1、- STD-BSI BS EN bL041-4-ENGL 1998 Lb24bb9 Ob94300 654 BRITISH STANDARD Methods of measurement Non-broadcast video tape recorders Part 4. Calibration tape (NTSCPUSECAM) The European Standard EN 61041-4 : 1997 has the status of a British Sadard ICs 33.160.40 3s EN i10414 : 1998 3s 7434 : art 4 : 1998
2、EC 61041-4 : 1997 STD-BSI BS EN 63043-4-ENGL 1998 3624669 Ob94703 590 BS EN 61041-4 : 1998 Standards Board and comes into hd No. effect on 15 April 1998 National foreword Da Text affected This British Standard is the English ianguage version of EN 610414 : 1997. It is identical with IEC 61041-4 : 19
3、97. The UK participation in its preparation was entrusted by Technicai Committee EPU100, Audio,video and multneja systems and equipment, to Subcommittee EPU100/2, Recording, which has the responsibility to: - aid enquirers to understand the te, - present to the responsible internationaEuropean commi
4、ttee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtajned on request to its secretary. For ea
5、se of reference to other parts of BS 7434, this stanard has also been designated as BS 7434 : Part 4. IEC 61041 consists of the following parts: Part 1 Part 2 Part 3 Part 4 Calibration tape (“SCPUSECAM) Part 5 Geneml uideo (NTSCP?) and audio (i0ngitudim-d) Characcics Video chamcteristh chminance SEC
6、AM Audio chamchtics fm FM mmiing Highband video tape recorders, imluing those equipped with Y/C video connectors (?VlXCPYL) From 1 Janwuy 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during t
7、he change over from one numbering system to the other, publications may contain identifiers j-om both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists nonnative references to inWnational publications with their correspondin
8、g European publications. The British Standards which implement internationai or European publications referred to in this document may be found in the BI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find faciiity of the BSI Standards El
9、ectronic Catalogue. Compliance with a British Standard does not of itself confer immunity from iegai obligations. O BSI 1998 ISBN O 680 28437 9 I I * vi * - STD=DSI DS EN 61041-4-ENGL 1998 m 1624669 Ob94702 427 D EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61041-4 August 1997 ICs 33.160.40
10、Descriptors: Recording apparatus. video recording, sound recording, magnetoscopes magnetic tapes standard maisures, measurements, video signals, specifications English version Non-broadcast video tape recorders Methods of measurement Part 4: Calibration tape (NTSC/PAL/SECAM) (IEC 6 1 04 1 -4: 1 997)
11、 Magntoscopes hors rqdiodiffusion Mthodes de mesure Partie 4: Bande talon Meverfahren (NTSC/PAUSECAM) (CE1 61 041 -4: 1 997) Video bandgerte fr den Gebrauch auerhalb des Rundfunks Teil 4: Bezugsband fr Videobandgerte fr den Gebrauch auerhalb des Rundfunks (IEC 61 041 -41997) This European Standard w
12、as approved by CENELEC on 1997-07-01. CENELEC mambers are baund to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any aiteration. Up-to-date lists and bibliographical references concerning su
13、ch national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (Engtish. French, German). A vwsiocr in any other language made by translation undw the responsibility of a CENELEC member into its own l
14、anguage and notified to the Central Secretariat has the same status as the official venions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Grsace. Iceiand, Ireland, Italy, Luxembourg, Netherlands, Norway, Pomigal, Spain, Sweden,
15、Swiaariand and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cerrtral Socrotarirrt: rue de Stassart 35, 8 - 1050 Bruauin 1997 CENELEC - All rights at exploitation in any
16、 form and by any means reservad woridwido for CENELEC merners. Ret. NO. EN 61041 -4: 1997 E STD-BSI BS EN b204L-4-ENGL 2998 Lb24bb9 Ob94703 3b3 = Page 2 EN 61041-4 : 1997 1 Foreword The text of document 1008/44/FDiS, future edition 1 of IEC 61041-4, prepared by SC 608 (transformed into SC 1006, Reco
17、rding, of IEC TC 100, Audio, video and multimedia systems and equipment), was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61041 -4 on 1997-07-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of a
18、n identical national standard or by endorsement (dopl 1 998-040 1 with the EN have to be withdrawn (dow) 19984441 - latest date by which the national standards conflicting Annexes designated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been
19、added by CENELEC. , Endorsement notice The text of the International Standard IEC 6104141997 was approved by CENELEC as a European Standard without any modification. STD.BSI BS EN 6104L-4-ENGL Lq98 Lb24bb9 Ob94704 2TT Page 3 EN 61041-4 : 1997 CONTENTS Page . INTRODUCTION 4 SECTION 1: GENERAL claw 1.
