1、BRITISH STANDARD BS EN ISO 11904-1:2002 Incorporating Corrigendum No. 1 Acoustics Determination of sound immission from sound sources placed close to the ear Part 1: Technique using a microphone in a real ear (MIRE technique) The European Standard EN ISO 11904-1:2002 has the status of a British Stan
2、dard ICS 17.140.01 BS EN ISO 11904-1:2002 This British Standard, having been prepared under the direction of the Health and Environment Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 24 October 2002 BSI 6 December 2002 ISBN 0
3、 580 40617 2 National foreword This British Standard is the official English language version of EN ISO 11904-1:2002. It is identical with ISO 11904-1:2002. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to Subcommittee EH/1/1, Hearing, which has the re
4、sponsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitl
5、ed “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 provisions of a contract. Users are responsible for its correct application. Compliance
6、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 interpretation, or proposals for change, and keep the UK interests informed; monitor related inter
7、national and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to vi, pages 1 to 20, the Annex ZA page and a back cover. The BSI copyright d
8、ate displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 14258 Corrigendum No. 1 6 December 2002 Replacing the EN ISO foreword page and incorporating the Annex ZA pageEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO119
9、041 October2002 ICS17.140.01 Englishversion AcousticsDeterminationofsoundimmissionfromsound sourcesplacedclosetotheearPart1:Techniqueusinga microphoneinarealear(MIREtechnique)(ISO119041:2002) AcoustiqueDterminationdelexpositionsonoredue dessourcessonoresplacesproximitdeloreillePartie 1:Techniquedumi
10、crophoneplacdansuneoreillerelle (techniqueMIRE)(ISO119041:2002) AkustikBestimmungderSchallimmissionvonohrnahen SchallquellenTeil1:VerfahrenmitMikrofonenin menschlichenOhren(MIREVerfahren)(ISO119041:2002) ThisEuropeanStandardwasapprovedbyCENon29August2002. CENmembersareboundtocomplywiththeCEN/CENELEC
11、InternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeof
12、ficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,Franc
13、e,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationina
14、nyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO119041:2002ECORRECTED20021113 Foreword Thisdocument(ENISO119041:2002)hasbeenpreparedbyTechnicalCommitteeISO/TC43 “Acoustic“incollaborationwithTechnicalCommitteeCEN/TC211“Acoustics“,thesecretariatof whichisheldbyDS. ThisEuropeanS
15、tandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbyApril2003,andconflictingnational standardsshallbewithdrawnatthelatestbyApril2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcountriesar
16、eboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg, Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom. Endorsementnotice ThetextofISO119041:2002hasbeenapprovedbyCENasENISO119041:2002w
17、ithoutany modifications. NOTENormativereferencestoInternationalStandardsarelistedinAnnexZA(normative). ENISO119041:2002 Reference number ISO 11904-1:2002(E)INTERNATIONAL STANDARD ISO 11904-1 First edition 2002-10-01 Acoustics Determination of sound immission from sound sources placed close to the ea
18、r Part 1: Technique using a microphone in a real ear (MIRE technique) Acoustique Dtermination de lexposition sonore due des sources sonores places proximit de loreille Partie 1: Technique du microphone plac dans une oreille relle (technique MIRE) ENISO119041:2002IS-40911 O1:(2002E) DPlcsid Fremia ih
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23、eh.re ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mial coirypthgis.oc h Web ww.wiso.ch ii I SO 2002 Allr ithgsr esedevrENISO119041:2002iiIS-40911 O1:(2002E) I SO 2002 All irthgs ersedevr iiiContents Page Foreword iv Introduction. v 1 Scope
24、1 2 Normative references 1 3 Terms and definitions. 2 4 Measurement principle. 3 5 Instrumentation. 3 5.1 Ear canal microphone. 3 5.2 Reference field microphone. 4 5.3 Check of calibration 4 5.4 Filters 4 6 Subjects 4 7 Use of ear canal microphone . 4 7.1 Choice of ear canal measurement position 4 7
25、.2 Mounting of microphones 6 7.3 Safety 6 8 Determination of free-field or diffuse-field related equivalent continuous A-weighted sound pressure level 6 8.1 Measurement of ear canal sound pressure level. 6 8.2 Conversion to free-field or diffuse-field related sound pressure level 7 8.3 A-weighting a
26、nd summation 7 9 Free-field and diffuse-field frequency responses for selected ear canal measurement positions 7 10 Determination of free-field or diffuse-field frequency responses 7 10.1 General. 7 10.2 Measurement principle. 9 10.3 Establishment of a free reference sound field . 9 10.4 Establishme
27、nt of a quasi-free reference sound field 9 10.5 Establishment of a diffuse reference sound field 9 10.6 Measurement of the reference sound field. 9 10.7 Measurement of ear canal sound pressure level in reference sound field . 9 10.8 Determination of free-field or diffuse-field frequency response10 1
