 16.4 Chrominance recording current 20 Page 16.5 Chrominance signal bandwidth 20 16.6 Time delay 20 16.7 Chrominance channel (SP-format) 20 Chapter 2.
31、Specifications for standard alignment tape Section 6. General 17 Scope and object 38 18 Environment 38 Section 7. Recorded tape characteristics 19 Construction of tape and cassette 39 20 Type of tape 39 21 Tape dimensions 39 21.1 Tape thickness 39 21.2 Tape width 39 22 Magnetic orientation 39 23 Tra
32、ck configuration and dimensions 39 Section 8. Video tape recorder 24 Type of video-tape recorder 39 Section 9. Recording characteristics 25 Recording characteristics 40 26 Recording of luminance signal 40 26.1 Characteristic frequencies 40 26.2 Pre-emphasis 40 27 Recording current of chrominance sig
33、nal 40 Section 10. Recorded signals 28 Video signal 40 29 Audio signal 40 Annex A (informative) IEC U-matic SP-format reference tape 41 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 41 Figure 1 Appearance of vid
34、eocassette Top and side view 22 Figure 1a Appearance of small videocassette (small cassette) Top and side view 23 Figure 2 Appearance of videocassette Bottomview 24 Figure 2a Appearance of small videocassetteBottom view 25 Figure 2b Appearance of normal videocassette bottom view (SP cassette) 26 Fig
35、ure 2c Appearance of small videocassette bottom view (SP cassette) 27 Figure 3 Location of reels and protecting lid of the cassette 28EN60712:1994 BSI 01-2000 4 Page Figure 3a Location of reels and protecting lid of the small cassette 29 Figure 4 Relationship between reels and reel spindles 30 Figur
36、e 4a Relationship between reels andreelspindles (small cassette) 31 Figure 5 Datum plane of the cassette 32 Figure 5a Datum plane of the small cassette 33 Figure 6 Tape path and guidance 34 Figure 7 Audio and control head dimensions and tolerances 35 Figure 8 Track configuration and dimensions (magn
37、etic layer facing observer) 36 Figure 9 Switching position of two video heads and overlap 38 Table 1 General tolerances for various dimensions of videocassette (except those for which tolerances are otherwise specified) 33 Table 2 Magnetic tape pattern 37 Table 3 Parameters of standard alignment tap
38、e 39 Table 4 Additional requirements for the video-tape recorder to produce the alignmenttape 40 Table 5 Luminance non-linear pre-emphasis characteristics(625/50) 14 Table 6 Luminance non-linear pre-emphasis characteristics(525/60) 14 Table 7 Audio frequency response of noise reduction Encoding leve
39、l 16EN60712:1994 BSI 01-2000 5 Introduction This International Standard provides specifications for a helical-scan video-tape cassette recording and reproducing system which makes use of tape19mm(# in) wide, The system is widely used in educational and industrial television facilities and is suitabl
40、e for both625line-50field and525line-60field television signals. The parameters for different systems are given in the specifications which follow. This cassette system is also used in some broadcasting facilities in conjunction with special equipment designed to stabilize the reproduced signals to
41、meet broadcasting requirements. The mechanical and electrical specifications for the U-matic H-format and SP-format are contained in this standard. Chapter 1. Specifications for basic system Section 1. General 1 Scope and object This standard applies to magnetic video recording and/or playback with1
42、9mm(# in) tape cassettes on two-head helical-scan videocassette recorders, suitable for recording and/or playback of monochrome as well as colour television programmes. It contains the definition of parameters for the two-head helical-scan video recording playback system, using19mm(3/4in) tape casse
43、ttes, known as U-matic SP-format (Figure 2b and Figure 2c). The system is suitable for625/50PAL and525/60NTSC colour television systems. It gives dimensional and other characteristics necessary to permit the interchangeability of cassettes. For some parameters, the specification is only possible thr
44、ough the description of recorded tapes which implies making reference to the television system or standard in use. In such cases, the reference made for instance to525line-60field or625line-50field systems shall be considered as an example. 2 Normative references The following normative documents co
45、ntain provisions which, through reference in 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
46、to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC94, Magnetic tape sound recording and reproducing systems. IEC461:1986, Time and control code for v
47、ideo-tape recorders. 3 Environment 3.1 Testing environment Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditions: 3.2 Operation environment The system shall operate under the following conditions: temperature: 20 1 C;
48、 relative humidity: 48% to52%; air pressure: 86kPa to106kPa; conditioning before testing: 24h. temperature (in recorder): 15 C to50 C; relative humidity: 45% to75%.EN60712:1994 6 BSI 01-2000 3.3 Reference tape (SP-format) Blank tape to be used for reference recordings may be purchased from the manuf
49、acturers listed in Annex A. The electromagnetic compatibility parameters and their specifications should be specified by the manufacturers and controlled accordingly. The model name is IEC U-matic SP-format reference tape. Electromagnetic compatibility parameters and their specifications are indicated in Annex A. 3.4 Calibration tape The calibration tapes which satisfy the following requirements will be available for purchase from the manufacturers producing video tape recorders and players
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