1、 = 3404583 0089731 O46 EUROPEAN STANDARD EN 61122 NORME EUROPENNE EUROPISCHE NORM October 1993 Descriptors: hIapetic recording, video recording, audio recording, data recording, magnetic disk, floppy disk, still video, recording track. physical characteristics, recording format English version Still
2、 video floppy disk magnetic recording system (IEC 1122 : 1992) Systme denregistrement magntique image fixe sur disque flexible (CE1 1122 : 1992) Standbild- Video-Flopp ydisk- S ys tem f fir magnetische Aufzeichnung (IEC 1122 : 1992) This European Standard was approved by CENELEC on 1993-09-22. CEKEL
3、EC 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-to-date lists and bibliographical references concerning such national standards may be obtained on ap
4、plication 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 Secret
5、ariat has the saine status as the official veisioiis. 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 United Kingdom. CENELE
6、C European Committee for Electrotechnical Stanclardization Comit Europen de Normalisation Electrotechniqiie Europisches Komitee fiir Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-lON Brussels 3 1993 Copyright reserved to CENELEC inembeis Ref. No. EN 61122 : 1993 E W 3404583 00
7、89732 T82 W Page 2 EN 61122 : 1993 Foreword The CEKELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC 1122 : 1992 could be accepted without textual changes, has shown that no coIti1tion modifications were necessaiy for the acceptance as a European S
8、tandard. “lie reference document was submitted to the CEKELEC members for formal vote and was approved by CENELEC as EN 61122 on 22 Septeniber 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-09-01 - latest date of withdrawal of conflict
9、ing national standards (dow) 1994-09-01 For products which have complied with the relevant national standard before 1994-09-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for pwluction until 1999-09-01. Page 3 EN 61122 : 1993 CONTENTS Ciauce
10、 1 General . 1.1 Scope 1.2 Normative references . 1.3 Environment . 2 Jacket . 2.1 Datum areas. datum holes and datum planes . 2.2 Flatness of jacket 2.3 Appearance of jacket 2.4 Hub 2.5 Spindle 2.6 Shutter mechanism . 2.7 Contact between disk and jacket 3 Disk . 3.1 Dimensions 3.2 Physical properti
11、es of disk . 3.3 Recording characteristics 3.4 Reference disk and sub-reference disk . 4 Track pattern . 4.1 Recording surface . 4.2 Main track . 4.3 Cue track 4.4 Track configuration . 5 Video recording format 5.1 5.2 5.3 Frequency spectrum allocation of recording signals Recording of chrominance c
12、omponent Recording of luminance component 5 5 5 6 6 6 7 8 10 10 10 10 15 15 16 16 18 18 18 18 18 18 21 21 21 23 5.4 Time difference between luminance and chrominance signals . 26 Multiplex recording of identification codes 26 5.5 5.6 Track allocation . 29 E 3404583 0081734 855 Page 4 EN 61122 : 1993
13、 Clause Audio recording format 6.1 Block diagram for audio recording . 6.2 Time compression ratio 6.3 Signal arrangement 6.4 FM signal recording characteristics . 6.5 Pre-emphasis and noise reduction 6.6 Control code . Data recording format 7.1 Channel bit rate . 7.2 Formatted recording capacity . 7
14、.3 Track format . 7.4 Sector format . 7.5 Frame format . 7.6 Sub-code ; . 7.7 Modulation 7.8 Error detection and correction scheme . Cue track application format . 8.1 Cuefile 8.2 Directory system file . 31 31 31 31 36 37 41 45 45 45 45 46 47 48 49 49 64 64 65 8.3 Cue track system file 68 8.4 Auto p
15、layback file 69 8.5 Textfile . 87 Annex A . 90 - 3404583 0089735 791 Page 5 EN 61122 : 1993 STILL VIDEO FLOPPY DISK MAGNETIC RECORDING SYSTEM 1 General 1.1 Scope This International Standard provides technical requirements for still video floppy disk systems which use a magnetic disk in a jacket, kno
16、wn 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 together on a magnetic disk. There are two formats of analogue recording. One is for 525 line - 60 field systems and the other for 625
17、line - 50 field systems. There are 50 main tracks and one cue track on the disk. Analogue picture, time-compressed sounds, and/or digital data information are recorded on the main tracks. The information recorded on the cue track can be used primarily for control purposes relating to the information
18、 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 main tracks. This standard specifies physical requirements for the jacket and the magnetic disk, and magnetic requirements for
