1、BSI Standards PublicationBS EN 50332-2:2013Sound system equipment: Headphones and earphones associated with personal music players Maximum sound pressure level measurement methodologyPart 2: Matching of sets with headphones if either or both are offered separately, or are offered as one package equi
2、pment but with standardised connectors between the two allowing to combine components of differ-ent manufacturers or different designBS EN 50332-2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50332-2:2013. It supersedes BS EN 50332-2:2003, which will be
3、withdrawn on 23 September 2016.The UK participation in its preparation was entrusted to Technical Committee EPL/108, Safety of electronic equipment within the field of audio/video, information technology and communication technology.A list of organizations represented on this committee can be obtain
4、ed on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013ISBN 978 0 580 82737 2ICS 17.140.50; 33.160.50Comp
5、liance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2013.Amendments/corrigenda issued since publicationDate Text affectedBS EN 50332-2:2013EUROPEAN STANDARD E
6、N 50332-2 NORME EUROPENNE EUROPISCHE NORM October 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - Al
7、l rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50332-2:2013 E ICS 17.140.50; 33.160.50 Supersedes EN 50332-2:2003 English version Sound system equipment: Headphones and earphones associated with personal music players - Maximum sound pressur
8、e level measurement methodology - Part 2: Matching of sets with headphones if either or both are offered separately, or are offered as one package equipment but with standardised connectors between the two allowing to combine components of different manufacturers or different design Equipement de sy
9、stmes acoustiques: Casques et couteurs associs avec un baladeur - Mthode de mesure de niveau maximal de pression acoustique - Part 2 : Adaptation des quipements avec des couteurs provenant de diffrents fabricants, ou provenant dun quipement complet mais avec des connecteurs normaliss entre les deux,
10、 permettant dassocier des composants provenant de diffrents fabricants ou bien de conception diffrente Elektroakustische Gerte: Kopfhrer und Ohrhrer in Verbindung mit tragbaren Audiogerten - Verfahren zur Messung des maximalen Schalldruckpegels - Teil 2: Anpassung von Gerten und Kopfhrern, wenn eine
11、 der beiden oder beide Komponenten getrennt angeboten werden This European Standard was approved by CENELEC on 2013-09-23. 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
12、without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in an
13、y other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia,
14、 Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey a
15、nd the United Kingdom. BS EN 50332-2:2013EN 50332-2:2013 - 2 - Contents Page Foreword 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions 4 4 Basic conditions for specifications and measurements 5 5 Player characteristics and methods of measurement 5 5.1 Maximum output voltage Vm. 5 5.2
16、 Method of measurement and conditions 5 5.2.1 Input signal . 5 5.2.2 Operating conditions . 5 5.2.3 Method of measurement for analogue audio outputs . 5 5.2.4 Method of measurement for digital audio outputs . 5 6 Headphone/Earphone characteristics and methods of measurement . 6 6.1 Measuring equipme
17、nt 6 6.2 Simulated programme signal characteristic voltage . 6 6.3 Method of measurement arrangement and conditions . 6 6.3.1 Input signal . 6 6.3.2 Source impedance of analogue input devices . 6 6.3.3 Acoustical measurement method 6 6.3.4 Headphones/earphones fit . 6 6.3.5 Measurement and evaluatio
18、n . 6 Annex A (informative) Example test procedure for acoustic safety of listening devices . 7 A.1 Acoustic coupling between listening devices receiver and the ear simulator on HATS (head and torso simulator) 7 A.1.1 General 7 A.1.2 Circum-aural, Supra-aural and Supra-concha listening devices 7 A.1
19、.3 Intra-concha listening devices . 7 A.1.4 Insert type listening devices 7 A.2 Measurement and Analysis (General) . 7 A.3 Corded analogue listening device . 8 A.4 Corded digital listening device 8 A.5 Cordless digital listening device 8 A.6 Listening device with multiple operating modes . 8 Bibliog
20、raphy . 9 BS EN 50332-2:2013- 3 - EN 50332-2:2013 Foreword This document (EN 50332-2:2013) has been prepared by CLC/TC 108X, “Safety of electronic equipment within the fields of Audio/Video, Information Technology and Communication Technology“. The following dates are fixed: latest date by which thi
21、s document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-09-23 latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2016-09-23 This document supersedes EN 50332-2:2003. EN 50332-2
22、:2013 includes the following significant technical changes with respect to EN 50332-2:2003: - deletion of limits; - addition of digital signals; - adaptations to use the term “personal music players“. EN 50332, Sound system equipment: Headphones and earphones associated with personal music players M
23、aximum sound pressure level measurement methodology, is composed with the following parts: Part 1: General method for “one package equipment“; Part 2: Matching of sets with headphones if either or both are offered separately, or are offered as one package equipment but with standardised connectors b
24、etween the two allowing to combine components of different manufacturers or different design. The 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 play
25、ers or headphones with standardised sockets and plugs are arbitrarily combined. This Part 2 provides measurement methods for the matching values which guarantee the SPL limit also for the aforementioned condition. _ BS EN 50332-2:2013EN 50332-2:2013 - 4 - 1 Scope This Part 2 of EN 50332 specifies me
26、thods of measuring the matching values for the use of personal music players and headphones/earphones defined for the use with those and with standardised connectors or interfaces allowing to combine components of different manufacturers or different design sold separately in order to avoid possible
27、 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 condition but needs at least two characteristics, one each for player and the headphones/earphones, defined by the matching values for
