1、 IEC 60318-3 Edition 2.0 2014-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Simulators of human head and ear Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry lectroacoustique Simulateurs de tte et doreille humaines Partie 3: Coupleur acoustiq
2、ue pour ltalonnage des couteurs supra-auraux utiliss en audiomtrie IEC 60318-3:2014-12(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by a
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20、coustics Simulators of human head and ear Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry lectroacoustique Simulateurs de tte et doreille humaines Partie 3: Coupleur acoustique pour ltalonnage des couteurs supra-auraux utiliss en audiomtrie INTERNATIONAL ELEC
21、TROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE M ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1930-0 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this
22、 publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 60318-3:2014 IEC 2014 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 Construction 5 4.1 General . 5 4.2 Cavity dim
23、ensions . 6 4.3 Static pressure equalization 8 4.4 Calibrated pressure type microphone 8 5 Coupling of earphone to acoustic coupler 9 6 Calibration . 9 6.1 Reference environmental conditions . 9 6.2 Method of calibration 10 7 Maximum permitted uncertainty of measurements . 10 Bibliography 12 Figure
24、1 Dimensions of acoustic coupler 7 Figure 2 Coupling of earphone to coupler. 9 Table 1 Height of the coupler as a function of the acoustic volume of the microphone 8 Table 2 Values of maximum permitted uncertainties U maxfor a level of confidence of approximately 95 % 11 IEC 60318-3:2014 IEC 2014 3
25、INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS SIMULATORS OF HUMAN HEAD AND EAR Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization compr
26、ising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Stand
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32、nal publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out b
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34、or any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the No
35、rmative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held res
36、ponsible for identifying any or all such patent rights. International Standard IEC 60318-3 has been prepared by IEC technical committee 29: Electroacoustics. This second edition cancels and replaces the first edition published in 1998 and constitutes a technical revision. This edition includes the f
37、ollowing significant technical changes with respect to the previous edition: a) adjustment of terms and wording to the other parts of IEC 60318, b) introduction of maximum permitted uncertainties, c) revised requirements for static pressure equalization. 4 IEC 60318-3:2014 IEC 2014 The text of this
38、standard is based on the following documents: CDV Report on voting 29/796/CDV 29/811A/RVC 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 accordance with the ISO/IEC Directives, P
39、art 2. A list of all the parts in the IEC 60318 series, published under the general title Electroacoustics Simulators of human head and ear can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the
40、 IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IEC 60318-3:2014 IEC 2014 5 ELECTROACOUSTICS SIMULATORS OF HUMAN HEAD AND EAR Part 3: Acoustic coupler
41、 for the calibration of supra-aural earphones used in audiometry 1 Scope This part of IEC 60318 specifies an acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz. The sound pressure developed by an earphone is not, in general, the s
42、ame in the coupler as in a persons ear. However, the acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels (RETSPL) for the calibration of audiometers. 2
43、 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
44、ents) applies. IEC 61094-1, Measurement microphones Part 1: Specifications for laboratory standard microphones ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) 3 Terms and definitions For the purpose of this document, the followi
45、ng definition applies: 3.1 acoustic coupler device for measuring the acoustic output of sound sources where the sound pressure is measured by a calibrated microphone coupled to the source by a cavity of predetermined shape and volume which does not necessarily approximate the acoustical impedance of
46、 the normal human ear 4 Construction 4.1 General The coupler consists essentially of a cylindrical cavity whose acoustic transfer impedance is determined by the volume of air in the cavity and its dimensions (see 4.2). A microphone with a diaphragm having high acoustic impedance is located in the ba
47、se of the cylindrical cavity. The coupler shall be made of a material that has no negative influences on its performance. For example it should be acoustically hard and dimensionally stable. The general construction 6 IEC 60318-3:2014 IEC 2014 of the coupler and mounting of the microphone shall aim
48、to reduce the response to vibration of any earphone or to sound outside the cavity. In the following, the specified tolerance shall be reduced by an amount equal to the actual expanded measurement uncertainty of the test laboratory before deciding if a device conforms to this specification. 4.2 Cavi
49、ty dimensions The critical dimensions (see Figure 1) of the coupler are those that determine the shape and volume of the cavity terminated by the microphone, the static pressure equalization mechanism, the upper edge (lip) and the 45 angle. The effective acoustic volume of the coupler shall be 5 780 mm 3 130 mm 3 . The diameter d 1shall be 23,825 mm 0,080 mm. Diameter d 2shall be 18,55 mm 0,16 mm