19、the magnetic disk. This standard also specifies the signal recording formats of analogue picture, time- compressed audio signals, digital data and control information recorded on the magnetic disk to ensure interchangeability of the recorded disk. 1.2 Normative references The following standards con
20、tain provisions which, though reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investiga
21、te the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain regis- ters of currently valid International Standards. ISO/R 527: 1966, Plastics - Determination of tensile properties ASTM (American Society for Testing and Materials) Designat
22、ion D 257: Standard test methods for d.c. resistance or conductance of insulating materials. Page 6 EN 61122 : 1993 1.3 Environment Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditions, unless otherwise specified. Te
23、mperature: 23 “C I2 “C Relative humidity: 45 Yo to 55 Yo Barometric pressure: 86 kPa to 106 kPa When some discrepancy occurs in the measurement of dimensions, 20 OC f 1 OC may be adopted. 2 Jacket The jacket s,all comply with the dimensions and tolerances shown in figures 1 to 8. 2. I Datum areas, d
24、atum holes and datum planes Datum plane Z shall be determined by datum areas A, B and C in figure I. 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 I. Datum plane Y shall b
25、e orthogonal to both datum plane X and datum plane Z, and shall run through the centre of datum hole (a), as shown in figure I. Datum plane y A- Datum area A Datum plane Z /71- Datum area B I IEC 12492 Dimensions in millimeires Figure 1 - Datum areas, datum holes and datum planes Page 7 EN 61122 : 1
26、993 2.2 Flatness of jacket The shaded areas in figure2 shall be coplanar to datum plane within +0,2 mm, except for the bevelled edges. / phne IEC inm Dimensions in millimetres The shaded areas in this figure shall be coplanar to datum plane 2 within f0,2 mm, except for the bevelled edges. There shal
27、l be no moulding gate and no moulded indication such as country of origin in the shaded areas Figure 2 - Flatness of jacket = 3404583 0089738 4T0 W Page 8 EN 61122 : 1993 2.3 Appearance of jacket Figures 3 and 4 show the top, bottom and side views of the jacket. Datum piano Y 4,0 greater than -2 dB
28、at 1,251 MHz. The 43 MHz spurious component level of the RF output shall be less than -33 dB relative to the 7 MHz output. NOTES 1 7 MHz output The 7 MHz output is the playback level of a 7 MHz signal recorded at the RF reference recording current, the RF optimum recording current of the reference d
29、isk. It shall be expressed in decibels as the ratio of the 7 MHz output of the disk to be tested to that of the reference disk. Page 17 EN 61122 : 1993 B 2 1,25 MHz output The output levei of the 1,25 MHz signal played back from the disk on which 7 MHz and 1,25 MHz signal- shave been recorded in a s
30、uperposed manner shall be measured under the following conditions: - 7 MHz recording current: the RF reference recording currrent at 7 MHz signal; - 1.25 MHz recording current: the current of the reference disk at which 4,5 MHz spurious level ois -35 dB relative to the playback level of the 7 MHz si
31、gnal. The 1,25 MHz output is then defined as the ratio, expressed in decibels, of the output level of the 1,25 MHz signal played back from the disk to be tested to that from the reference disk. A 3.3.3 RF frequency response The RF frequency response Uof the video signal shall be between -2 dB and +2
32、 dB. The RF frequency response U is defined as: u=u-uo where u is the relative value in decibels of the playback output level of the 10 MHz signal to that of the 7 MHz signai for the disk to be tested, and u. is the same for the reference disk. The 7 MHz signal and the 10 MHz signal are recorded at
33、the RF reference recording current of the respective frequencies. 3.3.4 Modulation The modulation of the disk shall be: x 100 I10 (?A) (A - B) where: A is the maximum output level in one revolution 6 is the minimum output level in one revolution, as shown in figure 10. M 344583 0089748 34T Page 18 E
34、N 61122 : 1993 The modulation shall be measured at the playback output level of the 7 MHz at the 25th track. 3.4 Reference disk and sub-reference disk The reference disk is defined as a typical metal powder disk). Each company designated in annex A keeps one reference disk. The sub-reference disk is
35、 defined as a disk which has been calibrated to the reference disk for the recording characteristics specified in 3.3.1, 3.3.2 and 3.3.3. The calibrated data shall be attached to the sub-reference disk. 4 Track pattern This clause specifies the tracks and the dimensions of the track patterns of the
