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1、BRITISH STANDARD BS EN 60118-8:2005 Electroacoustics Hearing aids Part 8: Methods of measurement of performance characteristics of hearing aids under simulated in situ working conditions The European Standard EN 60118-8:2005 has the status of a British Standard ICS 17.140.50 ? Licensed Copy: sheffie
2、ldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60118-8:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 February 2006 BSI 14 February 2006 ISBN 0 580 47662 6 National foreword This British St
3、andard is the official English language version of EN 60118-8:2005. It is identical with IEC 60118-8:2005. It supersedes The UK participation in its preparation was entrusted to Technical Committee EPL/29, Electroacoustics, which has the responsibility to: A list of organizations represented on this
4、 committee 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 entitled “International Standards Correspondence Index”, or by using
5、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 with a British Standard does not of itself confer immunity from
6、 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 UK interests informed; monitor related international and European developments and promulgate them in the UK. S
7、ummary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 32, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateCom
8、ments BS 6083-8:1985 which is withdrawn. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60118-8 NORME EUROPENNE EUROPISCHE NORM December 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen
9、 de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60118-8:2005 E ICS 17.140.50 Engli
10、sh version Electroacoustics Hearing aids Part 8: Methods of measurement of performance characteristics of hearing aids under simulated in situ working conditions (IEC 60118-8:2005) Electroacoustique Appareils de correction auditive Partie 8: Mthodes de mesure des caractristiques fonctionnelles des a
11、ppareils de correction auditive dans des conditions simules de fonctionnement in situ (CEI 60118-8:2005) Akustik Hrgerte Teil 8: Verfahren zur Messung der bertragungseigenschaften von Hrgerten unter simulierten In-Situ-Bedingungen (IEC 60118-8:2005) This European Standard was approved by CENELEC on
12、2005-12-01. 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 alteration. Up-to-date lists and bibliographical references concerning such national standards may
13、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 translation under the responsibility of a CENELEC member into its own language and notified to t
14、he Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, N
15、etherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of document 29/584/FDIS, future edition 2 of IEC 60118-8, prepared by
16、IEC TC 29, Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60118-8 on 2005-12-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
17、(dop) 2006-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-12-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60118-8:2005 was approved by CENELEC as a European Standard without any modif
18、ication. _ EN 60118-8:2005 2 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 EN 60118-8:2005 CONTENTS INTRODUCTION.5 1 Scope 6 2 Normative references .6 3 Terms and definitions .6 4 Limitations10 5 Test equipment.11 5.1 Acoustical requirem
19、ents for the test space .11 5.2 Sound source 11 5.3 Manikin .12 5.4 Ear simulator.12 5.5 Ear insert simulator .12 5.6 Equipment for the measurement of occluded-ear simulator sound pressure level12 5.7 Equipment for automatic sweep frequency recording 13 5.8 Equipment for calibration of free field so
20、und pressure level 13 6 Test conditions.13 6.1 Choice of test point13 6.2 Ambient conditions 13 6.3 Manikin .13 6.4 Location of the hearing aid.14 6.5 Normal operating conditions for the hearing aid14 7 Measurements15 7.1 General.15 7.2 Adjustment of the reference input sound pressure level 15 7.3 M
21、anikin frequency response (MFR)15 7.4 Full-on simulated insertion gain measured by the constant reference input SPL method 16 7.5 Full-on simulated insertion gain measured by the constant ear simulator SPL method16 7.6 Directional characteristics17 7.7 Simulated in situ OSPL90 measurements.19 7.8 Si
22、mplified method to measure simulated in situ and insertion gain response .20 8 Frequency response recording charts20 9 Maximum permitted expanded uncertainty of measurements .20 Annex A (normative) Free-field to hearing-aid-microphone transformation.22 Annex B (normative) Manikin unoccluded-ear gain
23、 (open ear response).26 Annex C (informative) General requirements for a manikin28 Annex ZA (normative) Normative references to international publications with their corresponding European publications32 Bibliography .31 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006,
24、 Uncontrolled Copy, (c) BSI EN 60118-8:2005 4 Figure A.1 Microphone location and corresponding free-field to hearing-aid- microphone transformation for behind-the-ear instruments.23 Figure A.2 Microphone location and corresponding free-field to hearing-aid- microphone transformation for full-concha
25、instruments 23 Figure A.3 Microphone location and corresponding free-field to hearing-aid- microphone transformation for canal size instruments24 Figure A.4 Microphone location and corresponding free-field to hearing-aid- microphone transformation for completely-in-the-ear canal instruments.24 Figur
26、e B.1 Manikin unoccluded-ear gain frequency response 26 Figure C.1 Manikin geometrical references.29 Figure C.2 Co-ordinates for angles of azimuth and elevation.30 Table 1 Values of Umax for basic measurements.21 Table A.1 Numerical data for the various free-field to hearing-aid-microphone transform
27、ation responses25 Table B.1 Numerical data of manikin unoccluded-ear gain frequency response .27 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 EN 60118-8:2005 INTRODUCTION Measurement methods that take into account the acoustical influen
28、ce of the wearer on the performance of hearing aids are important, particularly when the results are to be used to assist in the fitting of hearing aids. The information obtained using this standard is likely to be more relevant to the fitting of hearing aids than that provided by publications conce