28、 their connection. Requirements for protection against excessive sound pressure from personal music players are given in EN 60950-1:2006/A12:2011 and EN 60065:2002/A12:2011. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indis
29、pensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. HD 483.1 S2, Sound system equipment Part 1: General (IEC 60268-1) EN 50332-1:2013, Sound system equipment: Hea
30、dphones and earphones associated with personal music players Maximum sound pressure level measurement methodology Part 1: General method for “one package equipment“ EN 60268-7:2011, Sound system equipment Part 7: Headphones and earphones (IEC 60268-7:2010) EN 61260, Electroacoustics Octave-band and
31、fractional-octave-band filters (IEC 61260) EN 61672-1, Electroacoustics Sound level meters Part 1: Specifications (IEC 61672-1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE For more definitions, see EN 50332-1:2013, EN 60268-7:2011 and th
32、e basic standards for electroacoustics. 3.1 portable audio headphones and earphones headphones and earphones, which are intended to be used with personal music players and to be mainly used for listening to the music outdoors 3.2 simulated programme signal characteristic voltage SPCV The input volta
33、ge for a wide band signal at an output SPL of 94 dB, defined in EN 60268-7:2011, 8.3.4. BS EN 50332-2:2013- 5 - EN 50332-2:2013 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 c
34、haracteristics and methods of measurement 5.1 Maximum output voltage VmThe maximum output voltage of the player is a wide 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 spe
35、cified in EN 50332-1:2013, Clause 5 recorded on the relevant medium with the specified level. 5.2.2 Operating conditions During the test, the power source used shall not deviate more than 3 %. When testing, all controls shall be adjusted to the maximum sound pressure level. For example: - noise redu
36、ction system : OFF; - volume control : all hardware, operating system, and application volume and gain settings exposed to a normal user shall be activated and maximised; - tone control : all frequency equalisation settings exposed to a normal user shall be activated and adjusted to maximise the sou
37、nd pressure level. All hardware and software processing systems, gain and tone control settings shall be set such as to reach the maximum sound level output. The analogue audio output shall be loaded with a resistive load of 32 per channel. NOTE The load of 32 takes into account the fact that some d
38、evices derive the headphone output from a higher voltage over an internal resistor of for example 50 . These devices would result in too high output voltage at no load measurement condition. 5.2.3 Method of measurement for analogue audio outputs The measuring instruments shall conform to: - EN 61672
39、-1, class 1 (for sound level meters); - EN 61260, class 1 (for 1/3 octave analysers). The maximum output voltage Vmshall be defined as unweighted r.m.s. voltage at the load, using an averaging time of 30 s or more. 5.2.4 Method of measurement for digital audio outputs The maximum output level, Lmsha
40、ll be defined as an average of digital signal, using an averaging time of 30 s or more. The digital input test signal is defined in EN 50332-1 as -10 dBFS. Digital player outputs should provide corresponding values for safety reason (see EN 60950-1, EN 60065 and EN 62368-1). BS EN 50332-2:2013EN 503
41、32-2:2013 - 6 - 6 Headphone/Earphone characteristics and methods of measurement 6.1 Measuring equipment The measuring equipment shall be in accordance with EN 61672-1 when connected with a HATS microphone. It shall specifically comply with the requirement for “an integrating-averaging sound level me
42、ter that measures time-average sound level. 6.2 Simulated programme signal characteristic voltage This characteristic is defined in 3.2. 6.3 Method of measurement arrangement and conditions 6.3.1 Input signal The test signals shall be the programme simulation noise as defined in HD 483.1 S2. Further
43、 details are given in the respective subclauses of EN 50332-1:2013, Clause 5. 6.3.2 Source impedance of analogue input devices The output impedance of the test signal source shall be 2 . 6.3.3 Acoustical measurement method The acoustical measurements are done by using a suitable HATS as defined in E
44、N 50332-1:2013, 4.2. 6.3.4 Headphones/earphones fit Headphones/earphones shall be positioned on the measuring device correctly, so that the measured sound pressure level is maximised. The manufacturers instructions for correct use have to be taken into account. The headphones/earphones intended to b
45、e connected to a player are currently binaural. However, the monaural headphones/earphones are also within the scope of the standard. They will be placed on the HATS according to the principles described in EN 50332-1:2013, 6.2. It shall be checked that the position of the headphones/earphones on th
46、e HATS corresponds to the maximum signal level measured by the HATS. For binaural headphones/earphones both left and right are measured. 6.3.5 Measurement and evaluation See EN 50332-1:2013, 6.4. The simulated programme signal characteristic voltage of analogue headphone input is the input signal vo
47、ltage when the sound pressure level reaches 94 dB SPL A-weighted. Within guaranteed linear operation of the headphone/earphone the value can be calculated from results with other SPL output. The LAeq,Tof a digital headphone/earphone input is the acoustic output sound pressure level measured in the t
48、est protocol of EN 50332-1:2013, Clause 6 with the input signal as defined in 6.3.1 of this standard. BS EN 50332-2:2013- 7 - EN 50332-2:2013 Annex A (informative) Example test procedure for acoustic safety of listening devices A.1 Acoustic coupling between listening devices receiver and the ear sim
49、ulator on HATS (head and torso simulator) A.1.1 General a) All listening devices shall be coupled to the ear in a way that closely approximates real use. Refer to the listening devices user guide for the recommend use position or intended usage. b) No extra force shall be used in any of listening device coupling. c) All tests shall be repeated as given in EN 50332-1:2013, 6.4. A.1.2 Circum-aural, Supra-aural and Supra-concha listening devices a) If there is a headband, it shall be extended to the length that it lightl
