1、BRITISH STANDARD BS EN 61122:1994 IEC1122:1992 Specification for Still video floppy disk magnetic recording system The European Standard EN61122:1993 has the status of a BritishStandard UDC 621.397.43BSEN61122:1994 This BritishStandard, having been prepared under the directionof the Electronic Equip
2、ment Standards Policy Committee, was published underthe authority of the Standards Board and comes into effect on 15February1994 BSI03-2000 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft for comment90/20934 DC ISBN 0 580 22699 9 Cooperating organiz
3、ations 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 France Portugal Germany Spain G
4、reece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN61122:1994 BSI 03-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 61122 5 National annex NA (informative) Committees resp
5、onsible Inside back coverBSEN61122:1994 ii BSI 03-2000 National foreword This BritishStandard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN61122:1993 Still video floppy disk magnetic recording system, published
6、by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1122:1992, published by the International Electrotechnical Commission (IEC). For ease of production Figure 43 and Annex A include the French text. Copies of ASTM documents can be purchased from BSI, Cus
7、tomer Services, Publications, Linford Wood, Milton Keynes, MK146LE. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immuni
8、ty from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to72, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be ind
9、icated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61122 October1993 UDC 621.397.43 Descriptors: Magnetic recording, video recording, audio recording, data recording, magnetic disk, floppy disk, still video, recording track, physical character
10、istics, recording format English version Still video floppy disk magnetic recording system (IEC1122:1992) Systme denregistrement magntique imagefixe sur disque flexible (CEI1122:1992) Standbild-Video-Floppydisk-System fr magnetische Aufzeichnung (IEC1122:1992) This European Standard was approved by
11、CENELEC on1993-09-22. 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 stan
12、dards 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 own language and not
13、ified 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, Sweden, Switzerland a
14、nd 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 1993 Copyright reserved to CENELEC members Ref. No. EN61122:199
15、3 EEN61122:1993 BSI 03-2000 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC1122:1992 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as a European Standard. The
16、 reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as EN61122 on22September1993. The following dates were fixed: For products which have complied with the relevant national standard before1994-09-01, as shown by the manufacturer or by a certification
17、 body, this previous standard may continue to apply for production until1999-09-01. Contents Page Foreword 2 1 General 5 1.1 Scope 5 1.2 Normative references 5 1.3 Environment 5 2 Jacket 5 2.1 Datum areas, datum holes and datum planes 5 2.2 Flatness of jacket 7 2.3 Appearance of jacket 8 2.4 Hub 10
18、2.5 Spindle 10 2.6 Shutter mechanism 10 2.7 Contact between disk and jacket 10 3 Disk 15 3.1 Dimensions 15 3.2 Physical properties of disk 15 3.3 Recording characteristics 16 3.4 Reference disk and sub-reference disk 17 4 Track pattern 17 4.1 Recording surface 17 4.2 Main track 17 4.3 Cue track 17 4
19、.4 Track configuration 18 5 Video recording format 19 5.1 Frequency spectrum allocation of recording signals 19 5.2 Recording of luminance component 20 5.3 Recording of chrominance component 22 5.4 Time difference between luminance and chrominance signals 24 5.5 Multiplex recording of identification
20、 codes 24 5.6 Track allocation 27 6 Audio recording format 28 6.1 Block diagram for audio recording 28 6.2 Time compression ratio 28 6.3 Signal arrangement 28 6.4 FM signal recording characteristics 32 6.5 Pre-emphasis and noise reduction 32 6.6 Control code 36 7 Data recording format 40 7.1 Channel