29、rned with type approval and quality control such as IEC 60118-0, and IEC 60118-7. The methods specified in this standard require a device such as a manikin to simulate the presence of the wearer. It has been found necessary to establish certain guidelines for simulated in situ measurements of hearin
30、g aids. The recommended methods are described in this standard. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60118-8:2005 6 ELECTROACOUSTICS HEARING AIDS Part 8: Methods of measurement of performance characteristics of hearing aids und
31、er simulated in situ working conditions 1 Scope The purpose of this part of IEC 60118 is to describe methods for a test which simulates the acoustical effects of a median adult wearer on the performance of a hearing aid. It establishes certain guidelines for simulated in situ measurements of hearing
32、 aids; it describes a simplified method for simulated in situ measurements of hearing aids and a description for determination of the directivity index (DI) of directional microphones in hearing aids in the horizontal plane. In addition this second edition now specifies tolerances. Conformance to th
33、e specifications in this International Standard is demonstrated only when the result of a measurement, extended by the actual expanded uncertainty of measurement of the testing laboratory, lies fully within the tolerances specified in this International Standard extended by the values for Umax 2 Nor
34、mative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60118-0:1983, Hearing aids
35、Part 0: Measurement of electroacoustical characteristics IEC 60263, Scales and sizes for plotting frequency characteristics and polar diagrams IEC 60711, Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts IEC 60959, Provisional head and torso simulator for acou
36、stic measurements of air conduction hearing aids 3 Terms and definitions For the purpose of this document, the following definitions apply: Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 7 EN 60118-8:2005 3.1 sound pressure level throughout
37、 this standard all sound pressure levels (abbreviated SPL) are referred to 20 Pa 3.2 pinna simulator device which has the approximate shape and dimensions of a median adult human pinna 3.3 ear simulator device for measuring the output sound pressure level of an earphone under well defined loading co
38、nditions in a specified frequency range. It consists essentially of a principal cavity, acoustic load networks and a calibrated microphone. The location of the microphone is chosen so that the sound pressure at the microphone corresponds approximately to the sound pressure existing at the human eard
39、rum 3.4 occluded-ear simulator ear simulator which simulates the inner part of the ear canal, from the tip of an ear insert to the eardrum 3.5 ear canal extension device which connects the concha portion of the pinna simulator with the outer (reference plane) face of the occluded-ear simulator, simu
40、lating the outer part of the ear canal excluding the pinna 3.6 ear insert simulator device used to represent the acoustic coupling between an earphone and the ear canal (e.g. an earmould or a similar device without a connecting tube) 3.7 manikin (head and torso simulator) head and torso simulator ex
41、tending downward from the top of the head to the waist and designed to simulate the acoustic diffraction produced by a median adult human head and torso. The head includes two pinna simulators, and contains at least one occluded-ear simulator 3.8 reference point of a subject or manikin point bisecti
42、ng the line joining the centres of the openings of the ear canals (at the junction between concha and ear canal) (see Figure C.1) 3.9 plane of symmetry of the manikin plane passing through the reference point of the manikin that divides the left and right portions of the manikin into symmetrical hal
43、ves (see Figure C.1) 3.10 axis of rotation of the manikin straight line passing through the reference point of the manikin and lying in the plane of symmetry of the manikin, and having a direction that would be vertical if the manikin were mounted in a position corresponding to that of a standing pe
44、rson (and about which the manikin can be rotated) (see Figure C.1) Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 04:21:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60118-8:2005 8 3.11 reference plane of the manikin plane perpendicular to the axis of rotation containing the reference poi
45、nt of the manikin (see Figure C.1) 3.12 test point reproducible position in the test space at which the sound pressure level is measured with the manikin absent and at which the reference point of the manikin is to be located for test purposes 3.13 reference input sound pressure level free field sou
46、nd pressure level at the test point in the absence of the manikin 3.14 test axis line joining the test point and the centre of the sound source (see Figure C.2) 3.15 test plane (for measurement of the uniformity of the free field wavefront) plane perpendicular to the test axis and containing the tes
47、t point 3.16 azimuth angle of sound incidence angle between the plane of symmetry of the manikin and the plane defined by the axis of rotation and the test axis (see Figure C.2). When the manikin faces the sound source the azimuth angle of sound incidence is defined as 0. When the right ear of the m
48、anikin faces the sound source, the azimuth angle is defined as 90. When the left ear faces the sound source, the angle is defined as 270 3.17 elevation angle of sound incidence angle between the reference plane of the manikin and the test axis (see Figure C.2). When the top of the manikin points tow
49、ards the sound source the elevation angle is defined as 90. When the test axis lies in the reference plane, the elevation angle is defined as 0 3.18 reference position of the manikin in the test space position of the manikin in the test space that meets the following conditions: the reference point coincides with the test point, and the angles of azimuth and elevation are both equal t