36、magnetic recording surface of the still video floppy disk systems. 4.1 Recording surface The mains tracks and cue track shall be provided on one side only. 4.2 Main track 4.2.1 Main tracks consist of the 1st through the 50th track. 4.2.2 Video signals can be recorded on the main tracks. For frame re
37、cording, the two fields of a frame shall be recorded on adjacent tracks. 4.2.3 Time-compressed analogue audio signals can be recorded on the main tracks. 4.2.4 Digital data signals can be recorded on the main tracks. 4.3 Cue track 4.3.1 A cue track shall be provided at the 52nd track. 4.3.2 No signa
38、l shall be recorded on the 51st track. 4.4 Track configuration 4.4.1 The track configuration is shown in figure 11 ) The characteristics of the typical metal powder disk have been approved by the Electronic Still Camera Conference. Page 19 EN 61122 : 1993 i Standard radlal ilne i i .0,3 Note 3 Refor
39、ence aplndlo Note 1 IEC 131192 Dimensions in millimetres NOTES 1 2 the dimensions of the track patterns. 3 Spindle insertion depth. The reference spindle shall be used for measuring the dimensions of the track patterns. The reference plane shall coincide with the supported surface D (see note 2 of f
40、igure 6) when measuring Figure 11 - Track pattern of recorded disk surface M 3404583 0089750 TTB B Page 20 EN 61122 : 1993 4.4.2 Dimensions of the track patterns of the recorded side are given in table 1. Table 1 - Dimensions of track patterns Item Disk outer diameter (D) Rotating speed Rotating dir
41、ection (note 1) Radius of nth track (Rn) (note 2) Radius tolerance of track Radius of 1st track (Rl) Radius of 52nd track (R52) Track pitch (P) Track width (T) Data starting position (DSP) (note 3) Azimuth angle (note 4) Azimuth tolerance 525 line - 60 field system 47 +O* mm 3 600 rpm Counter clockw
42、ise -0,2 20 - (n-1) x 0,l mm 10,014 mm 20 mm 14,9 mm 0,l mm +O O6 -0,006 mm O“ 5 1“ 22 O“ 26 NOTES 1 2 Observed from the recorded disk surface. n indicates track number n shall be 1st to 50th or 52nd. 625 line - 50 field system mm 4, +0,1 -0,2 3 O00 rpm Counter clockwise 20 - (n-1) x 0,l mm f0,014 m
43、m 20 mm 14,9 mm 0.1 mm +O -0,006 mm O“ 51“ 9 O“ . 56 3 4 the reference spindle when the spindle is inserted into the disk. From the standard radial line (SRL) which does through the centre of the PG yoke. From the radial line which goes through the centre of the disk, which shall coincide with the c
44、entre of Page 21 EN 61122 : 1993 5 Video recording format The luminance signal is recorded using the FM recording format, and the chrominance signal is recorded by first processing it to produce a line-sequential R-Y, B-Y differential colour signal, whichis then recorded using the FM recording forma
45、t. 5.1 The frequency spectrum allocation of recording signals is shown in figure 12. Frequency spectrum allocation of recording signals ID signal Lurnlnance sianal Chrorninanco signal I I Frequency doviation II A 5 A R-Y - deviation from peak white to sync tip: 1,5 i 0,05 MHz. 5.2.3 Recording curren
46、t The recording current shall be an optimum value at 7 MHz. The measurement shall be made at the 25th track. 5.2.4 Recording equalization The frequency characteristics of the FM luminance signal recording current shall be flat over the entire FM carrier bandwidth. 5.3 Recording of chrominance compon
47、ent 5.3.1 Recording . The chrominance signal components consist of R-Y anG B-Y colour difference signals which are combined alternatively into a line-sequential chrominance signal. These signals shall be frequency modulated first and then recorded with the FM luminance signal acting as bias. 5.3.2 S
48、witching position of carriers Centre frequencies of the carriers of the R-Y and B-YX colour difference signals shall be different. The centre frequencies of the carriers shall be switched before being emphasized, at a time between -03 ps and f1,5 ps from the leading edge of the hori- zontal sync. Th
49、e level of allowable noise in the blanking portion is shown in figure 13. The allowable noise level as expressed in deviation from the centre carrier frequencies is: - during period A: f 12 kHz - at all other times: f 200 kHz 8 3404583 0089754 643 W Input signal Frequencies Page 24 EN 61122 : 1993 OdB -5 dB -10 dB Colour burst Colour burst Luminance slgnal 7 Chrominance . signal ii - R-Y B-Y IEC 137m 10 kHz 30 kHz 70 kHz 100 kHz 300 kHz 700 kHz 1 MHz Figure 13 - Noise level O O O 0,s f 0,5 0.8 f 0,5 0,8 f 0,l 3,3 I 1,4 3,4 f 1.4 33 f 1,4 4,a