28、0.9 Simplifications in specific cases . 10 10.10 Optional check of the measurement arrangement 10 11 Test report 10 Annex A (informative) Example of sources of measurement uncertainty 11 Annex B (informative) Example of an uncertainty analysis . 17 Bibliography 19 ENISO119041:2002iiiIS-40911 O1:(200
29、2E) vi I SO 2002 All irthgs ersedevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body i
30、nterested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechn
31、ical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by th
32、e technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
33、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11904-1 was prepared by Technical Committee ISO/TC 43, Acoustics. ISO 11904 consists of the following parts, under the general title Acoustics Determination of sound immission from sound sources plac
34、ed close to the ear: Part 1: Technique using a microphone in a real ear (MIRE technique) Part 2: Technique using a manikin (manikin technique) Annexes A and B of this part of ISO 11904 are for information only. ENISO119041:2002ivIS-40911 O1:(2002E) I SO 2002 All irthgs ersedevr vIntroduction ISO 119
35、04 is a series of standards which specify methods for the determination of sound immissions from sources located close to the ear, in which situations the sound pressure level measured at the position of the exposed person (but with the person absent) does not adequately represent the sound exposure
36、. In order to make it possible to assess the exposure by means of well established criteria, the exposure of the ear is measured and subsequently converted into a corresponding free-field or diffuse-field level. The result is given as free-field related or diffuse-field related equivalent continuous
37、 A-weighted sound pressure level, L FF , H,Aeqor L DF,H,Aeqwhen ISO 11904-1 is used, or L FF,M,Aeqor L DF,M,Aeqwhen ISO 11904-2 is used. ISO 11904-1 describes measurements carried out using miniature or probe microphones inserted in the ears of human subjects (microphone in real ear, MIRE technique)
38、. ISO 11904-2 describes measurements carried out using a manikin equipped with ear simulators including microphones (manikin technique). ISO 11904 may, for instance, be applied to equipment tests and the determination of noise exposure at the workplace where, in the case of exposure from sources clo
39、se to the ears, the sound pressure level measured at the position of the exposed person (but with the person absent) does not adequately represent the sound exposure. Examples of applications are head- and earphones used to reproduce music or speech, whether at the workplace or during leisure, nailg
40、uns used close to the head, and combined exposure from a close-to-ear sound source and an external sound field. When specific types of equipment are to be tested (e.g. portable cassette players or hearing protectors provided with radio receivers), test signals suitable for this particular type of eq
41、uipment have to be used. Neither such test signals nor the operating conditions of the equipment are included in ISO 11904 but might be specified in other standards. When workplace situations are measured, the various noise sources contributing to the immission should be identified. Operating condit
42、ions for machinery and equipment used might be specified in other standards. Both parts of ISO 11904 strive for the same result: a mean value for a population of the free-field or the diffuse-field related level. ISO 11904-1 does this by specifying the mean of measurements on a number of human subje
43、cts; ISO 11904-2 does this by using a manikin, which aims at reproducing the acoustical effects of an average human adult. However, the two methods yield different measurement uncertainties which can influence the choice of method. Only the method described in ISO 11904-1 gives results which indicat
44、e the variance in a human population. Information on the uncertainties is given in annexes A and B. When using the MIRE technique for measurement of sound from earphones of insert and stethoscopic types, practical problems can occur with the positioning of microphones in the ear canal. When using th
45、e manikin technique, the head- or earphone has to be coupled to the pinna simulator and ear canal extension as far as possible in the way it is coupled to the human ear. In cases where head- or earphones or other objects touch the pinna, a possible deviation in stiffness or shape of the artificial p
46、inna from human pinnae has a significant impact on the result and can even make the results invalid. An overview of the differences of the two parts of ISO 11904 is given in Table 0.1. ENISO119041:2002vIS-40911 O1:(2002E) iv I SO 2002 All irthgs ersedevrTable 0.1 Overview of differences between MIRE
47、 and manikin techniques Parameter ISO 11904-1 ISO 11904-2 Type of method Microphone in real ear technique Manikin technique Limitation of the method With earphones of insert and stethoscopic type, practical problems can occur with positioning of microphones in the ear canal. A proper coupling may no
48、t always be obtained if the artificial pinna deviates from human pinnae in stiffness or shape. In some cases the exposed person cannot be replaced by a manikin, e.g. if the person has to operate equipment. Main issues affecting accuracy Number of subjects When tabulated values are used for L FF,Hor L DF,H : calib
