1、BRITISH STANDARD BS EN 61041-1: 1995 BS7434-1: 1991 IEC1041-1: 1990 Incorporating Amendment Nos.1 and2 Non-broadcast video tape recorders Methods of measurement Part 1: General video (NTSC/PAL) and audio (longitudinal) characteristics The European Standard EN61041-1:1995 has the status of a BritishS
2、tandard UDC 621.397.452:621.317.083BSEN61041-1:1995 This BritishStandard, having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comesintoeffect on 30April1991 BSI04-2000 The following BSI references
3、 relate to the work on this standard: Committee reference EEL/22 Draft for comment88/23917 DC ISBN 0 580 19525 2 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee
4、 EEL/22, upon which the following bodies were represented: Association of Professional Recording Services Ltd. Audio Engineering Society British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Independent Broadcasting Authority Independe
5、nt Television Association National Council for Educational Technology (NCET) Royal Photographic Society Royal Television Society Sound and Communication Industries Federation Amendments issued since publication Amd. No. Date Comments 7678 June1993 8872 November 1995 Indicated by a sideline in the ma
6、rginBSEN61041-1:1995 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN61041-1 5 National annex NA (informative) Cross-references Inside back coverBSEN61041-1:1995 ii BSI 04-2000 National foreword This BritishStandard has been prepared by
7、 Technical Committee EPL/60 and is the English language version of EN61041-1:1995 Non-broadcast video tape recorders. Methods of measurement Part1: General video (NTSC/PAL) and audio (longitudinal) characteristics, published by the European Committee for Electrotechnical Standardization (CENELEC). I
8、t is identical with IEC1041-1:1990, published by the International Electrotechnical Commission (IEC). The designation as BS7434-1 has been retained for ease of reference to other Parts of the BS7434 series. A British Standard does not purport to include all the necessary provisions of a contract. Us
9、ers of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to28, an inside
10、back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61041-1 June1995 UDC 621.397.452:621.317.083 ICS 33.1
11、60.40 Supersedes HD619S1:1992 Descriptors: Recorders, video recording, tape recorders, measurements, characteristics, video signal, luminance, chrominance English version Non-broadcast video tape recorders Methods of measurement Part1: General video (NTSC/PAL) and audio (longitudinal) characteristic
12、s (IEC1041-1:1990) Magntoscopes hors radiodiffusion Mthodes de mesure Partie1: Gnralits, caractristiques vido (NTSC/PAL) et audio (enregistrementlongitudinal) (CEI1041-1:1990) Videobandgerte fr den Gebrauch auerhalb des Rundfunks Meverfahren Teil1: Allgemeine Eigenschaften von Video (NTSC/PAL) und T
13、on (Lngsaufzeichnung) (IEC1041-1:1990) This European Standard was approved by CENELEC on1995-05-15. 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.
