1、- m 1624669 0544856 O29 W BRITISH STANDARD Methods of measurement Non-broadcast video tape recorders Part 2. Video characteristics chrominance SECAM The European Standard EN 61041-2 : 1996 has the status of a British Standard ICs 33.160.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COP
2、YRIGHT LAV BS EN BS 7434 : Part 2 : 1996 1994 61041-2 : 1996 IEC 1041-2 : BS EN 61041-2 : 1996 Amd. No. Committees responsible for this British Standard Date Text affected The preparation of this British standard was entrusted by Technical Committee EPU100, Audio, video and multimedia systems and eq
3、uipment, to Subcommittee EPUlfi, Recording, upon which the following bodies were represented: Association of Professional Recording Services Limited British Broadcasting Corporation British Kinematograph, Sound and Television Society British Radio and Electronic Equipment Manufacturers Association B
4、ritish Tape Industry Association Federation of the Electronics Industry Independent Television Association (I”VA) Royal Television Society This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board an
5、d comes into effect on 15 July 1996 O BI 1996 1 The foiowing BSI reference relates to the work on this Standard: Committee reference EPU10012 ISBN O 580 26119 O m 1624669 0544858 9T1 = BS EN 61041-2 : 1996 Contents Committees responsible National foreword page Inside front cover ii Foreword Text of
6、EN 61041-2 2 3 O BSI 1996 i Lb24bb9 0544859 838 BS EN 61041-2 : 1996 National foreword This British Standard has been prepared by Subcommittee EPIJ100/2 and is the English hguage version of EN 61041-2 : 1996, Numbroadcast video tape recorders - Methods of measurement Part 2: Video characteristics ch
7、mimm SEC, published by the European Committee for Electrotechnical Standardkaion (CENELEC). It is identical with IEC 1041-2 : 1994, published by the International Electrotechnical Commission (IEC). For ease of reference to other Parts of BS 7434, this standard has also been designated as BS 7434 : P
8、art 2. This British Standard was not circulated for public comment as it is only used within the French television system. IEC 1041 consists of the foilowing parts: Part 1 Part 2 Part 3 Geneml video (Nl3CPa) and audio (longitudinal) chamteristics Video chamteristics chrominance SECAM Audio chamteris
9、tics for FIM recording Cross-references EN 61041-1 : 1995 Publication referred to Corresponding British Standard BS EN 61041 Non-broadcast video tape recorders. Methods of Part 1 : 1995l) Geneml video (NTSCPfi) and audio (longitudinal) characteristics Compliance with a British Standard does not of i
10、tself confer immunity from legal obligations. (IEC 1041-1 : 1994) measurement 1 Also designated as BS 7434 : Part 1. O BSI 1996 rn 3624bb 0544860 55T rn EmOPW srmm EN 61041-2 NORME EUROPENNE EUR0PI-E NORM January 1996 ICs 33.160.40 Descriptors: Recording apparatus, video recording, magnetoscopes, fr
11、equency modulation, measurements, characteristics, chrominance, cross talk luminance English version Non-broadcast video tape recorders Methods of measurement Part 2: Video characteristics chrominance SECAM (IEC 1041-2 : 1994) Magntoscopes hors radiodifhsion Mthodes de mesure Rundfunks MeBverfahren
12、Partie 2: Caractristiques vido chrominance Videobandgerte fur den Gebrauch aderhalb des Teil 2: Videoeigenschaften Chrominam SECAM SECAM (lEC 1041-2 : 1994) (CEI 1041-2 : 1994) This European Standard was approved by CENELEC on 1995-11-28. CENELEC members are bound to comply with the CENZENELEC Inter
13、nal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibiographica references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC memb
14、er. This European Standard exists in three official versions (English, French, Gem). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notifed to the Central Secretariat has the same status as the official versions. CENELEC mem
15、bers are the national electrotechnica committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Eu
16、ropen de Normalisation Electrotechnique Europisches Komitee fur Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1996 Copyright reserved to CENELEC members Ref. No. EN 61041-2 : 1996 E 1624669 0544861 496 9 Page 2 EN 61041-2 1996 Foreword The text of the Intematio
17、nal Standard EC 1041-2 : 1994, prepared by SC lOOB, Recording, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the formai vote and was approved by CENELEC as EN 61041-2 on 199511-28 without any modification. The following dates were fured - latest date by which the
