1、W 3404583 0082864 032 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60843-3 August 1993 UDC 621.397.454 Descriptors: Video recording, video tape recorder, magnetic tapes, cassette for magnetic tapes, specifications, characteristics English version Helical-scan video tape cassette system usi
2、ng 8 mm magnetic tape - 8 mm Video Part 3: High-band specifications for Hi 8 (IEC 843-3 1993) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de 8 mm -Video 8 mm Partie 3: Spcifications frquences Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband 8 mm -
3、Video 8 Teil 3: Hochband-Spezifikation fr Hi 8 leves pour Hi 8 (CE1 843-3 1993) (IEC 843-3 : 1993) This European Standard was approved by CENELEC on 1993-07-06. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standa
4、rd the status of a national standard without any alteration. Up-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, Frenc
5、h, 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 Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, D
6、enmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrot
7、echnische Normung Central Secretariat: rue de Stassart 35, B- 1050 Brussels O 1993 Copyright reserved to CENELEC members Ref. No. EN 60843-3 : 1993 E m 3404583 0082865 Ti9 m Page 2 EN 60843-3 : 1993 Foreword The text of document 60B (CO) 142, as prepared by Sub-committee 60B: Video recording, of IEC
8、 Technical Committee 60: Recording, was submitted to the IEC-CENELEC parallel vote in March 1992. The reference document was approved by CENELEC as EN 60843-3 on 6 July 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-07-01 - latest date
9、 of withdrawal of conflicting national standards (dow) 1994-07-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given only for information. In this standard, annexes A and ZA are normative and annex B is informative. W 3404583 0082866 905 Page
10、3 EN 60843-3 : 1993 CONTENTS General 1.1 Scope . 1.2 Normative references . Definition of high-band tapes 2.1 Reference tape 2.2 Video tape cassette 3.1 Recognition holes . Recording of luminance component . 4.1 Frequency spectrum allocation of recording signals 4.2 Pre-emphasis and clipping 4.3 Mod
11、ulation characteristics . 4.4 Recording current . Video characteristics of the high-band tape 4 4 4 4 4 4 5 5 6 6 7 8 8 Annexes 9 A Characteristics of the reference tape RSE-5001 . B Name and address of the manufacturer of the reference tape 9 Annex ZA (normative) Other international publications qu
12、oted in this standard with the references of the relevant European publications 1 0 Page 4 EN 60843-3 : 1993 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING 8 mm MAGNETIC TAPE - 8 mm VIDEO Part 3: High-band specifications for Hi 8 1 General 1.1 Scope This part of IEC 843 provides high-band specificati
13、ons for high-quality recording and playback with the 8 mm video system. This part is applicable to both 525 line-60 field and 625 line-50 field TV signals. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of th
14、is part of IEC 843. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 843 are encouraged to investigate the possibility of applying the most recent editions of the normative documents in
15、dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 843-1, Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video - Part I: General (in preparation). IEC 843-2: 1992, Helical-scan video tape cassette system using 8 mm magnet
16、ic tape - 8 mm Video - Pari 2: PCM multi-track audio system IEC 1 1 05: 1991, Reference tapes for video tape recorder systems. 2 Definltlon of hlgh-band tapes 2.1 Reference tape High-band 8 mm tapes shall be used for high-band 8 mm video system. A reference tape has been defined for measurements of
17、the recording characteristics of the high-band 8 mm tapes. This reference tape is an MP tape numbered RSE-5001 specified in IEC 1105. NOTE - See annex A for details of the RSE-5001. 2.2 All measurements are to be made in comparison with the reference tape described in 2.1, with the reference values
18、taken as O dB. Video characteristics of the high-band tape I EC page 71 3404583 00828b8 788 Page 5 EN 60843-3 : 1993 2.2.1 RF optimum recording current The RF optimum recording current shall be O f 1 dB at 7 MHz for MP tape and 1 dB f 1 dB at 7 MHz for ME tape. 2.2.2 RF output level The RFoutput lev
19、el shall be: for luminance: greater than 3 dB at 7 MHz for high-band MP tape; greater than 5 dB at 7 MHz for high-band ME tape; for chrominance: greater than O at 0,75 MHz for high-band MP tape; greater than -1 dB at 0.75 MHz for high-band ME tape. 2.2.3 RF frequency response D The RF frequency resp
20、onse D shall be greater than O. NOTE - The playback output levels of the 7 MHz and 10 MHz signals recorded at the RF reference recording current of the respective frequencies should be measured. The RF frequency response D is defined as follows: where d is the relative value in decibels of the playb
21、ack output level of the 10 MHt signal to that of the 7 MHr signal for the tape to be tested and where do is the same for the reference tape. 2.2.4 Carrier-to-noise ratio The carrier-to-noise ratio shall be: for luminance: greater than 2 dB at 7 MHz for high-band MP tape; greater than 5 dB at 7 MHz f