14、 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, French, German). A version in any other language made by translat
15、ion 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland,
16、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 Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B
17、-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN61041-1:1995 EEN61041-1:1995 2 BSI 04-2000 Foreword The text of the International Standard IEC1041-1:1990, prepared by SC60B, Video recording, of IEC TC60, Recording, was approved by CENELEC as HD619S1 on1992-09-15. This Harmonizat
18、ion Document was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN61041-1 on1995-05-15. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A and Annex ZA are normative. Anne
19、x ZA has been added by CENELEC. Contents Page Foreword 2 Section 1. General 1.1 Scope 5 1.2 Normative references 5 1.3 Environment 5 1.4 Magnetic tape 5 1.5 Performance of measurements 5 1.6 Interchangeability test 6 Section 2. Video characteristics, luminance 2.1 Video test signal General 6 2.2 AGC
20、 operation 6 2.3 Luminance amplitude/frequency response 6 2.4 Luminance non-linear distortion 7 2.5 Luminance waveform distortion (linear distortion) 7 2.6 Luminance transient tearing 7 2.7 Luminance signal-to-noise ratio 8 2.8 Luminance drop-out compensation 8 Section 3. Video characteristics, chro
21、minance (PAL/NTSC) 3.1 Chrominance amplitude/frequency response 9 3.2 Chrominance signal-to-noise ratio 9 3.3 Chrominance-to-luminance intermodulation 10 3.4 Luminance-to-chrominance crosstalk 10 3.5 Chrominance-to-luminance displacement 10 3.6 Chrominance-to-luminance crosstalk 11 Section 4. Time b
22、ase 4.1 Time base 11 Section 5. Audio characteristics, longitudinal recording 5.1 Audio test signal General 11 5.2 AGC operation 11 5.3 Audio characteristics 11 Annex A (normative)Alternative test signals 25 Annex ZA (normative)Normative references tointernational publications with their correspondi
23、ngEuropean publications 27 Figure 1 Video test signal: nominal values, horizontal line 12 Figure 2 Video test signal: vertical field 12 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1996-07-01EN61041-1:1995
24、 BSI 04-2000 3 Page Figure 3 Circuit arrangement (see2.2, 2.3, 2.4, 2.5, 3.1, 3.5) 13 Figure 4 Test signal for luminance amplitude/frequency response 13 Figure 5 Test signal for luminance non-linear distortion(10steps) 13 Figure 6 Test signal for luminance waveform of linear distortion 14 Figure 7 L
25、uminance waveform distortion (linear distortion) 15 Figure 8 Circuit arrangement: luminance signal-to-noise ratio 15 Figure 9 Test signal for luminance signal-to-noise ratio 16 Figure 10 Circuit arrangement: luminance drop-out compensation 16 Figure 11a Test signal for luminance drop-out compensatio
26、n (to be recorded on the special test tape) 16 Figure 11b Test signal for luminance drop-out compensation (to be recorded on the special test tape) 17 Figure 11c Test signal for luminance drop-out compensation (to be recorded on the special test tape) 17 Figure 11d Drop-out compensation switching no
27、ise 18 Figure 11e Drop-out compensation, frequency and time characteristics 18 Figure 12 Test signal for chrominance amplitude/frequency response 19 Figure 13 Circuit arrangement: chrominance-to-luminance intermodulation 19 Figure 14 Test signal for chrominance-to-luminance intermodulation 19 Figure
28、 15 Circuit arrangement: luminance-to-chrominance crosstalk 20 Figure 16 Test signal for luminance-to-chrominance crosstalk 20 Figure 16a Luminance-to-chrominance crosstalk band-pass filter 21 Figure 17 Test signal for chrominance-to-luminance displacement 21 Figure 17a Test signal for chrominance-t
29、o-luminance displacement 22 Page Figure 17b Test signal for chrominance-to-luminance displacement 22 Figure 18 Circuit arrangement: chrominance-to-luminance crosstalk 22 Figure 19 Audio test signal level as a function of time 23 Figure 20 Circuit arrangement: determination of0dB level 23 Figure 21 A
30、udio amplitude response: determination of0dB level 23 Figure 22 Audio test signal: determination of hold time 24 Figure 23 Audio playback signal: determination of hold time 24 Figure A.1 Test signal for luminance amplitude/frequency response 25 Figure A.2 Test signal for luminance waveform distortio
31、n 25 Figure A.3 Test signal for luminance signal-to-noise ratio 26 Figure A.4 Test signal for chrominance-to-luminance intermodulation 264 blankEN61041-1:1995 BSI 04-2000 5 Section 1. General 1.1 Scope The methods of measurement described in this International Standard concern the assessment of the
32、performance of non-broadcast video tape recorders of the so-called “colour under” type for domestic use. This standard defines test signals, measurement set-ups and measurement conditions for non-broadcast video tape recorders of the so-called “colour under” type for domestic use, so as to make poss