20、1 Scope and object . 5 1.2 Normative references 5 1.3 Definitions 6 1.4 Requirements 6 SECTION 2: SPECIFICATIONS OF THE SIGNALS TO BE RECORDED ON THE CALIBRATION TAPE 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Luminance signal level 7 Dropout compensation characteristics 7 YIC delay . 9 Audio FM reference recordin
21、g level 10 Audio FM peak recording level 11 Audio FM frequency response 12 Switching position 9 Figures 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 a Block diagram for luminance level preparation . Block diagram for the dropout generator Block diagram for dropout level adjustment . Black marker in th
22、e dropout Location of dropouts Block diagram for YIC delay measurement . Delay in the luminance signal recording Delay in the chrominance signal recording . Setting of the travelling microscope View on the magnetic coating side of the tape Switching position Block diagram for audio FM reference peak
23、 levei recording . Block diagram for audio FM frequency response signal recording . Dropout of 20 ps duration Dropout of 3 H duration . Signal to be recorded Block diagram for switching position adjustment Block diagram for switching position measurement 14 14 15 15 15 16 16 17 17 17 18 18 18 19 19
24、19 20 20 Annex ZA (nonnative) Normative references to international publications with their corresponding European publications . Inside back cover Q BSI 1998 EN 61041-4 1997 INTRODUCTION This part of IEC 61041 has been prepared for the reasons given below. Some of the measurement items for non-broa
25、dcast video tape recorders in IEC 61041 require specific test signals which may not be available from a general purpose test signal generator. In this case, a calibration tape can be made and used to supply the required test signals for measu rement. The video tape recorders on the market today have
26、 very good record and playback compatibility, provided that the level of the test signals and the frequencies of the carriers to be recorded are set precisely within specifications. The calibration tape can therefore be made using a non-broadcast video tape recorder of the relevant recording format
27、by recording the specified test signals. This part of IEC 61041 specifies the video and audio test signals to be recorded on the calibration tape which is used when measuring video and audio characteristics of non-broadcast video tape recorders, in accordance with the measurement items prescribed in
28、 IEC 61041. STD-BSI BS EN bL041-4-ENGL 1998 1624669 Ob9470b 072 D Page 5 EN 61041-4 : 1997 NON-BROADCAST VIDEO TAPE RECORDERS - METHODS OF MEASUREMENT - Part 4: calibration tape (NTSC/PAUSECAM) Section 1: General 1.1 Scope and object This pari of IEC 61041 specifies the general requirements for the
29、calibration tape which is used for measurement of signal characteristics of the playback systems of non-broadcast video tape recorders (NTSC/PAUSECAM). The calibration tape specified in this pari of IEC 61041 applies particularly to the measurement items prescribed in the relevant pari of IEC 61041
30、which require complex test signals, which are unavailable from a general purpose test signal generator. The object of this part is to describe the methods of measurement for non-broadcast video tape recorders. This part of IEC 61041 describes also the procedures for generating the signals and for re
31、cording the signals on the calibration tape. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this pari of IEC 61041. At the time of publication, the editions indicated were valid. All normative documents ar
32、e subject to revision, and parties to agreements based on this pari of IEC 61041 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 60
33、094-2: 1994, Magnetic tape sound recording and reproducing systems - Part 2: Calibration tapes IEC 61041-1: 1990, Non-broadcast video tape recorders - Methods of measurement - Part 7: General video (NTSCIPAL) and audio (longitudinal) characteristics IEC 61 041 -2: 1994, Non-broadcast video tape reco
34、rders - Methods of measurement - Part 2: Video characteristics chrominance SECAM IEC 61041-3: 1993, Non-broadcast video tape recorders - Methods of measurement - Part 3: Audio characteristics for FM recording IEC 61054: 1991, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic t
35、ape on type VHS - FM audio recording ITU-R Recommendation 471 -1 : 1990, Nomenclature and description of colour bar signals EIA RS-10914: 1976, Encoded colour bar signal STD-BSI BS EN bL041-4-ENGL 1998 1b24bb9 Ob94707 TO9 Page 6 EN 61041-4 : 1997 I 1.3 Definitions For the purpose of this pari of IEC
