1、BRITISH STANDARD BS EN 61237-3:1995 IEC 1237-3: 1995 (Incorporating corrigendum April1995) Broadcast video tape recorders Methodsof measurement Part 3: Electrical measurements for analogue component video signals The European Standard EN61237-3:1995 has the status of a British StandardBSEN61237-3:19
2、95 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 November 1995 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference E
3、PL/60 Draft for comment 91/03063 DC ISBN 0 580 24679 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/60, Recording, upon which the following bodies were represented: Association of Professional Recording Services Li
4、mited Audio Engineering Society British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Federation of the Electronics Industry ITV Association (ITVA) National Council for Educational Technology (NCET) Royal Photographic Society Royal Tel
5、evision Society Amendments issued since publication Amd. No. Date CommentsBSEN61237-3:1995 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 61237-3 5 List of references Inside back coverBSEN61237-3:1995 ii BSI 11-1999 National foreword
6、This British Standard has been prepared by Technical Committee and is the English language version of EN61237-3:1995 Broadcast video tape recorders Methods of measurement Part 3: Electrical measurements for analogue component video signals, published by the European Committee for Electrotechnical St
7、andardization (CENELEC). It is identical with IEC1237-3:1995 including the corrigendum of April1995, published by the International Electrotechnical Commission (IEC). It is envisaged that BSEN61237 will consist of the following parts: Part 1: Mechanical measurements; Part 2: Electrical measurements
8、of analogue component video signals; Part 3: Electrical measurements of analogue component video signals; Part 4: Measurements of audio performance; Part 5: Electrical measurements of digital composite video signals and digital audio signals; Part 6: Electrical measurements of digital component vide
9、o signals and digital audio signals. 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 immunity from legal obligations. Cros
10、s-references International Standard Corresponding British Standard EN 60961:1994 (IEC 961:1993) BS EN 60961:1994 Specification for helical-scan video tape cassette system using12.65mm (0.5in) magnetic tape on type L EN 61105:1993 (IEC 1105:1991) BS EN 61105:1994 Specification for reference tapes for
11、 video tape recorder systems HD 439 S1:1983 (IEC 698:1981) BS 6311:1982 Methods for measuring television tape machine parameters Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 32, an inside back cover and a back cover. This
12、 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 EN 61237-3 February 1995 UDC 621.397.452:621.317.08 Descriptors: Electroacoustics, video
13、 recording, recording apparatus, video tape recorders, radiocommunications, electrical measurements, video signals, analogue signals English version Broadcast video tape recorders Methods of measurement Part 3: Electrical measurements for analogue component video signals (IEC 1237-3:1995) Magntocope
14、s de radiodiffusion Mthodes de mesure Partie 3: Mesures lectriques pour les signaux vido analogiques composantes (CEI 1237-3:1995) Videobandgerte fr den Rundfunk Meverfahren Teil 3: Elekrische Messungen fr Videosignale mit analogen Komponenten (IEC 1237-3:1995) This European Standard was approved by
15、 CENELEC on1994-03-08. 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 sta
16、ndards 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 no
17、tified 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
18、and UnitedKingdom. 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 1995 Copyright reserved to CENELEC members Ref. No. EN 61237-3:
19、1995 EEN61237-3:1995 BSI 11-1999 2 Foreword The text of document 60B(CO)160+160A, future edition1 of IEC1237-3, prepared by SC60B, Video recording, of IECTC60, Recording, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61237-3 on1994-03-08. The following dates were fi
20、xed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A is informative. Annex ZA has been added by CENELEC. latest date by which the EN has to be implemented at nati
21、onal level by publication of an identical national standard or by endorsement (dop) 1996-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1996-02-01EN61237-3:1995 BSI 11-1999 3 Contents Page Foreword 2 1 Scope and object 5 2 Normative references 5
22、3 General 5 4 Test conditions 6 5 Measuring methods and test signals 6 5.1 Manual and automatic methods of measurement 6 5.2 Measurement of differences between adjacent tracks (fields/segments) 6 5.3 Procedure of measurement 6 5.4 Test signals 6 6 Measurement of characteristics 8 6.1 Luminance bar a
23、mplitude error 8 6.2 Synchronizing pulse amplitude error 8 6.3 Bar tilt 9 6.4 Pulse/bar ratio error 9 6.5 Pulse shape distortion 10 6.6 Amplitude/video-frequency characteristic 10 6.7 Chrominance-luminance gain inequality 11 6.8 Chrominance-luminance delay inequality 11 6.9 Line-time non-linearity 1
24、2 6.10 High-frequency non-linearity 12 6.11 High-frequency intermodulation 13 6.12 Crosstalk between channels 13 6.13 Luminance random noise 14 6.14 Chrominance random noise 15 6.15 Group delay 15 6.16 FM characteristic frequencies 15 6.17 Jitter 16 6.18 Velocity errors 17 6.19 Moir 18 6.20 Noise re
25、duction 18 6.21 Coder alignment 18 6.22 Power-supply interference 18 Annex A (informative) Bibliography 32 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 32 Page Figure 1 Test signal I: Waveform of video signals
26、for100/0/100/0 colour bars 19 Figure 2 Test signal II: five-riser staircase signals for the luminancea) andchrominanceb) channels 20 Figure 3 Test signal III: Full-amplitude sawtooth signals for line-time non-linearity andsignal-to-randoms noise measurements in the luminancea) and chrominanceb) chan
27、nels 21 Figure 4 Test signal IV: Multiburst test signals for the luminance channela) and the colour-difference channelsb) 22 Figure 5 Test signal V: Line-rate sweep signal with60% of full amplitude andapproximately6MHz upper frequency limit in luminancea) and3MHz in chrominancechannelsb) 23 Figure 6
