1、BRITISH STANDARD BS EN 61213:1994 IEC1213:1993 Analogue audio recording on video tape Polarity of magnetization The European Standard EN61213:1994 has the status of a BritishStandard UDC 621.397.454BSEN61213:1994 This BritishStandard, having been prepared under the directionof the Electronic Equipme
2、nt Standards Policy Committee, was published underthe authority oftheStandards Board and comes into effect on 15July1994 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft for comment93/203807DC ISBN 0 580 23387 1 Cooperating organizations T
3、he European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sw
4、eden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN61213:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 General 3 4 Preservation of overall p
5、olarity in audio recording and processing equipment 3 5 Direction of magnetization of analogue baseband audio recordings 3 6 Polarity of deviation of frequency-modulation of audio signals in FM recording 4 Annex A (informative) Bibliography 5 Annex ZA (normative) Other international publications quo
6、ted in thisstandardwith the references of the relevant European publications 7 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back cover Figure 1 Method of testing the polarity characteristic of an audio analogue baseb
7、and recorder 6BSEN61213:1994 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN61213:1994 Analogue audio recording on video tape Polarity of magnetization publish
8、ed by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1213:1993 published by the International Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are r
9、esponsible 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 to8, an inside back cover and a back cover. Th
10、is 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 EN61213 January1994 UDC 621.397.454 Descriptors: Electroacoustics, sound recording, si
11、gnal processing, analog signal, polarization, magnetism, magnetic tapes, tests English version Analogue audio recording on video tape Polarity of magnetization (IEC1213:1993) Enregistrement audio-analogique sur bande vido Polarit de magntisation (CEI1213:1993) Analoge Tonaufzeichnung auf Videoband P
12、olaritt der Magnetisierung (IEC1213:1993) This European Standard was approved by CENELEC on1993-12-08. 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 alterati
13、on. 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 trans
14、lation 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, Irelan
15、d, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35,
16、 B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref.No.EN61213:1994EEN61213:1994 BSI 01-2000 2 Foreword The text of document60B(CO)155, as prepared bySub-Committee60B: Video recording, of IECTechnical Committee60: Recording, was submitted to the IEC-CENELEC parallel vote in February1993.
17、 The reference document was approved by CENELEC as EN61213 on8December1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A is informative and Annex ZA is n
18、ormative. latest date of publication ofan identical national standard (dop) 1994-12-01 latest date of withdrawal ofconflicting national standards (dow) 1994-12-01EN61213:1994 BSI 01-2000 3 1 Scope This International Standard applies to audio recording and processing, and gives requirements for the p
19、reservation of signal polarity, together with methods of test which are not already included in other standards. It is based on, and consistent with, the relevant text in IEC268-2, and the connector applications standardized in IEC268-11 and IEC268-12. NOTEPolarity characteristics of audio transduce
20、rs are dealt with in IEC268-4, IEC268-5 and IEC268-9. 2 Normative references The following normative documents contain provisions which, through reference in the text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative d
21、ocuments are subject to revision, and parties to agreements based on this International Standard 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 S
22、tandards. IEC268-2:1987, Sound system equipment Part2:Explanation of general terms and calculation methods. Amendment1(1991) IEC268-11:1987, Sound system equipment Part11: Application of connectors for the interconnection of sound system components. Amendment1(1989) Amendment2(1991) IEC268-12:1987,
23、Sound system equipment Part12: Application of connectors for broadcast and similar use. Amendment1(1991) 3 General For explanations of terms, general characteristics to be specified and methods of measurement, reference is required to IEC268-2. The preservation of signal polarity in audio recording
24、and processing equipment is important for two main reasons: a) the polarity relationship between channels of a stereo pair or multichannel set of signals is of fundamental importance in the correct re-creation of the sound field; b) some audio signals are significantly asymmetrical, and polarity inv
