EN 61938:1997
(Main)Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals
Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals
Applies to electrical matching values for the interconnection of analogue signals amongst audio, video and AV system equipment.
Audio-, Video- und audiovisuelle Anlagen - Zusammenschaltungen und Anpassungswerte - Empfohlene Anpassungswerte für analoge Signale
Systèmes audio, vidéo et audiovisuels - Interconnexions et valeurs d'adaptation - Valeurs d'adaptation recommandées des signaux analogiques
S'applique aux valeurs d'adaptation électrique destinées à l'interconnexion des signaux analogiques relatifs aux constituants d'un système audio, vidéo et audiovisuels.
Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals (IEC 61938:1996)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals (IEC 61938:1996)Audio-, Video- und audiovisuelle Anlagen - Zusammenschaltungen und Anpassungswerte - Empfohlene Anpassungswerte für analoge SignaleSystèmes audio, vidéo et audiovisuels - Interconnexions et valeurs d'adaptation - Valeurs d'adaptation recommandées des signaux analogiquesAudio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals35.200Vmesniška in povezovalna opremaInterface and interconnection equipment33.160.01Avdio, video in avdiovizualni sistemi na splošnoAudio, video and audiovisual systems in generalICS:Ta slovenski standard je istoveten z:EN 61938:1997SIST EN 61938:1999en01-april-1999SIST EN 61938:1999SLOVENSKI
STANDARD
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD1938Première éditionFirst edition1996-12Ó CEI 1996
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catalogueTSystèmes audio, vidéo et audiovisuels –Interconnexions et valeurs d’adaptation –Valeurs d’adaptation recommandéesdes signaux analogiquesAudio, video and audiovisual systems –Interconnections and matching values –Preferred matching values of analogue signalsSIST EN 61938:1999
1938 © IEC: 1996– 3 –CONTENTSPageFOREWORD.
7Clause1General.
111.1Scope.
111.2Normative references.
112General conditions and definitions. 132.1General conditions.
132.2Definitions.
133Power supply.
173.1Alternating current (a.c.) power supply voltages and frequencies.
173.2Direct current (d.c.) power supply voltages.
173.3Power supply feed for microphones.
174Interconnections.
174.1Connections.
154.2Connectors. 215Marking and symbols for marking. 215.1Marking. 215.2Symbols for marking. 216Electrical matching values. 216.1General purpose output/input. 216.2General purpose audio output/input. 236.3General purpose video input/output. 277Matching of microphones and amplifiers. 297.1Microphones (excluding piezoelectric types).297.2Microphones with built-in amplifier.317.3Power supply feed for electret microphones fed by a separate conductor. 317.4Phantom supply system. 317.5A-B supply system. 337.6Polarity of the audiofrequency voltage. 338Matching of record-playing units (pick-ups) and amplifiers. 339Matching of loudspeakers and amplifiers. 379.1Single unit loudspeakers. 379.2Loudspeaker systems. 379.3Voltage (or power) matching of amplifiers and loudspeakers. 399.4Polarity of the sound pressure. 4110Matching of headphones and amplifiers. 4111Matching of amplifiers to amplifiers. 4111.1Pre-amplifiers and power amplifiers for general purpose andsound reinforcement. 4111.2Broadcast and similar line amplifiers. 43SIST EN 61938:1999
1938 © IEC: 1996– 5 –TablesPages1Direct current (d.c.) power supply voltages and tolerances.