36、 61041, the following definitions apply: 1.3.1 calibration tape: Tape used to evaluate aspects of the performance of non-broadcast video tape recorders. This tape contains video and FM audio signals appropriate to the video tape recorder to be tested, taking into consideration the specified items in
37、 the audio system test described in IEC 60094-2. 1.3.2 calibration tape recorder: Video tape recorder which is used to record the test signals specified in this part of IEC 61041 for producing the calibration tape. 1.4 Requirements 1.4.1 Magnetic tape to be used The video tape to be used shall confo
38、rm to the recording format specifications of the calibration tape recorder. It is preferable to use a subreference tape. 1.4.2 Video signal to be recorded The video signal to be recorded shall conform to the standard TV signal specified for record and playback of the calibration tape recorder. 1.4.3
39、 Audio signal to be recorded The audio signal to be recorded shall conform to the audio recording format specified for record and playback of the calibration tape recorder. 1.4.4 Marking on the cassette The cassette shall be labelled with the following information: - TVsystem; - applicable recording
40、 format; - details of signals; - date/month/year when the tape was recorded; - name of the person or the company who made the recording; - others. Page 7 EN 61041-4 : 1997 Section 2: Specifications of the signals to be recorded on the calibration tape 2.1 Luminance signal level This subclause specif
41、ied the luminance signals to be recorded on the calibration tape with specified sync-tip frequency, peak white frequency, and frequency deviation, so that they conform to the recording format. 2.1.1 Block diagram Figure 1 shows the block diagram for generating the signal on this section of the calib
42、ration tape. 2.1.2 Signal to be recorded The video signal to be recorded on the calibration tape shall be a colour bar signal of ITU-R Recommendation 471-1, type (b) or equivalent containing a 100 % (0,714 Vp-p and 0,700 Vp-p for PAL) white signal. The level of the sync signai shall be 40 % (0,286 V
43、p-p) for NTSC or 43 % (0,300 Vp-p) for PAUSECAM. 2.1.3 Procedures a) Input the signal from a TV test signal generator to the calibration tape recorder. b) Using a carrier checker (or a spectrum analyzer), observe the output from the frequency modulator of the luminance signal. Then, adjust the sync-
44、tip frequency, the peak white frequency, and the frequency deviation as specified below. With respect to the reference frequencies specified for the recording format of the calibration tape recorder, the sync-tip frequency shall be within 10,05 MHz, the peak white frequency shall be within 10,05 MHz
45、, and the frequency deviation shall be within 12 70. NOTE - For precise measurement, use a carrier checker. Use of a spectrum analyzer for this measurement may result in larger measurement errors. It is advisable to check that the recording current for the chrominance signal meets the specification
46、for the respective format, prior to starting measurement. 2.2 Dropout Compensation characteristics This subclause specified the signal to be recorded on the calibration tape for measurement of the dropout compensation characteristic of the luminance signal. With this method, in accordance with the m
47、ethod described in 2.8.3 a) of IEC 61041 -1, the dropout compensation characteristic (DCC) can be measured simply by using a TV monitor. 2.2.1 Block diagram Figures 2 and 3 show the block diagram of the dropout generator and the dropout level adjustment system for generating the signal on this secti
48、on of the calibration tape. 2.2.2 Signal to be recorded The video signal to be recorded on the calibration tape shall be as shown in figure 4, which is specified in 2.8.3 a) of IEC 61 041 -1. STD-ES1 ES EN bL041-4-ENGL 1998 Lb24bb9 Ob94709 881 Page 8 EN 61041-4 : 1997 2.2.3 Procedure a) Figure 2 sho
49、ws the luminance processing circuitry for the signal which is a dropout generator circuit. b) Input a white signal of 50 % (grey) (0,357 V, for NTSC and 0,350 Vpp for PAUSECAM) to the video signal input for the dropout generator circuit. Also supply a horizontal sync signal and a vertical sync signal to the horizontal and vertical sync signal inputs of the dropout generator circuit. c) Do not record chrominance or hi-fi audio signal. d) Figure 3 also shows the level adjustment system of the dropout in the Y-FM recording signal which is shown