21、 bit rate 40 7.2 Formatted recording capacity 40 7.3 Track format 40 latest date of publication ofan identical national standard (dop) 1994-09-01 latest date of withdrawal ofconflicting national standards (dow) 1994-09-01EN61122:1993 BSI 03-2000 3 Page 7.4 Sector format 40 7.5 Frame format 41 7.6 Su
22、b-code 42 7.7 Modulation 43 7.8 Error detection and correction scheme 43 8 Cue track application format 55 8.1 Cue file 55 8.2 Directory system file 56 8.3 Cue track system file 58 8.4 Auto playback file 59 8.5 Text file 68 Annex A (informative) 71 Figure 1 Datum areas, datum holesanddatumplanes 6 F
23、igure 2 Flatness of jacket 7 Figure 3 Appearance of video floppy diskjackets,top view and side views 8 Figure 4 Appearance of video floppydiskjacket,bottom view 9 Figure 5 Hub 11 Figure 6 Relationship between datumplaneandhub 12 Figure 7 Spindle 13 Figure 8 Shutter mechanism 14 Figure 9 Point of mea
24、surement of curl of the disk 15 Figure 10 Modulation of the disk 17 Figure 11 Track pattern of recorded disk surface 18 Figure 12 Frequency allocation ofrecordingsignals 20 Figure 13 Noise level 22 Figure 14 Polarity of colour difference signal 23 Figure 15 Bit allocation of ID codes 25 Figure 16 Bi
25、t pattern of field/frame code 25 Figure 17 Bit pattern of track number code 26 Figure 18 Bit pattern of year/month/day code 26 Figure 19 Bit-switching point 27 Figure 20 Track allocation 27 Figure 21 Block diagram for audio recording 28 Figure 22 Track format 28 Figure 23 Example of how a sequence i
26、s recorded,showing the four types of sectors 29 Figure 24 Signal arrangement for each sector 30 Figure 25 Overshoot and undershoot 31 Figure 26 Rise time and fall time 31 Page Figure 27 Example of pre-emphasis circuit 33 Figure 28 Source signal for measurement 33 Figure 29 Response of compressor 34
27、Figure 30 Linearity specification 35 Figure 31 Example of NR circuit 35 Figure 32 Code allocation 37 Figure 33 Track format 40 Figure 34 Sector format 41 Figure 35 Sync-frame format 41 Figure 36 Sub-frame format 42 Figure 37 Data-frame format 42 Figure 38 Sub-code format 43 Figure 39 Parity symbols
28、of sub-frame 45 Figure 40 C1 parity symbols of data-frame 46 Figure 41 C2 parity symbols of data frame 47 Figure 42 Parity symbols of sub-code 48 Figure 43 49 Figure 44 Directory system file 56 Table 1 Dimensions of track patterns 19 Table 2 Emphasis characteristics ofluminancesignal 21 Table 3 Emph
29、asis characteristics ofchrominancesignal 22 Table 4 Modulation characteristics 23 Table 5 Use of the four types of sectors 29 Table 6 Specifications for each type of sector 30 Table 7 Specifications for T 1to T 9(type1, type4) 31 Table 8 Specifications for T 1to T 9(type2, type3) 31 Table 9 FM carri
30、er frequencies 32 Table 10 Pre-emphasis characteristics for525line60 field system 32 Table 11 Pre-emphasis characteristics for625line50 field system 33 Table 12 Frequency response of compressor 34 Table 13 Maximum allowable lowfrequencycomponents 35 Table 14 43 Table 15 43 Table 16 44 Table 17 46 Ta
31、ble 18 47 Table 19 8/10 Modulation 50 Table 20 55 Table 21 57EN61122:1993 BSI 03-2000 4 Page Table 22 57 Table 23 58 Table 24 59 Table 25 END command 59 Table 26 STOP command 59 Table 27 WAIT command 60 Table 28 PRINT command 60 Table 29 SET F0 command 60 Table 30 SET F1 command 60 Table 31 RESET F0
32、 command 60 Table 32 RESET F1 command 61 Table 33 DISPLAY command 61 Table 34 CLEAR VIDEO command 61 Table 35 SOUND command 61 Table 36 CLEAR SOUND command 61 Table 37 WAIT SOUND command 62 Table 38 SOUND EXTENDED command 62 Table 39 CLEAR TEXT command 62 Table 40 TEXT command 63 Table 41 TEXT FILE
33、command 63 Table 42 TEXT TRACK command 63 Table 43 LINK FILE command 64 Table 44 LINK TRACK command 64 Table 45 LOOP SET command 65 Table 46 JUMP command 65 Table 47 LOOP JUMP command 65 Table 48 JUMP F0 SET command 65 Table 49 JUMP F0 RESET command 66 Table 50 JUMP F1 SET command 66 Table 51 JUMP F
34、1 RESET command 66 Table 52 JUMP T0 ON command 66 Table 53 JUMP T0 OFF command 67 Table 54 JUMP T1 ON command 67 Table 55 JUMP T1 OFF command 67 Table 56 JUMP T2 ON command 68 Table 57 JUMP T3 ON command 68 Table 58 COLOUR 69 Table 59 Second byte 70EN61122:1993 BSI 03-2000 5 1 General 1.1 Scope This
