1、 IEC 61669 Edition 2.0 2015-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Measurement of real-ear acoustical performance characteristics of hearing aids lectroacoustique Mesure des caractristiques de performances acoustiques des appareils de correction auditive sur une oreille rell
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20、cs of hearing aids lectroacoustique Mesure des caractristiques de performances acoustiques des appareils de correction auditive sur une oreille relle INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 17.140.50 ISBN 978-2-8322-2994-1 Registered trademark of the
21、International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 61669:2
22、015 IEC 2015 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 8 4 Test setup diagrams 13 5 Limitations . 15 6 Test equipment 16 6.1 Safety requirements 16 6.2 Ambient conditions 16 6.3 Test signal 16 6.4 Sound field source 17 6.5 Coupled sound source
23、17 6.6 Test signal range 17 6.7 Test signal level indication 17 6.8 Equalization 17 6.9 Frequency . 17 6.10 Harmonic distortion . 17 6.11 Probe microphone measurement . 17 6.12 Noise floor of probe microphone measurement . 17 6.13 Attenuation of probe microphone to external signals . 18 6.14 Analysi
24、s characteristics. 18 6.15 Output indication . 18 6.16 Graphical printout . 18 7 Test conditions 19 7.1 Ambient conditions in the test space . 19 7.2 Background noise . 19 7.3 Acoustical properties 19 7.4 Sound field characteristics 19 7.5 Calibration 19 7.6 Equalization 19 7.6.1 General . 19 7.6.2
25、Substitution method . 19 7.6.3 Modified pressure method Stored equalization 20 7.6.4 Modified pressure method Concurrent equalization . 20 7.7 Test signal level 20 7.8 Location of the subject 20 7.9 Location of the tester 20 7.10 Location of the field reference point 20 7.11 Location of the measurem
26、ent point . 21 7.12 Instructions to the subject . 21 7.13 Location and coupling of the hearing aid . 21 7.14 Operating conditions for the hearing aid 21 8 Measurements . 21 8.1 General . 21 IEC 61669:2015 IEC 2015 3 8.2 Real-ear unaided response (REUR) curve. 21 8.3 Real-ear unaided gain (REUG) curv
27、e 22 8.4 Real-ear occluded response (REOR) curve . 22 8.5 Real-ear occluded gain (REOG) curve 22 8.6 Real-ear aided response (REAR) curve. 22 8.7 Real-ear aided gain (REAG) curve 23 8.8 Real-ear insertion gain (REIG) curve 23 8.9 Real-ear to coupler difference (RECD) curve 23 8.10 Real-ear to dial d
28、ifference (REDD) curve 23 9 Measurement uncertainty for the performance requirements of Clause 6 . 24 Annex A (informative) Positioning the probe microphone sound inlet at the measurement point . 25 A.1 General . 25 A.2 Visual positioning 25 A.3 Acoustically-assisted positioning . 25 A.4 Acoustic po
29、sitioning Method 1 26 A.5 Acoustic positioning Method 2 26 A.6 Geometrical positioning 26 Annex B (informative) Issues in RECD measurement and application 27 B.1 General . 27 B.2 Influence of the coupled sound source 27 B.3 Estimating ear canal SPL produced by a hearing aid. 30 B.4 Correcting an HL
30、audiogram obtained with an insert earphone and a standard eartip 32 B.5 Correcting an HL audiogram obtained with an insert earphone and a custom earmould. 32 Annex C (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of meas
31、urement . 34 Bibliography 35 Figure 1 Test set-up . 14 Figure 2 Real-ear measurement arrangement 15 Figure B.1 Computer-simulated ECLD for an average adult ear . 29 Figure B.2 Computer-simulated ECLD for an average 3-month old childs ear 29 Figure B.3 Computer-simulated error in estimating SPL in an
32、 average adult ear 31 Figure B.4 Computer-simulated error in estimating SPL in an average 3-month old childs ear . 31 Figure B.5 Computer-simulated HL correction for an average 3 month old childs ear . 33 Figure C.1 Relationship between tolerance interval, corresponding acceptance interval and the m
33、aximum permitted uncertainty of measurement . 34 Table 1 Tolerance limits, acceptance limits and U maxfor basic measurements . 24 4 IEC 61669:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS MEASUREMENT OF REAL-EAR ACOUSTICAL PERFORMANCE CHARACTERISTICS OF HEARING AIDS FORE
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44、 that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61669 has been prepared by IEC technical committee 29: Electroacoustics. This second edition cancels and
45、 replaces the first edition of IEC 61669:2001 and the first edition of ISO 12124:2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61669:2001 and ISO 12124:2001: a) the addition of the International Speech Test
46、Signal as a preferred speech-like stimulus; b) definitions and test methods for the real-ear to dial difference; c) definitions and test methods for the real-ear to coupler difference and d) an annex dealing with issues in the measurement and application of the real-ear to coupler difference; IEC 61
47、669:2015 IEC 2015 5 The text of this standard is based on the following documents: FDIS Report on voting 29/886/FDIS 29/893/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in acc
48、ordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will b
49、e reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC 61669:2015 IEC 2015 INTRODUCTION The performance characteristics of hearing aids in actual use can differ significantly from those determined in accordance with standards such as IEC 60118-0, and IEC 60118-7, due to differing acoustic influence and coupling presented by individual ears. Measuring methods that take into account the acousti