22、or high-band ME tape; greater than O at 0,75 MHz for both high-band MP and ME tapes. for chrominance: 3 Video tape cassette 3.1 Recognition holes Recognition holes 1 and 5 are used to distinguish among normal MP, high-band MP and high-band ME tapes (see table 1 on page 11). Other holes are used as d
23、efined in the existing standards for the 8 mm video system. I EC page 91 3404583 0082867 bL4 High-band MP High-band ME Page 6 EN 60843-3 1993 Closed Open 0 Open 0 Closed Recognition hole 5 Accidental erasure protection hole Recognition hole 1 Recognition hole 4 Recognition hole 3 Recognition hole 2
24、IEC I lar92 Figure 1 - Location of recognition holes Table 1 - Assignment of recognition holes I Hole 1 I Hole 5 I 1 Normal MP I Closed I Closed 01 4 Recording of lumlnance component 4.1 The frequency spectrum allocation of recording signals is shown in figure 2 below. Frequency spectrum allocation
25、of recording signals Tracking pilot signals Down-converted chrominance signal Frequency deviation FM audio signal - 2.0 MHz - FM luminance signal Sync. tip frequency Peak white J frequency I I I I, I I I I l L 16 7 i8 9 MHr 3 4 5l f,.f, fcl 82 f; irB 5:7.MHz 7,.7 MHz IEC I121192 Frequency fA is the
26、FM audio carrier : 1.5 MHz fB is the FM audio carrier : i .7 MHz fc is the down converted chrominance carrier f, - f4 are the tracking pilot carriers Sync tip frequency: 5.7 MHz Peak white frequency: 7,7 MHz Frequency deviation: 2.0 MHz Figure 2 - Frequency spectrum allocation of recording signals I
27、EC page 111 m 3404583 0082870 33b m Page 7 EN 60843-3 : 1993 4.2 Pre-emphasis and clipping The luminance signal shall be given sub pre-emphasis and main pre-emphasis and DC clipped prior to frequency modulation. Due to the adoption of DC clipping, the clipping levels qhown below are determined irres
28、pective of the frequency characteristics of the emphasized signal. White clipping level: Dark clipping level: (The sync tip to peak white level is 100 %.) 220 % measured from sync tip. 90 % measured from sync tip. Main pre-emphasis The main pre-emphasis shall be added by using the circuit shown in f
29、igure 3 or its equivale nt . input 1-PTq-r output IEC I122?X T=CX Rb=0.47ps X = RblRa = 3 Figure 3 - Main pre-emphasis circuit Sub pre-emphasis The sub pre-emphasis characteristics shall be in accordance with the IEC 843-1 specif cat ion. Vertical pre-emphasis The vertical pre-emphasis is optional a
30、nd shall be added prior to the sub pre-emphasis and killed during the vertical blanking interval. A typical vertical pre-emphasis circuit is shown in figure 4. + I output Luminance o - inout 1 - Kp Limiter t-T +1 i- Vertical blancking pulse I KP I s 035 X S 0.35 Limiting level $5 IRE Figure 4 - Typi
31、cal vertical pre-emphasis circuit I EC page 131 Page 8 EN 60843-3 1993 4.3 Modulation characteristics FM carrier frequencies corresponding to reference video levels shall be as follows: Sync tip level: Peak white level: Deviation: 5,7 MHz f 0,1 MHz 7.7 MHz f 0.05 MHz 2,0 MHz f 0.1 MHz 4.4 Recording
32、current The recording current shall exhibit the optimum value at 7 MHz, which is the center frequency of the FM carrier range as defined in 4.3. IEC page 151 Page 9 EN 60843-3 : 1993 Annex A (normative) Characteristics of the reference tape RSE-5001 A.l Model IEC 8 mm format MP reference tape RSE-50
33、01. A.2 Specifications A.2.1 Electromagnetic properties a) RF optimum recording current (7 MHz) b) RF output for luminance (7 MHz) c) RF output for chrominance (0,75 MHz) d) RF frequency response (IO MHZI7 MHz) e) Carrier-to-noise ratio for luminance (7 MHz) f) Carrier-to-noise ratio for chrominance
34、 (0,75 MHz) O f 0,3 dB O f 0,3 dB O f 0,3 dB O f 0,3 dB O f 0,3 dB O f 0.3 dB The specifications stated in this subclause are added to those of Hi 8. A.2.2 Tape thickness 13 pm (nominal). A.2.3 Tape length 28 m (equivalent to P6-30). Other specifications shall comply with IEC 843-1. NOTE - RSE-5001
35、is the IEC 8 mm format MP reference tape with the following specifications of electromagnetic properties: a) b) c) d) RF optimum recording current (5 MHz) RF output for luminance (5 MHz) RF output for chrominance (0,75 MHz) RF frequency response (5 MHrl2 MHz) O f 0.3 dB; O f 0.3 dB; O f 0.3 dB; O f
36、0.3 dB. Annex B (inform at ive) Name and address of the manufacturer of the reference tape Apply to Sony Corporation Magnetic Products Group Major Customer Sales Division 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141, Japan Tel : 03-3448-3126 Tlx : SONYCORPJ 22262 Fa : 03-3447-4378 I EC page 17 and
37、191 m 3404583 0082873 045 m Page 10 EN 60843-3 : 1993 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications When the international publication has been modified by CENELEC common modifications, indicated by (mod), the relevant EN/HD applies. IEC publication Date Title ENIHD Date 843- 1 843-2 1105 - Helical-Scan video tape cassette system using - 8 mm magnetic tape - 8 mm Video Part 1: General (in preparation) 1992 Part 2: PCM multi-track audio system - 1991 Refweme tapes for video tape recorder - systems
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