35、 International Standard provides technical requirements for still video floppy disk systems which use a magnetic disk in a jacket, known as a still video floppy disk. In these systems analogue picture, time-compressed analogue audio sounds and/or digital data information are recorded separately or t
36、ogether on a magnetic disk. There are two formats of analogue recording. One is for525 line60 field systems and the other for625 line50 field systems. There are50 main tracks and one cue track on the disk. Analogue picture, time-compressed sounds, and/or digital data information are recorded on the
37、main tracks. The information recorded on the cue track can be used primarily for control purposes relating to the information on the main tracks. As far as control functions are concerned, the control functions specified on the cue track shall dominate over other control functions recorded on the ma
38、in tracks. This standard specifies physical requirements for the jacket and the magnetic disk, and magnetic requirements for the magnetic disk. This standard also specifies the signal recording formats of analogue picture, time-compressed audio signals, digital data and control information recorded
39、on the magnetic disk to ensure interchangeability of the recorded disk. 1.2 Normative references The following standards contain provisions which, though reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All s
40、tandards 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 standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
41、ISO/R527:1966, Plastics Determination of tensile properties. ASTM (American Society for Testing and Materials) Designation D257: Standard test methods for d.c. resistance or conductance of insulating materials. 1.3 Environment Tests and measurements made on the system to check the requirements of th
42、is standard shall be carried out under the following conditions, unless otherwise specified. When some discrepancy occurs in the measurement of dimensions,20 C 1 C may be adopted. 2 Jacket The jacket shall comply with the dimensions and tolerances shown in Figure 1 to Figure 8. 2.1 Datum areas, datu
43、m holes and datum planes Datum plane Z shall be determined by datum areas A, B and C in Figure 1. Datum plane X shall be orthogonal to datum plane Z and shall run through the centre of datum hole (a) and the centre of the centre hole of the lower shell, as shown in Figure 1. Datum plane Y shall be o
44、rthogonal to both datum plane X and datum plane Z, and shall run through the centre of datum hole(a), as shown in Figure 1. Temperature: 23 C 2 C Relative humidity: 45% to55% Barometric pressure: 86kPa to106kPaEN61122:1993 6 BSI 03-2000 Figure 1 Datum areas, datum holes and datum planesEN61122:1993
45、BSI 03-2000 7 2.2 Flatness of jacket The shaded areas in Figure 2 shall be coplanar to datum plane within 0,2mm, except for the bevelled edges. The shaded area in this figure shall be coplanar to datum plane Z within 0,2mm, except for the bevelled edges. There shall be no moulding gate and no moulde
46、d indication such as country of origin in the shaded areas Figure 2 Flatness of jacketEN61122:1993 8 BSI 03-2000 2.3 Appearance of jacket Figure 3 and Figure 4 show the top, bottom and side views of the jacket. No portion shall extend beyond the plane of the top outer surface of the jacket. NOTEThis
47、 dimension is given in Figure 6, note1 Figure 3 Appearance of video floppy disk jackets, top view and side viewsEN61122:1993 BSI 03-2000 9 No portion shall extend beyond the plane of the bottom outer surface of the jacket. NOTE 1The shaded areas are reserved for recognition holes for recording media
48、. The minimum depth of these holes shall be2,6mm. NOTE 2Mis-erasure protection. This hole is to be used in conjunction with a mechanical switch. When the hole is covered, recording shall be possible. When the hole is uncovered, recording shall not be possible. The closure tab shall not extend above
49、the plane of the bottom outer surface of the jacket nor shall it deflect more than0,6mm below this plane under a weight of0,6N. When the closure tab is broken off, the distance from datum plane X to the near side of the resulted opening shall be21.6mm or shorter, and to the far side of that shall be25.2mm or longer. The distance from datum plane Y to t
