IEC 60645-1:2017
(Main)Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone and speech audiometry
Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone and speech audiometry
IEC 60645-1:2017 specifies general requirements for audiometers designed for use in determining hearing threshold levels, relative to standard reference threshold levels established by means of psychoacoustic test methods, and those designed to perform psychoacoustic tests using speech material.
The object of this standard is to ensure:
a) that tests of hearing in the frequency range 125 Hz to 16 kHz on a given human ear, performed with different pure-tone audiometers which comply with this standard, give substantially the same results;
b) that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing;
c) that a means of presenting speech material to a subject in a standardized manner is provided. This will ensure that tests of hearing using a specific speech signal and a specific manner of signal presentation, when performed with different audiometers which comply with this standard, give substantially the same results;
d) that audiometers are classified according to the range of test signals they present, according to the mode of operation or according to their presumed primary application.
This fourth edition cancels and replaces the third edition, published in 2012, and the first edition IEC 60645-2, published in 1993. This edition constitutes a technical revision.
This edition now includes the requirements for both pure-tone (prior edition of IEC 60645-1) and speech audiometers (prior 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.
Electroacoustique - Appareils audiométriques - Partie 1: Appareils pour l'audiométrie tonale et vocale
L'IEC 60645-1:2017 spécifie les exigences générales applicables aux audiomètres destinés à la détermination des seuils d'audition, par rapport aux seuils de référence normalisés établis au moyen de méthodes d'essai psychoacoustiques, ainsi qu'aux audiomètres destinés à la réalisation d'essais psychoacoustiques sur du matériel vocal.
L'objet de la présente norme est de s'assurer:
a) que les essais d'audition effectués sur une oreille humaine donnée dans la plage de fréquences de 125 Hz à 16 kHz avec différents audiomètres tonaux conformes à la présente norme donnent sensiblement les mêmes résultats;
b) que les résultats obtenus constituent une comparaison correcte entre l'audition de l'oreille mesurée et le seuil d'audition de référence;
c) qu'un moyen de présenter un matériel vocal à un sujet de manière normalisée est fourni. Cela permettra de s'assurer que les essais d'audition faisant appel à un signal vocal spécifique et à une manière spécifique de présenter le signal donnent sensiblement les mêmes résultats lorsqu'ils sont pratiqués avec différents audiomètres conformes à la présente norme,
d) que les audiomètres sont classés conformément à la plage de signaux d'essai qu'ils présentent, conformément à leur mode de fonctionnement ou conformément à leur application principale présumée.
Cette quatrième édition annule et remplace la troisième édition parue en 2012 et la première édition de l'IEC 60645-2 parue en 1993. Cette édition constitue une révision technique.
Cette édition inclut désormais les exigences concernant les audiomètres tonaux (édition précédente de l'IEC 60645-1) et vocaux (édition précédente de l'IEC 60645-2) réunies en un seul document. Les exigences techniques contenues dans cette édition demeurent similaires, dans leur esprit, à celles des deux documents précédents, mais les contradictions éditoriales et techniques dues à l'existence de deux normes distinctes ayant des cycles de révision différents ont été supprimées.
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IEC 60645-1 ®
Edition 4.0 2017-03
REDLINE VERSION
INTERNATIONAL
STANDARD
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Electroacoustics – Audiometric equipment –
Part 1: Equipment for pure-tone and speech audiometry
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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IEC 60645-1 ®
Edition 4.0 2017-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electroacoustics – Audiometric equipment –
Part 1: Equipment for pure-tone and speech audiometry
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.140.50 ISBN 978-2-8322-4111-0
– 2 – IEC 60645-1:2017 RLV © IEC 2017
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 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 . 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 transducers . 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 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 response . 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 Frequency modulation . 25
6.3 External signal sources . 25
6.3.1 Signals . 25
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 source . 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
audiometry . 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 Loudspeaker . 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 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 Signal 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 Subject’s response system . 35
8.6.6 Subject’s response time for automated test procedures . 35
9 Reference tone . 35
9.1 General . 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 .
...
IEC 60645-1 ®
Edition 4.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Audiometric equipment –
Part 1: Equipment for pure-tone and speech audiometry
Électroacoustique – Appareils audiométriques –
Partie 1: Appareils pour l’audiométrie tonale et vocale
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
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Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60645-1 ®
Edition 4.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Audiometric equipment –
Part 1: Equipment for pure-tone and speech audiometry
Électroacoustique – Appareils audiométriques –
Partie 1: Appareils pour l’audiométrie tonale et vocale
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-4079-3
– 2 – IEC 60645-1:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Requirements by type and class of audiometer . 13
5 General requirements . 15
5.1 General safety requirements . 15
5.2 Acoustic safety requirements . 15
5.3 Environmental conditions . 15
5.4 Warm-up time . 15
5.5 Power supply variation . 15
5.5.1 Interruption of power supply . 15
5.5.2 Mains operation . 15
5.5.3 Battery operation . 15
5.5.4 Other power supplies . 16
5.6 Electromagnetic compatibility . 16
5.7 Unwanted sound . 16
5.7.1 General . 16
5.7.2 Unwanted sound from and between any combination of transducers . 16
5.7.3 Unwanted sound from an earphone . 16
5.7.4 Unwanted sound from a bone vibrator. 16
5.7.5 Unwanted sound radiated by an audiometer . 17
5.8 Testing of automatic-recording audiometers . 17
5.9 Interface connections . 17
6 Test signals . 17
6.1 Speech signals . 17
6.1.1 Speech signal general requirements . 17
6.1.2 Free-field equivalent earphone output level . 17
6.1.3 Uncorrected earphone output level . 18
6.1.4 Loudspeaker output level . 18
6.1.5 Bone vibrator output level . 18
6.1.6 Speech signal frequency response . 18
6.1.7 Calibration signal . 18
6.1.8 Live voice microphone frequency response . 18
6.1.9 Scale reference and output level . 19
6.1.10 Distortion requirements for speech signals . 19
6.2 Pure tones . 20
6.2.1 Frequency range and hearing level range . 20
6.2.2 Frequency acceptance limits . 21
6.2.3 Total harmonic distortion . 21
6.2.4 Rate of frequency change . 21
6.2.5 Frequency modulation . 21
6.3 External signal sources . 22
6.3.1 Signals . 22
6.3.2 Frequency response . 22
6.3.3 Playback device input . 22
6.3.4 Signal-to-noise ratio for playback device input . 22
6.3.5 Electrical sensitivity . 22
6.3.6 Reference level for external signal source . 23
6.4 Operator and test subject speech communication . 23
6.4.1 General . 23
6.4.2 Operator to test subject speech communication (talk-forward) . 23
6.4.3 Test subject to operator speech communication (talk-back) . 23
6.4.4 Operator to test subject speech communication for live voice speech
audiometry . 23
6.4.5 Test subject to operator speech communication for vocal response
speech audiometry . 24
6.5 Masking sound . 24
6.5.1 General . 24
6.5.2 Narrow-band noise . 24
6.5.3 Speech weighted noise . 26
6.5.4 Other masking sound . 26
7 Transducers . 26
7.1 Types of transducers . 26
7.2 Headband . 26
7.3 Loudspeaker . 26
8 Signal level control . 26
8.1 Marking of pure-tone and speech signal level controls . 26
8.2 Signal indicator .
...
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