1、BRITISH STANDARD BS EN 50332-2:2003 Sound system equipment: Headphones and earphones associated with portable audio equipment Maximum sound pressure level measurement methodology and limit considerations Part 2: Matching of sets with headphones if either or both are offered separately The European S
2、tandard EN 50332-2:2003 has the status of a British Standard ICS 17.140.50; 33.160.50 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHSBS EN 50332-2:2003 This Br
3、itish Standard, was published under the authority of the Standards Policy and Strategy Committee on 10 May 2004 BSI 10 May 2004 ISBN 0 580 43749 3 National foreword This British Standard is the official English language version of EN 50332-2:2003. The UK participation in its preparation was entruste
4、d to Technical Committee EPL/100, Audio, visual and multimedia systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications re
5、ferred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary pro
6、visions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretatio
7、n, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover
8、. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or
9、 networking permitted without license from IHSEUROPEAN STANDARD EN 50332-2 NORME EUROPENNE EUROPISCHE NORM October 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat
10、: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50332-2:2003 E ICS 17.140.50; 33.160.50 English version Sound system equipment: Headphones and earphones associated with portable audio e
11、quipment Maximum sound pressure level measurement methodology and limit considerations Part 2: Matching of sets with headphones if either or both are offered separately Equipement de systmes acoustiques: Casques et couteurs associs avec un baladeur Mthode de mesure de niveau maximal de pression acou
12、stique et prise en compte dune limite Partie 2: Adaptation des quipements avec des couteurs provenant de diffrents fabricants Elektroakustische Gerte: Kopfhrer und Ohrhrer in Verbindung mit tragbaren Audiogerten Verfahren zur Messung des maximalen Schalldruckpegels und Angaben zu Grenzwerten Teil 2:
13、 Anpassung von Gerten und Kopfhrern, wenn eine der beiden oder beide Komponenten getrennt angeboten werden This European Standard was approved by CENELEC on 2003-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europe
14、an 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 (Engli
15、sh, 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, B
16、elgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Copyright European Committee for Electrotechnical Standardization Provided by IHS
17、 under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - - - -EN 50332-2:2003 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC206, Consumer equipment for entertainment and information and related sub-systems. Th
18、e Part 1 of this standard describes conditions and procedures for combination of player units and headphones sold as one-package sets. The sound pressure limitation (SPL) of these sets is lost when players or headphones with standardised sockets and plugs are arbitrarily combined. This Part 2 provid
19、es matching values which guarantee the SPL limit also for the aforementioned condition. This text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50332-2 on 2003-07-01. The following dates were fixed: - latest date by which the EN has to be implemented
20、 at national level by publication of an identical national standard or by endorsement (dop) 2004-07-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-07-01 _ Copyright European Committee for Electrotechnical Standardization Provided by IHS under
21、 license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS 3 EN 50332-2:2003 1 Scope This Part 2 of EN 50332 specifies matching values for the use of battery-operated audio equipment and headphones/earphones defined for the use with those and with standardi
22、sed connectors allowing to combine components of different manufacturers or different design sold separately in order to avoid possible hearing impairment by excessive sound pressure resulting from them. Compared with one-package sets the sound pressure level at the ear cannot be fixed by only one c
23、ondition but needs at least two characteristics, one each for player and the headphones/earphones, defined by the matching values for their connection. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative refere
24、nces are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revision of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the l
25、atest edition or the publication referred to applies. EN 50332-1:2000 Sound system equipment: Headphones and earphones associated with portable audio equipment - Maximum sound pressure level measurement methodology and limit considerations - Part 1: General method for “one package equipment“ EN 6026
26、8-3:2000 Sound system equipment - Part 3: Amplifiers (IEC 60268-3:2000) EN 60268-7:1996 Sound system equipment - Part 7: Headphones and earphones (IEC 60268-7:1996) EN 60804 Integrating-averaging sound level meters (IEC 60804) EN 61938:1997 Audio, video and audiovisual systems - Interconnections and
27、 matching values - Preferred matching values of analogue signals (IEC 61938:1996) IEC 60268-1 Sound system equipment - Part 1: General (IEC 60268-1:1985 + A1:1988 harmonized as HD 483.1 S2:1989) 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 portable audio equi