18、 EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 199612-01 latest date by which the national standards confiicting with the EN have to be withdmwn - (dow) 19961241 Annexes designated normalive are part of the body of the standard. A
19、nnexes designated informative are given for information oniy. in this standard, annex ZA is nonnative and annex A is informative. Annex ZA has been added by CENELEC. Contents 1 Scope 2 Nomiative references 3 General 4 Chrominance amplitude frequency 5 Chrominance signal-to-noise ratio 6 Lumllianceto
20、-chrominance crosstalk 7 Chrominancet 35 - 40 F I I I b 200 500 1 O00 2000 kHz O 2 4 Loss in dB 1 l3 20 400 kHz I0,5 dB / 1 F High-pass fitter U/ 10 Hz 100 Hz 1 kHz I undertest I I Page 9 EN 61041-2 : 1996 Synch High-pass filter f, = 100 Hz Noise meter oscilloscope Figure 2 - Chrominance signal-to-n
21、oise ratio Page 10 EN 61041-2 1996 Test signal generator - 1624669 0544869 787 VTR under test SECAM demodulator B-Y , (3 i-, 350 mV 300 mV -I- - - , 0.5 MHz to 2,5 MHz - sweep signal P sw2 I Low-pass filter fc = 500 kHZ I A Hlgh-pass filter fc = 100 HZ 0 Noise meter SW1 in position 1 SW1 in position
22、 2 Figure 3 - Luminance-to-chrominance crosstalk 9 1624669 0544870 YT9 Test signal generator SECAM Page 11 EN 61041-2 : 1996 b - Low-pass VTR - Oscilloscope under test filter TV monitor TV monitor IEC 326m Figure 4a - Circuit arrangement R B Ye B Ye IEC 32WU Figure 4b - Test signal 1 and 2 si -p- d
23、“P-P f unwanted signal Figure 4c - Selected line M 3 -i- Subcarrier amplitude on line DR: Cyan: 476mV Red: 252.7 mV Cyan: 476mV Red: 252.7 mV Blue: 2513 mV Yellow: 184,l mV Blue: 277.2 mV Yellow: 362,6 mV Burst: 16.6.6 mV Subcarrier amplitude on line DB: Cyan: 168,7 mV Red: 212,l mV Cyan: 168,7 mV R
24、ed: 212,l mV Blue: 277,2 mV Yellow: 362,6 mV Blue: 251,3 mV Yellow: 184.1 mV Burst: 214.5 mV IEC JW Figure 4 - Chrominance-to-luminance crosstalk Page 12 EN 61041-2 : 1996 m Lb24bb9 0544871 335 m generator under test - U TV colour monitor IEC UIHPI Figure 5a - Circuit arrangement Line DR of the firs
25、t half of the active field period P = 350 mV G = 302 mV M= 162 mV E = 2143 mV IEC 33W4 Figure 5b - Test signal A Line DB of the first half of the active field period P = 350 mV G I 203 mV M = 165 mV 6 = 166.7 mV IEC UlrpI Figure 5c - Test signal A ! Tl! T2; T31 TOI T5! T6; T7I c PI I L Subcarrier FO
26、R or FOB u A = 50 ns E = 100 ns c = 150 ns Lines DR and DB of the second half of the active field period P = 2T pulse amplitude P= 210 mV A, 8, C = Time shift of 2T pulse from T1 to T7 IEC 33W4 1 Figure 5d - Test signal A Figure 5 - Chrominance-to-lumlnance dlsplacement 1624689 0544872 271 = Page 13
27、 EN 61041-2 : 1996 Annex A (informative) Colour bar signal In the SECAM system, the colour video signals are subject to a pre-emphasis before going to the FM modulator in order to improve the signal-to-noise ratio. This pre-emphasis produces peaks at the colour transitions. In order to avoid excessi
28、ve frequency deviations during the transitions, the peaks are limited. The result is an increasing rise and fall time of the colour transitions after demodulation and de-emphasis, which makes the measuring of the displacement between the luminance and chrominance signals difficult. Therefore it is r
29、ecommended to use a colour bar.signal having a saturation of 33 % instead of 75 % (100/0/33/0) in order not to clip the peaks of the DFI signals and avoiding in this way also the changing the of the colour transitions. The corresponding amplitude of the subcarriers are given hereunder: Magenta Green
30、 Line DR 162 mV 302 mV Line DB 165 mV 203 mV The maximum/minimum frequencies during the pre-emphasis are given as follows: Max.: 4 756,33 kHz Min.: 4 055,87 kHz Line DR Afr is I350 kHz Max.: 4 477.22 kHz Min.: 4 022,78 kHz Line DB Af, is i227 kHz Page 14 EN 61041-2 : 1996 Lb24bb 0544873 LO8 = Annex
31、ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other pubiications. These normative references are cited at the appropriate places in the text and the p
32、ublications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (icluding
33、 amendments). NOTE. When an international publication has been modified by common modifications, indicated by (mod), the relevant ENMD applies. Pnbcation Year atie ENMD Yeax IEC 1041-1 1990 Nmroadcast video tuw recorders EN 61041-1 1995 Methods of rnmsumt Part 1: Geneml video (?TSCP!) and audw (long
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