172General purpose matching values for audio signals. 233General purpose matching values for video signals. 274Matching values for microphones and amplifiers. 295Matching values for analogue record-playing units and amplifiers. 356Matching values for impedance-defined loudspeaker systems. 377Matching values for constant voltage loudspeaker systems. 378General purpose matching values for headphones and amplifiers. 419Matching values for pre-amplifiers and power amplifiers. 4310Matching values for broadcast and similar line amplifiers. 4311Required values for phantom supply systems. 4712Required values for A-B power supply systems.49Figures1Audio and video sources and destinations. 452Example of phantom power supply system. 473Example of A-B power supply system. 49SIST EN 61938:1999
1938 © IEC: 1996– 7 –INTERNATIONAL ELECTROTECHNICAL COMMISSION_____________AUDIO, VIDEO AND AUDIOVISUAL SYSTEMS –INTERCONNECTIONS AND MATCHING VALUES –PREFERRED MATCHING VALUES OF ANALOGUE SIGNALSFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardizationcomprising all national electrotechnical committees (IEC National Committees). The object of the IEC is topromote international co-operation on all questions concerning standardization in the electrical and electronicfields. To this end and in addition to other activities, the IEC publishes International Standards. Theirpreparation is entrusted to technical committees; any IEC National Committee interested in the subject dealtwith may participate in this preparatory work. International, governmental and non-governmental organizationsliaising with the IEC also participate in this preparation. The IEC collaborates closely with the InternationalOrganization for Standardization (ISO) in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters, express as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in theform of standards, technical reports or guides and they are accepted by the National Committees in thatsense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be thesubject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 1938 has been prepared by subcommittee 100C*: Audio, video andmultimedia subsystems and equipment, of IEC technical committee 100: Audio, video andmultimedia systems and equipment.International Standard 1938 cancels and replaces IEC 268-15, published in 1996, andIEC 574-4, published in 1982, and constitutes a technical revision.The text of this standard is based on the following documents:FDISReport on voting100C/22/FDIS100C/51/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.––––––––––* Formely technical committee 84.SIST EN 61938:1999
1938 © IEC: 1996– 9 –The standard is derived from IEC 268-15, IEC 574-4 and IEC 933-1 and also from relatedproposals which have been submitted up until today.The interconnection of digital signals is excluded, as it is preferred to prepare a separatepublication for it.The features of the revision are as follows:1)Unification and arrangement of existing related standards, including effective proposalswhich have been submitted.2)The concept of "general purpose input/output".3)This standard supersedes and replaces:IEC 268-15 and amendmentsIEC 574-4 and amendments.SIST EN 61938:1999
1938 © IEC: 1996– 11 –AUDIO, VIDEO AND AUDIOVISUAL SYSTEMS –INTERCONNECTIONS AND MATCHING VALUES –PREFERRED MATCHING VALUES OF ANALOGUE SIGNALS1 General1.1 ScopeThis International Standard applies to electrical matching values for the interconnection ofanalogue signals amongst audio, video and AV system equipment.This standard includes audio but not video signals for broadcast and similar use.Interconnections using the 21 contact connector described in IEC 807-9 are not included in thisstandard.Matching values for vehicle applications are excluded.For the interconnection of digital signals, it is necessary to refer to IEC 958.NOTE – A diagram showing possible interconnections, with cross-references to the appropriate clauses, is givenin figure 1.1.2 Normative referencesThe following normative documents contain provisions which, through reference in this text,constitute provisions of this International Standard. At the time of publication, the editionsindicated were valid. All normative documents are subject to revision, and parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents listed below. Members of IECand ISO maintain registers of currently valid International Standards.IEC 27: Letter symbols to be used in electrical technologyIEC 38: 1983, IEC standard voltages, Part 1: General conditions and requirementsIEC/DIS 50(723): International Electrotechnical Vocabulary (IEV) – Chapter 723: Broadcasting:Sound, television and dataIEC 94-2: 1994, Magnetic tape sound recording and reproducing systems – Part 2: CalibrationtapesIEC 107-6: 1989, Recommended methods of measurement on receivers for televisionbroadcast transmission – Part 6: Measurement under conditions different from broadcast signalstandardsIEC 268-5: 1989, Sound system equipment – Part 5: LoudspeakersIEC 268-7: 1984, Sound system equipment – Part 7: Headphones and headsetsSIST EN 61938:1999
1938 © IEC: 1996– 13 –IEC 268-11: 1987, Sound system equipment – Part 11: Application of connectors for theinterconnection of sound system componentsIEC 268-12: 1987, Sound system equipment – Part 12: Application of connectors for broadcastand similar useIEC 417: 1973, Graphical symbols for use on equipmentIEC 617: Graphical symbols for diagramsIEC 807-9: 1993, Rectangular connectors for frequencies below 3 MHz – Part 9: Detailspecification for a range of peritelevision connectorsIEC 958: 1989, Digital audio interfaceIEC 1293: 1994, Marking of electrical equipment with ratings related to electrical supply –safety requirementsISO/IEC 2382-9: 1995, Data processing – Vocabulary – Part 9: Data communicationITU-R BT.470-4: 1995, Television systems2
General conditions and definitions2.1 General conditionsAll voltages are r.m.s. voltages, unless otherwise indicated.Impedances of audio circuits are valid in the frequency range of 20 Hz to 20 kHz, unlessotherwise indicated.2.2 DefinitionsFor the purposes of this International Standard, the following definitions apply:2.2.1
luminance signal: An electrical signal representing the luminance of the televisionpicture elements. [IEV 723-05-56]2.2.2
chrominance signal: An electrical signal that is associated with the luminance signal toconvey colour information. In pract
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