33、ible the comparison of the results of measurements. Specifying limiting values of the various quantities for acceptable performance is not an object of this standard. The methods of measurement are designed to make possible the assessment of the performance of the complete recorder by using the inpu
34、t/output terminals of the device. NOTEMeasuring methods for consumer camcorders (camera-recorders) are under consideration. 1.2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IEC1041. At the time of publica
35、tion, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IEC1041 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 cu
36、rrently valid International Standards. 1.2.1 IEC standards IEC94-3:1979, Magnetic tape sound recording and reproducing systems. Part3: Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape (AmendmentNo.2:1988). IEC386:1972, Method of measurement o
37、f speed fluctuations in sound recording and reproducing equipment. IEC756:1983, Time base stability of non-broadcast video recorders. IEC883:1987, Measuring method for chrominance signal-to-random noise ratio for video tape recorders. 1.2.2 Other standards quoted CCIR Recommendation471, Nomenclature
38、 and description of colour bar signals. CCIR Recommendation567, Transmission performance of television circuits designed for use in international connections. CCIR Recommendation569, Definitions of parameters for simplified automatic measurement of television insertion test signals. CCIR Report476,
39、Colorimetric standards in colour television. 1.3 Environment All measurements shall be carried out within the environmental conditions specified by the manufacturer. If not otherwise stated by the manufacturer or by the format-standard, the device under test shall be conditioned for at least three h
40、ours before measurement begins. In addition, an adequate warm-up time shall be used. The environmental conditions during measurement, at least the temperature and the relative humidity, shall be reported together with the presentation of the results of measurements. 1.4 Magnetic tape The type of mag
41、netic tape used for measurements shall be commonly available and reported together with the presentation of the results of measurements. NOTEBy “commonly available” is to be understood the type of magnetic tape recommended by the manufacturer of the unit being tested. 1.5 Performance of measurements
42、 Unless otherwise stated the measurements shall be carried out by measuring the playback signal immediately after recording on the same device. The method of input and output of the signals, i.e.baseband or modulated RF, shall be reported together with the presentation of the results of measurement.
43、 It is recommended to use baseband input and output of the signals, i.e.via video/audio input/output terminals if available. If a modulated RF signal is used for input or output, the type of modulator or demodulator shall be reported. If the video tape recorder under test is equipped with external m
44、anual controls, e.g.tracking control, sharpness control, etc., these controls shall be set at mid-position for all measurements unless otherwise stated.EN61041-1:1995 6 BSI 04-2000 1.6 Interchangeability test The interchangeability within the IEC standard concerning the device under test shall be co
45、nfirmed, i.e.the characteristics of the signals recorded on tape and the track pattern shall comply with the standard. The procedure is under consideration. Section 2. Video characteristics, luminance 2.1 Video test signal General Unless otherwise stated the characteristics of the synchronizing sign
46、al and the characteristics of the chrominance signal shall be in accordance with the CCIR television standard relevant to the recorder under test. The nominal value of the peak-to-peak amplitude of the composite video signal, i.e.from sync tip to white level, shall be1,0V. The nominal value of the a
47、mplitude of the picture signal, i.e.from blanking level to white level, shall be: 0,7V for625 lines/50Hz systems; 0,714V for525 lines/60Hz systems. The nominal value of the amplitude of the picture signal shall be regarded as100% when defining signal amplitudes in percent (see Figure 1). Unless othe
48、rwise stated all test signals shall include in each field at least eight lines of100% white in order to ensure correct operation of the automatic gain control. These lines shall be located at the end of the vertical blanking area (see Figure 2 and note below). The active field period shall contain t
49、he specific picture test signal for measurement of the video characteristics. Unless otherwise stated the test signal shall be identical in each horizontal line of the active field period, i.e.regarding amplitude, frequency, phase, timing, etc. Unless otherwise stated the rise time and the fall time of the test signal shall be not less than2T. NOTEAlternative test signals using white reference in each line are shown in Annex A (Figure A.1,Figure A.2,Figure A.3 andFigure A.4). See also
