BS-EN-61041-4-1998 BS-7434-4-1998 IEC-61041-4-1997.pdf

BRITISH STANDARD BS EN 61041-4:1998 BS 7434-4: 1998 IEC 61041-4: 1997 Methods of measurement Non-broadcast video tape recorders Part 4: Calibration tape (NTSC/PAL/SECAM) The European Standard EN 61041-4:1997 has the status of a British Standard ICS 33.160.40 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61041-4:1998 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1998 © BSI 03-1999 ISBN 0 580 28437 9 Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61041-4:1998 © BSI 03-1999i Contents Page National forewordInside front cover Foreword2 Text of EN 61041-43 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61041-4:1998 ii © BSI 03-1999 National foreword This British Standard is the English language version of EN 61041-4:1997. It is identical with IEC 61041-4:1997. The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio,video and multimedia systems and equipment, to Subcommittee EPL/100/2, Recording, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee 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 obtained on request to its secretary. For ease of reference to other parts of BS 7434, this standard has also been designated as BS 7434-4. IEC 61041 consists of the following parts: Part 1: General video (NTSC/PAL) and audio (longitudinal) characteristics; Part 2: Video characteristics chrominance SECAM; Part 3: Audio characteristics for FM recording; Part 4: Calibration tape (NTSC/PAL/SECAM); Part 5: High-band video tape recorders, including those equipped with Y/C video connectors (NTSC/PAL). From 1 January 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 the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 14, an inside 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. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 61041-4 August 1997 ICS 33.160.40 Descriptors: Recording apparatus, video recording, sound recording, magnetoscopes magnetic tapes standard measures, measurements, video signals, specifications English version Non-broadcast video tape recorders Methods of measurement Part 4: Calibration tape (NTSC/PAL/SECAM) (IEC 61041-4:1997) Magnétoscopes hors radiodiffusion Méthodes de mesure Partie 4: Bande étalon (NTSC/PAL/SECAM) (CEI 61041-4:1997) Videobandgeräte für den Gebrauch außerhalb des Rundfunks Meßverfahren Teil 4: Bezugsband für Videobandgeräte für den Gebrauch außerhalb des Rundfunks (IEC 61041-4:1997) This European Standard was approved by CENELEC on 1997-07-01. 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 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 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61041-4:1997 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61041-4:1997 © BSI 03-1999 2 Foreword The text of document 100B/44/FDIS, future edition 1 of IEC 61041-4, prepared by SC 60B (transformed into SC 100B, Recording, 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: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61041-4:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword2 Introduction3 Section 1. General 1.1Scope and object3 1.2Normative references3 1.3Definitions3 1.4Requirements4 Section 2. Specifications of the signals to be recorded on the calibration tape 2.1Luminance signal level4 2.2Dropout compensation characteristics4 2.3Y/C delay5 2.4Switching position5 2.5Audio FM reference recording level6 2.6Audio FM peak recording level6 2.7Audio FM frequency response7 Page Annex ZA (normative) Normative references to international publications with their corresponding European publicationsInside back cover Figure 1 Block diagram for luminance level preparation8 Figure 2 Block diagram for the dropout generator9 Figure 3 Block diagram for dropout level adjustment9 Figure 4 Dropout of 20 4s duration10 Figure 5 Black marker in the dropout10 Figure 6 Dropout of 3 H duration10 Figure 7 Location of dropouts11 Figure 8 Block diagram for Y/C delay measurement11 Figure 9 Signal to be recorded12 Figure 10 Delay in the luminance signal recording12 Figure 11 Delay in the chrominance signal recording12 Figure 12 Block diagram for switching position adjustment13 Figure 13 Setting of the travelling microscope13 Figure 14 View on the magnetic coating side of the tape13 Figure 15 Block diagram for switching position measurement14 Figure 16 Switching position14 Figure 17 Block diagram for audio FM reference peak level recording14 Figure 18 Block diagram for audio FM frequency response signal recording14 Table 1 Specified frequency deviation7 Table 2 Specified frequency deviation8 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1998-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1998-04-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61041-4:1997 © BSI 03-19993 Section 1. General Introduction This part of IEC 61041 has been prepared for the reasons given below. Some of the measurement items for non-broadcast 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 measurement. The video tape recorders on the market today have 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 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 IEC 61041. 1.1 Scope and object This part of IEC 61041 specifies the general requirements for the calibration tape which is used for measurement of signal characteristics of the playback systems of non-broadcast video tape recorders (NTSC/PAL/SECAM). The calibration tape specified in this part of IEC 61041 applies particularly to the measurement items prescribed in the relevant part of IEC 61041 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 recording 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 part of IEC 61041. 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 61041 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60094-2:1994, Magnetic tape sound recording and reproducing systems Part 2: Calibration tapes. IEC 61041-1:1990, Non-broadcast video tape recorders Methods of measurement Part 1: General video (NTSC/PAL) and audio (longitudinal) characteristics. IEC 61041-2:1994, Non-broadcast video tape recorders 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 tape on type VHS FM audio recording. ITU-R Recommendation 471-1:1990, Nomenclature and description of colour bar signals. EIA RS-189A:1976, Encoded colour bar signal. 1.3 Definitions For the purpose of this part of IEC 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 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 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:26:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61041-4:1997 4 © BSI 03-1999 1.4 Requirements 1.4.1 Magnetic tape to be used The video tape to be used shall conform 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 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: TV system; applicable recording format; details of signals; date/month/year when the tape was recorded; name of the person or the company who made the recording; others. Section 2. Specifications of the signals to be recorded on the calibration tape 2.1 Luminance signal level This subclause specified 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 calibration 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 signal shall be 40 % (0,286 Vp-p) for NTSC or 43 % (0,300 Vp-p) for PAL/SECAM. 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-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 ± 0,05 MHz, the peak white frequency shall be within ± 0,05 MHz, and the frequency deviation shall be within ± 2 %. NOTEFor 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 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