Electroacoustics - Hearing aids - Part 16: Definition and verification of hearing aid features

IEC 60118-16:2022 gives definitions for common hearing aid features such as noise reduction or feedback reduction, etc. Only acoustical inputs are considered. Binaural features are currently not covered in this document. In addition, measurement procedures are described to verify hearing aid features. The objective is not to evaluate the performance of features but to verify their existence and functionality.
Furthermore, definitions and procedures are kept as general as possible so that this document can be applied to various types of hearing aids, for example, air-conduction hearing aids or bone conduction hearing aids. To this end, the general definition for the term "hearing aid" given in IEC 60118-0 is adopted, and this document does not refer to any specific ear simulator or acoustic coupler but uses a general definition of a coupler. However, if a general view is not applicable or leads to unclear or complex wording, the situation for an air-conduction hearing aid only is considered. Nevertheless, an explanation is given on how this document can be applied to hearing aids which do not use air conduction.

Électroacoustique - Appareils de correction auditive - Partie 16: Définition et vérification des caractéristiques des appareils de correction auditive

L'IEC 60118-16:2022 définit les caractéristiques communes des appareils de correction auditive telles que la réduction du bruit ou la réduction des retours, etc. Seules les entrées acoustiques sont prises en considération. Les caractéristiques binaurales ne sont actuellement pas couvertes par le présent document. En outre, des procédures de mesure destinées à vérifier les caractéristiques des appareils de correction auditive sont décrites. L’objectif n’est pas d’évaluer les performances des caractéristiques, mais de vérifier leur existence et leur fonctionnalité.
Par ailleurs, les définitions et les procédures sont maintenues aussi générales que possible de telle sorte que le présent document peut être appliqué à différents types d'appareils de correction auditive, par exemple, appareils de correction auditive à conduction aérienne ou à conduction osseuse. À cette fin, la définition générale du terme "appareil de correction auditive" donnée dans l’IEC 60118-0 est adoptée, et le présent document ne fait référence à aucun simulateur d'oreille ou aucun coupleur acoustique spécifiques, mais utilise une définition générale du terme "coupleur". Toutefois, lorsqu’une vue générale n’est pas applicable ou entraîne une formulation peu claire ou complexe, seule la situation d’un appareil de correction auditive à conduction aérienne est prise en considération. Néanmoins, une explication est donnée sur la manière dont le présent document peut être appliqué à des appareils de correction auditive qui n’utilisent pas la conduction aérienne.

General Information

Status
Published
Publication Date
15-Mar-2022
Technical Committee
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
15-Apr-2022
Completion Date
16-Mar-2022
Ref Project

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IEC 60118-16 ®
Edition 1.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –
Part 16: Definition and verification of hearing aid features

Électroacoustique – Appareils de correction auditive –
Partie 16: Définition et vérification des caractéristiques des appareils de
correction auditive
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IEC 60118-16 ®
Edition 1.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –

Part 16: Definition and verification of hearing aid features

Électroacoustique – Appareils de correction auditive –

Partie 16: Définition et vérification des caractéristiques des appareils de

correction auditive
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-1088-7

– 2 – IEC 60118-16:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Application to non-air-conduction hearing aids . 10
5 Test equipment . 10
5.1 Acoustical requirements . 10
5.2 Examples of test signals for common listening situations . 11
6 Verification of noise reduction. 11
6.1 Noise reduction for speech enhancement . 11
6.2 Gain reduction for noise . 12
7 Strategies of hearing aid programs and their verification. 13
7.1 General . 13
7.2 User-selected hearing aid programs . 13
7.2.1 Description . 13
7.2.2 Verification . 13
7.3 Automatically-selected hearing aid programs depending on listening
situation . 14
7.3.1 Description . 14
7.3.2 Verification by setting a marker . 15
7.3.3 Verification using a linear gain configuration . 15
8 Verification of feedback reduction . 16
8.1 General . 16
8.2 Coupling of the hearing aid . 16
8.3 Measurement procedure . 16
8.4 Post processing . 17
9 Verification of the number of hearing aid channels . 18
9.1 Visualization of the effect of multichannel signal processing . 18
9.2 Evaluation of the number of independent channels . 19
10 Verification of an output limiter . 20
Annex A (informative) Coupling of the hearing aid to the measurement coupler in
order to provoke feedback . 21
A.1 Simplified coupling of air-conduction hearing aids to the 2 cm acoustic
coupler . 21
A.2 Head and torso simulator with vented ear canal extension . 22
Annex B (informative) Particular guidance . 24
B.1 Verification of user selected hearing aid programs . 24
B.2 Automatically-selected hearing aid programs depending on listening
situation . 25
B.2.1 Verification by setting a marker . 25
B.2.2 Verification by using a linear gain configuration . 27
Bibliography . 29

Figure 1 – Visualization of user selected HAPs . 13
Figure 2 – Visualization of automatically-selected HAPs depending on listening
situation . 14

Figure 3 – Example of the plot of the results of the feedback reduction measurement . 18
Figure A.1 – Simplified coupling of air-conduction hearing aids with one microphone to
the 2 cm acoustic coupler to provoke feedback . 21
Figure A.2 – Simplified coupling of air-conduction hearing aids with two microphones to
the 2 cm acoustic coupler to provoke feedback . 22
Figure A.3 – Head and torso simulator for the measurement of air-conduction hearing
aids according to IEC/TS 60318-7 together with an ear simulator according to
IEC 60318-4 and a vented ear canal extension . 22
Figure A.4 – Example for a vented ear canal extension with medium flow (left) and high
flow (right) . 23
Figure B.1 – Visualization of the verification of user-selected hearing aid programs . 24
Figure B.2 – Visualization of the measurement of the reference data for the verification
of automatically-selected hearing aid programs by setting a marker . 25
Figure B.3 – Visualization of the measurement for the verification of
automatically-selected hearing aid programs by setting a marker where a marker is set
to the hearing aid program 1 . 26
Figure B.4 – Visualization of the measurement for the verification of
automatically-selected hearing aid programs by using a linear gain configuration . 28

Table 1 – Examples of test signals for different listening situations . 11
Table 2 – Symbols used for the evaluation and results of the feedback reduction
measurement . 17
Table 3 – Example results of the procedure for the verification of multichannel signal
processing . 19
Table B.1 – Example results for the verification of user selected hearing aid programs . 24
Table B.2 – Example results for the verification of automatically-selected hearing aid
programs by setting a marker . 27
Table B.3 – Example for the evaluation of the results for the verification of
automatically-selected hearing aid programs by setting a marker . 27

– 4 – IEC 60118-16:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS – HEARING AIDS –

Part 16: Definition and verification of hearing aid features

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standard
...

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