25、ersion can be detected, at least in critical listening conditions. 4 Preservation of overall polarity in audio recording and processing equipment 4.1 Requirements When set for normal operation (see note), equipment with audio recording and reproduction facilities and equipment with audio processing
26、facilities (except as described in4.2) shall preserve polarity from inputs to outputs, with reference to the signal polarities specified for connector applications given in IEC268-11 and/or IEC268-12. NOTEFor the purposes of this subclause, “normal operation” means that polarity inversion facilities
27、 and inverting inputs are not used. 4.2 Polarity inversion facilities The provision of polarity inversion facilities (including self-contained “inverting units”) and/or inverting inputs is permitted, provided they are marked in accordance with the requirements of IEC268-2. NOTERecordings made with d
28、eliberate polarity inversion of one channel (for artistic effect, for example) should be labelled, or include a voice message, in explanation. 5 Direction of magnetization of analogue baseband audio recordings 5.1 Requirements The direction of magnetization due to a positive-going signal applied at
29、a non-inverting input of the recorder shall be the same as the direction of motion of the tape. It is, however, difficult to measure the direction of magnetization of the tape directly. The procedure adopted is therefore to specify that the polarity of response of the reproduce chain from the reprod
30、uce head to the output, measured in accordance with5.2, shall be non-inverting, and then to specify that the polarity of signal connection for the record head shall be such that the requirements of4.1 are met. The requirements of this subclause are then automatically met. 5.2 Method of test With ref
31、erence to Figure 1, an asymmetrical current is passed through a single conductor placed close to the reproduce head, the relationship between the positive direction of current and the direction of tape travel being as shown in Figure 1. A positive-going signal shall then be obtained at the positive
32、polarity output terminal of the reproduce amplifier, as specified in IEC268-11 or IEC268-12.EN61213:1994 4 BSI 01-2000 6 Polarity of deviation of frequency-modulation of audio signals in FM recording Unless otherwise specified in the standard applying to the recording system, a positive-going audio
33、signal applied to the positive polarity input terminal of the recording amplifier, as specified in IEC268-11 or IEC268-12, shall produce an upward deviation of the carrier frequency.EN61213:1994 BSI 01-2000 5 Annex A (informative) Bibliography 1 EBU R50 Conservation of the polarity of audio signals
34、in radio and television programme production, 1988 2 SMPTE RP134 Polarity for analog audio magnetic recording and reproduction, 1986 EN 61213:1994 6 BSI 01-2000 Figure 1 Method of testing the polarity characteristic of an audio analogue baseband recorderEN61213:1994 BSI 01-2000 7 Annex ZA (normative
35、) Other international publications quoted in this standard with the references of the relevant European publications This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and
36、the publications 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. NOT
37、EWhen the international publication has been modified by CENELEC common modifications, indicated by (mod), the relevant EN/HD applies. IEC publication Date Title EN/HD Date 268-2 1987 Sound system equipment HD483.2S2 1993 A1 1991 Part2: Explanation of general terms and calculation methods 268-11 A1
38、A2 1987 1989 1991 Part11: Application of connectors for the interconnection of sound system components HD483.11S3 1993 268-12 A1 1987 1991 Part12: Application of connectors for broadcast and similar use HD483.12S2 19938 blankBSEN61213:1994 BSI 01-2000 National annex NA (informative) Committees respo
39、nsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/22 upon which the following bodies were represented: Association of Professional Recording Services Ltd. Audio
40、Engineering Society British Broadcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Federation of the Electronics Industry Independent Television Association National Council for Educational Technology (NCET) Royal Photographic Society Royal Tel
41、evision Society National annex NB (informative) Cross-references Publication referred to Corresponding British Standard BS6840 Sound system equipment HD483.2S2:1993 (IEC268-2:1987) Part2:1993 Glossary of general terms and calculation methods HD483.11S3:1993 (IEC268-11:1987) Part11:1994 Specification
42、 for application of connectors for the interconnection of sound system, components HD483.12S2:1993 (IEC268-12:1987) Part12:1993 Specification for application of connectors for broadcast and similar useBS EN 61213:1994 IEC1213:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstituti
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