28、 Test signal VI: Pulse and barsignalelements for measurements intheluminance channela) and colour-difference channelsb) 24 Figure 7 Test signal VII: Multipulse signal for luminance channela) and chrominance channelb); T=100ns 25 Figure 8 Test signal VIII: Sinusoid signal for colour-difference/lumina
29、nce delay and gain measurements 26 Figure 9 Test signal IX: Noise-coring measurement in luminancea) and colour-differenceb) channels 27 Figure 10 Test signal X: Test signals formeasurement of HF non-linearity andHFintermodulation 28 Figure 11 Example of oscilloscope graticule for the measurement of2
30、T and5T pulse-shape distortion 29 Figure 12 Example of high-frequency intermodulation measured with test signal X 30 Figure 13 Measurement of group delay from the shape of a20T or40T pulse of test signal VII 31 Table 1 Nominal signal amplitudes for 625-line and525-line standards 7 Table 2 Signal arr
31、angements and parameters for crosstalk measurements 14 Table 3 Test signals for measurement of FM characteristic frequencies 16 Table 4 Trigger slope and measuring slope for measurement of jitter between channels using test signal I 174 blankEN61237-3:1995 BSI 11-1999 5 1 Scope and object This part
32、of IEC1237 describes the test signals and measurement methods for equipment mainly dedicated to record/playback of analogue component TV signals on magnetic tape on reels or in cassettes. It may also be applied for measuring methods for general use in television production and transmission. The allo
33、wable tolerances for the rated values for acceptable performance are not given in this standard, but may be derived from appropriate system specifications, manufacturers specifications, etc. The necessary reference and calibration tapes are either mentioned in the specific IEC Publication of theequi
34、pment under test or included in IEC1105 (reference tapes) and IEC technical report1295 (calibration tapes) 1 1) . The methods are applicable to acceptance tests, performance comparisons and, as far as possible, to routine checks. The principal object of this document is to describe the methods of me
35、asurement, test signals and procedures which may apply to characteristics of video recording/playback machines mainly intended for professional use. The measuring methods described hereafter do not directly concern home equipment and it would appear that some will be difficult to apply to them. 2 No
36、rmative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC1237. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this
37、part of IEC1237 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. IEC 961:1993, Helical-scan video tape cassette system using12,65mm (0,5in) magnet
38、ic tape on type L. IEC 1105:1991, Reference tapes for video tape recorder systems. ITU-R Recommendation 471-1:1990, Nomenclature and description of colour bar signals. (Vol.XI-1) ITU-R Recommendation 567-3:1990, Transmission performance of television circuits designed for use in international connec
39、tions. (Vol.XII) ITU-R Recommendation 601-2:1990, Encoding parameters of digital television for studios. (Vol.XI-1) ITU-R Recommendation 656:1986, Interfaces for digital component video signals in525-line and625-line television systems. (Vol.XI-1) 3 General To ensure that the results obtained at a s
40、pecific time at a specific place are comparable to other measurements, it is advisable to specify the test signals, measuring devices and types of tapes used together with results obtained. Since measurements of television tape machines on the basis of a single test-line per field may not be fully r
41、epresentative of the full-field performance (see5.1 and5.2), they may give results which differ from those obtained or calculated with full-field test signals. Therefore it is necessary to additionally specify the measuring method: single line measurement (line number); block measurement (start-line
42、, step-by-step line(s), number of steps); full-field measurement. Additionally, it should be stated if the selection of lines coincides with a single record/playback head only. 1) Figures in square brackets refer to Annex A, Bibliography.EN61237-3:1995 6 BSI 11-1999 4 Test conditions If not otherwis
43、e stated all measurements shall be carried out at the following atmospheric conditions: 5 Measuring methods and test signals 5.1 Manual and automatic methods of measurement If automatic measuring apparatus is designed to give reliable results under the special conditions of television tape playback
44、as e.g.drop-out, jitter, noise, time-base errors, suppression of vertical blanking interval or insufficient head-to-tape contact, a significant improvement in measurement speed, accuracy and comparability of results can be achieved. Therefore preference was given to measurement methods which can be
45、carried out by automatic measuring equipment or which are suitable for automatic measuring techniques. Except where a distinction is made in particular clauses between manual and automatic methods of measurement, the measurement procedures given in this standard are valid for both methods. However,
46、although in the case of automatic measurements the procedure is carried out automatically by the test signal analyzer, the various steps are described as if they were performed manually. 5.2 Measurement of differences between adjacent tracks (fields/segments) All currently standardized recording for
47、mats make use of segmented recording techniques. The length of the segments (tracks) varies between approximately16lines and one field where the latter is often termed “non-segmented recording” which only indicates that there is no cut within the field. Since two or more heads are used for record an
48、d playback of the video information to and from the tracks, it is desirable to restrict the measurement to segments or tracks related to a specific head. This requires a special signal arrangement which provides identical information to the heads or segments in turn. A suitable arrangement for most
49、formats is to repeat a packet of up to16 different signals of a duration of one line within a field and to make the signals identical in both fields 2. 5.3 Procedure of measurement The measurements shall be carried out by measuring the playback signal after recording on the same machine (best-case configuration). Before testing the overall performance, the playback channel shall be measured by means of a calibration tape (seeclause1). In certain particular cases, if the multigeneration per
