IEC 60118-9:2019

Electroacoustics - Hearing aids - Part 9: Methods of measurement of the performance characteristics of bone conduction hearing aids

IEC 60118-9:2019 specifies methods for the measurement of bone conduction hearing aid characteristics.
The methods described will produce a suitable basis for the exchange of information or for direct comparison of the electroacoustical characteristics of bone conduction hearing aids. These methods are chosen to be practical and reproducible and are based on selected fixed parameters.
The results obtained by the methods specified in this document express the performance under the conditions of measurement; however, the performance of the hearing aid under practical conditions of use will depend upon a number of factors (e.g. effective load impedance, environmental conditions, acoustical environment, etc.).
This document defines methods of measurement of characteristics of bone conduction hearing aids both for
• transcutaneously coupled devices measured on a mechanical coupler, meeting the requirements of IEC 60318-6, and
• bone coupled/bone anchored devices measured on a skull simulator.
IEC 60118-9:2019 cancels and replaces the first edition published in 1985. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) includes bone coupled devices measured on a skull simulator;
b) measurement frequency range increased to 8 000 Hz for bone coupled devices.

Electroacoustique - Appareils de correction auditive - Partie 9: Méthodes de mesure des caractéristiques fonctionnelles des appareils de correction auditive à conduction osseuse

L'IEC 60118-9:2019 spécifie les méthodes permettant de mesurer les caractéristiques des appareils de correction auditive à conduction osseuse.
Les résultats des méthodes décrites constitueront une base adaptée pour échanger des informations ou pour comparer directement les caractéristiques électroacoustiques des appareils de correction auditive à conduction osseuse. Ces méthodes sont choisies pour leur praticabilité et leur reproductibilité, et sont fondées sur des paramètres fixes sélectionnés.
Les résultats obtenus par les méthodes spécifiées dans le présent document expriment le fonctionnement de l'appareil de correction auditive dans les conditions de mesure, mais le fonctionnement en conditions réelles d'utilisation dépend d'un ensemble de facteurs (impédance de charge effective, conditions d'environnement, environnement acoustique, etc.).
Le présent document définit les méthodes permettant de mesurer les caractéristiques des appareils de correction auditive à conduction osseuse qui sont:
• des appareils à couplage transcutané mesurés sur un coupleur mécanique satisfaisant aux exigences de l'IEC 60318-6;
• des appareils à couplage/ancrage osseux mesurés sur un simulateur crânien.
L'IEC 60118-9:2019annule et remplace la première édition parue en 1985. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout des appareils à couplage osseux mesurés sur un simulateur crânien;
b) augmentation de la plage de fréquences de mesure à 8 000 Hz pour les appareils à couplage osseux.

General Information

• Status: Published
• Publication Date: 15-Sep-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: TC 29 - Electroacoustics
• Drafting Committee: WG 13 - TC 29/WG 13
• Current Stage: PPUB - Publication issued
• Start Date: 27-Sep-2019
• Completion Date: 16-Sep-2019

Standards Content (Sample)

IEC 60118-9 ®
Edition 2.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –
Part 9: Methods of measurement of the performance characteristics of bone
conduction hearing aids
Électroacoustique – Appareils de correction auditive –
Partie 9: Méthodes de mesure des caractéristiques fonctionnelles des appareils
de correction auditive à conduction osseuse

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IEC 60118-9 ®
Edition 2.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –

Part 9: Methods of measurement of the performance characteristics of bone

conduction hearing aids
Électroacoustique – Appareils de correction auditive –

Partie 9: Méthodes de mesure des caractéristiques fonctionnelles des appareils

de correction auditive à conduction osseuse

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-7332-6

– 2 – IEC 60118-9:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Measurement method . 11
4.1 General . 11
4.2 Mechanical coupler . 11
4.3 Skull simulator . 11
4.4 Measurement frequency range . 11
4.5 Reporting of data . 12
5 Measurement enclosure and measurement equipment. 12
5.1 General . 12
5.2 Unwanted stimuli in the test enclosure . 12
5.3 Sound source . 12
5.4 Measurement system for the measurement of the vibratory force level
produced by a bone conduction hearing aid . 12
5.5 Direct-current measuring system . 13
5.6 Magnetic field source for ETLS and MMSL measurements . 13
6 Measurement conditions . 14
6.1 General . 14
6.2 Applying the bone vibrator to the mechanical coupler or skull simulator . 14
6.2.1 Transcutaneously coupled devices . 14
6.2.2 Bone coupled devices . 14
6.3 Control of the sound field . 15
6.3.6 Battery or supply voltage . 17
6.3.7 Settings of controls . 18
6.4 Ambient conditions. 18
6.4.1 Measurement space . 18
6.4.2 Bone vibrator, mechanical coupler and skull simulator . 18
7 Measurement procedures . 19
7.1 Frequency response curves . 19
7.2 OVFL90 frequency response curve . 19
7.3 Full-on acousto-mechanical sensitivity level frequency response . 20
7.4 Basic vibratory force level frequency response . 21
7.4.1 Measurement procedure . 21
7.4.2 Frequency range . 21
7.5 Total harmonic distortion . 21
7.6 Equivalent input noise . 22
7.7 Battery current . 22
7.8 Measurements for hearing aids having an induction pick-up coil . 22
7.8.1 General . 22
7.8.2 Equivalent test loop sensitivity (ETLS) . 23
7.8.3 Maximum HFA magneto-mechanical sensitivity level (HFA- MMSL) of
induction pick-up coil . 23
8 Maximum permitted expanded uncertainty of measurements . 23

Bibliography . 26

Figure 1 – Example of a bone coupled device (hearing aid with integral bone vibrator)
mounted on a skull simulator . 15
Figure 2 – Example of a transcutaneously coupled device (spectacle hearing aid with

an integral bone vibrator mounted in the spectacle arm) under measurement . 16
Figure 3 – Example of a transcutaneously coupled device (hearing aid with external
bone vibrator) mounted on the mechanical coupler . 17
Figure 4 – Example of OVFL90 curve and basic force level frequency response curve . 20
Figure 5 – Relationship between tolerance limits, corresponding acceptance intervals
and the maximum permitted uncertainty of measurement, U . 24
MAX
Table 1 – Resistors and open circuit voltages for zinc-air battery simulators . 18
Table 2 – Distortion test frequencies and input sound pressure levels . 22
Table 3 – Example uncertainty budget . 25

– 4 – IEC 60118-9:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
HEARING AIDS –
Part 9: Methods of measurement of the performance
characteristics of bone conduction hearing aids

FOREWORD
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