1、 IEC 60645-1 Edition 4.0 2017-03REDLINE VERSIONElectroacoustics Audiometric equipment Part 1: Equipment for pure-tone and speech audiometry IEC 60645-1:2017-03 RLV(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights reserved. Unless otherwise
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10、f you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 60645-1 Edition 4.0 2017-03REDLINE VERSIONElectroacoustics Audiometric equipment Part 1: Equipment for pure-tone and speech audiometry INTERNATIONAL ELECTROT
11、ECHNICAL COMMISSION ICS 17.140.50 ISBN 978-2-8322-4111-0 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 60645-1:2017 RLV IEC 2017 CONTENTS FOREWORD . 6 INTRODUCTION . 8 1
12、Scope 10 2 Normative references 10 3 Terms and definitions 12 4 Requirements for specific types of fixed frequency by type and class of audiometer 16 5 General requirements 18 5.1 General safety requirements . 18 5.2 Acoustic safety requirements 18 5.3 Environmental conditions 18 5.4 Warm-up time .
13、18 5.5 Power supply variation 18 5.5.1 Interruption of power supply 18 5.5.2 Mains operation . 18 5.5.3 Battery operation . 18 5.5.4 Other power supplies . 19 5.6 Electromagnetic compatibility 19 5.7 Unwanted sound . 19 5.7.1 General . 19 5.7.2 Unwanted sound from and between any combination of tran
14、sducers 19 5.7.3 Unwanted sound from an earphone . 19 5.7.4 Unwanted sound from a bone vibrator 20 5.7.5 Unwanted sound radiated by an audiometer 20 5.8 Testing of automatic-recording audiometers 20 5.9 Interface connections 20 6 Test signals . 20 6.1 Speech signals . 20 6.1.1 Speech signal general
15、requirements 20 6.1.2 Free-field equivalent earphone output level . 20 6.1.3 Uncorrected earphone output level 21 6.1.4 Loudspeaker output level . 21 6.1.5 Bone vibrator output level 21 6.1.6 Speech signal frequency response 21 6.1.7 Calibration signal . 21 6.1.8 Live voice microphone frequency resp
16、onse 22 6.1.9 Scale reference and output level 22 6.1.10 Distortion requirements for speech signals 22 6.2 Pure tones 23 6.2.1 Frequency range and hearing level range 23 6.2.2 Frequency accuracy acceptance limits . 24 6.2.3 Total harmonic distortion . 24 6.2.4 Rate of frequency change 25 6.2.5 Frequ
17、ency modulation . 25 6.3 External signal sources . 25 6.3.1 Signals 25 IEC 60645-1:2017 RLV IEC 2017 3 6.3.2 Frequency response 26 6.3.3 Playback device input 26 6.3.4 Signal-to-noise ratio for playback device input . 26 6.3.5 Electrical sensitivity . 26 6.3.6 Reference level for external signal sou
18、rce . 26 6.4 Operator and test subject speech communication . 26 6.4.1 General . 26 6.4.2 Operator to test subject speech communication(talk-forward) 27 6.4.3 Test subject to operator speech communication(talk-back) 27 6.4.4 Operator to test subject speech communication for live voice speech audiome
19、try 27 6.4.5 Test subject to operator speech communication for vocal response speech audiometry 27 6.5 Masking sound 27 6.5.1 General . 27 6.5.2 Narrow-band noise 28 6.5.3 Speech weighted noise 30 6.5.4 Other masking sound . 30 7 Transducers 30 7.1 Types of transducers 30 7.2 Headband . 30 7.3 Louds
20、peaker . 30 8 Signal level control 30 8.1 Marking of pure-tone and speech signal level controls 30 8.2 Signal indicator . 31 8.3 Accuracy of Sound pressure level and vibratory force level acceptance limits . 31 8.4 Hearing Signal level control 32 8.4.1 Manual audiometers 32 8.4.2 Automatic-recording
21、 audiometers 32 8.4.3 Accuracy of Signal level control acceptance limits . 32 8.5 Masking sound level control 33 8.5.1 General . 33 8.5.2 Masking sound level 33 8.5.3 Accuracy of Masking sound level acceptance limits . 33 8.5.4 Masking sound level range 33 8.6 Tone Signal switching . 33 8.6.1 Tone S
22、ignal switch for manual audiometers . 33 8.6.2 On/off ratio for manual audiometers . 34 8.6.3 Rise/fall times for manual audiometers 34 8.6.4 Automatic pulsed presentation . 34 8.6.5 Subjects response system 35 8.6.6 Subjects response time for automated test procedures . 35 9 Reference tone 35 9.1 G
23、eneral . 35 9.2 Frequencies 35 9.3 Reference tone level control . 36 9.3.1 Range 36 9.3.2 Intervals 36 9.3.3 Marking . 36 4 IEC 60645-1:2017 RLV IEC 2017 9.3.4 Accuracy Acceptance limits . 36 9.3.5 Operation 36 10 Calibration . 36 11 Electrical output of test signals 37 12 Audiogram format 37 13 Tes