28、pment battery operated binaural small audio equipment used with earphone, which is intended to be mainly used for listening to the music outdoors. D.C. operated players with separate a.c. adapter are included NOTE Players with loudspeakers and equipment with one-ear earphone are excluded; however th
29、is does not mean that only the devices covered by this standard may cause hearing impairment. Only the big difference in daily use decreases the risk caused by home equipment even at higher listening level. 3.2 portable audio headphones and earphones headphones and earphones, which are intended to b
30、e used with battery operated audio equipment and to be mainly used for binaural (mostly stereo) listening to the music outdoors. The actual design is mostly of supra aural or intra concha type, however also other solutions are in use. The main feature of all these headphones is their small size Copy
31、right European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHSEN 50332-2:2003 4 3.3 wide band characteristic voltage (WBCV) similar to EN 60268-7, subclause 3.3.3 but using wide
32、band signal (see EN 50332-1:2000, Clause 5) instead of 500 Hz sinusoidal input to characterise the necessary input level for an output sound pressure level of the headphone of 94 dB (re 20 Pa) NOTE For more definitions, see Part 1 of this standard, EN 60268-7 and the basic standards for electroacous
33、tics. 4 Basic conditions for specifications and measurements For basic conditions on measurements of the maximum sound pressure level, reference is made to EN 50332-1. 5 Player characteristics and methods of measurement 5.1 Maximum output voltage V mThe maximum output voltage of the player is a wide
34、 band value measured at the headphone output under the conditions given in 5.2. 5.2 Method of measurement and conditions 5.2.1 Input signal The player input signal shall be as specified in Part 1, Clause 5 recorded on the relevant medium with the specified level. 5.2.2 Operating conditions Devices u
35、nder test shall be powered by a stabilised power supply, at their nominal supply voltage with a tolerance of 3 %. When testing, all controls shall be adjusted to the maximum sound pressure level. For example: - noise reduction system : OFF; - volume control : maximum; - tone control : adjusted in or
36、der to maximise the sound pressure level. Player output shall be loaded with a resistive load of 32 . NOTE The load of 32 takes into account the fact that some devices derive the headphone output from a higher voltage over an internal resistor of e.g. 50 . These devices would result in too high outp
37、ut voltage at no load measurement condition. 5.2.3 Method of measurement The measuring instruments shall conform to EN 60804, class 1. The maximum output voltage V m shall be defined as unweighted true r.m.s. voltage at the load, using an averaging time of 30 s or more. Copyright European Committee
38、for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS 5 EN 50332-2:2003 6 Headphone/Earphone characteristics and methods of measurement 6.1 Wide band characteristic voltage (WBCV) This character
39、istic is defined in 3.3. NOTE The limit value of WBCV corresponds with the SPL limitL Aeqmax and the maximum output voltageV max by the equation VWBCV =V max / 10 exp (L Aeqmax - 94)/20). 6.2 Method of measurement arrangement and conditions 6.2.1 Input signal The test signals shall be program simula
40、tion noise as defined in IEC 60268-1. Further details are given in EN 50332-1:2000, subclause 5.1. 6.2.2 Source impedance The output impedance of the test signal source shall be 2 . 6.2.3 Head and Torso Simulator (HATS) The acoustical measurements are preferably done by using a suitable HATS (see al
41、so EN 50332-1:2000, subclause 6.1). For reasons to change to other devices see Clause 4. 6.2.4 Headphones/earphones fit Headphones/earphones shall be positioned on the HATS correctly, so that the measured sound pressure level is maximised. The manufacturers instructions for correct use have to be ta
42、ken into account. 6.2.5 Measurement and evaluation See EN 50332-1:2000, subclause 6.4. The characteristic voltage WBCV is the input signal voltage when sound pressure level reaches 94 dB SPL. Within guaranteed linear operation of the headphone the value can be calculated from results with other SPL
43、output. 7 Limits The values given in Table 1 are as well given for defined operation of headphones at battery operated sources as for a limitation of the maximum sound pressure level at the ear. Table 1 Limits Player Headphone Maximum output voltage 150 mV Wide band characteristic voltage 75 mV Copy
44、right European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHS - - -EN 50332-2:2003 6 8 Classification of the characteristics to be specified Data which shall be labelled on the
45、product or in the accompanying manualare given in Table 2. Table 2 Classification of the characteristics to be specified Subclause Characteristics Products 5.1 Maximum output voltage Players 6.1 Wide band characteristic voltage Headphones Copyright European Committee for Electrotechnical Standardiza
46、tion Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted without license from IHSblank Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for Resale No reproduction or networking permitted wit
47、hout license from IHSBS EN 50332-2:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Ro
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