24、t requirements to demonstrate conformity 38 13.1 General . 38 13.2 Environmental conditions and power supply variation 38 13.3 Electromagnetic compatibility 39 13.4 Unwanted sound . 39 13.4.1 Unwanted sound from an earphone . 39 13.4.2 Unwanted sound from a bone vibrator 40 13.4.3 Unwanted sound rad
25、iated by an audiometer 40 13.5 Total harmonic distortion of test signals 40 13.6 Microphone for live voice speech testing . 41 13.7 Signal accuracy 41 13.7.1 Accuracy of sound pressure level and vibratory force level 41 13.7.2 Accuracy of hearing level control . 41 13.8 Masking sound 41 13.8.1 Narro
26、w-band noise 41 13.8.2 Masking sound level 41 13.9 Headbands . 41 13.9.1 General . 41 13.9.2 Supra-aural and circumaural earphone headband 42 13.9.3 Bone vibrator headband . 42 14 Maximum permitted expanded uncertainty of measurements U max. 42 15 Marking and instruction manual . 43 15.1 Marking . 4
27、3 15.2 Instruction manual 44 Annex A (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement . 46 Bibliography 47 Figure 1 Rise/fall envelope of test tones 35 Figure A.1 Relationship between tolerance interval, cor
28、responding acceptance interval and the maximum permitted uncertainty of measurement . 46 Table 1 Minimum facilities for fixed-frequency audiometers 16 Table 2 Minimum number of frequencies to be provided and the minimum range of values of hearing level for fixed-frequency type and class of audiomete
29、r 23 Table 3 Minimum range of values of hearing level for EHF audiometers . Table 3 Maximum permissible acoustic total harmonic distortion, for supra-aural, circumaural, insert earphones and bone vibrators . 25 Table 4 Narrow-band masking noise: upper and lower cut-off frequencies for a sound pressu
30、re spectrum density level of 3 dB referred referenced to the level at the centre frequency of the band 29 Table 5 Reference Standards for obtaining audiometric zero specifying reference equivalent threshold levels 37 IEC 60645-1:2017 RLV IEC 2017 5 Table 6 Symbols for the graphical presentation of h
31、earing threshold levels 38 Table 7 Values of U maxfor basic measurements . 43 6 IEC 60645-1:2017 RLV IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS AUDIOMETRIC EQUIPMENT Part 1: Equipment for pure-tone and speech audiometry FOREWORD 1) The International Electrotechnical Commis
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41、n or any other IEC Publications. 8) Attention is drawn to the Normative 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 Publicatio
42、n may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. DISCLAIMER This Redline version is not an official IEC Standard and is intended only to provide the user with an indication of what changes have been made to the previous version.
43、Only the current version of the standard is to be considered the official document. This Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. A vertical bar appears in the margin wherever a change has been made. Additions a
44、re in green text, deletions are in strikethrough red text. IEC 60645-1:2017 RLV IEC 2017 7 International Standard IEC 60645-1 has been prepared by IEC technical committee 29: Electroacoustics. This fourth edition cancels and replaces the third edition, published in 2012, and the first edition IEC 60
45、645-2, published in 1993. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: This edition now includes the requirements for both pure-tone (prior edition of IEC 60645-1) and speech audiometers (prior
46、edition of IEC 60645-2) into a single document. The technical requirements in this edition remain similar to the intent of the prior two documents, but now eliminate technical and editorial contradictions caused by two separate standards with different review cycles applying to an audiometer. The te
47、xt of this International Standard is based on the following documents: FDIS Report on voting 29/927/FDIS 29/941/RVD Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in acco
48、rdance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60645 series, published under the general title Electroacoustics Audiometric equipment, can be found on the IEC website. Future standards in this series will carry the new general title as cited above. Titles of existing stan
49、dards in this series will be updated at the time of the next edition. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The “colour inside” logo on the cover page of this publication indicates that it contains colours
