Electroacoustics - Hearing aids - Part 0: Measurement of the performance characteristics of hearing aids

IEC 60118-0:2022 gives recommendations for the measurement of the performance characteristics of air conduction hearing aids measured with an acoustic coupler or occluded ear simulator.
This document is applicable to the measurement and evaluation of the electroacoustical characteristics of hearing aids, for example for type testing and manufacturer data sheets.
This document is also applicable for the measurement of the performance characteristics of hearing aids for production, supply and delivery quality-assurance purposes.
The measurement results obtained by the methods specified in this document will express the performance under conditions of the measurement and can deviate substantially from the performance of the hearing aid under actual conditions of use.
This document primarily uses an acoustic coupler according to IEC 60318-5 which is only intended for loading a hearing aid with specified acoustic impedance and is not intended to reproduce the sound pressure in a person's ear. For measurements reflecting the output level in the normal human ear the occluded ear simulator according to IEC 60318-4 can be used. For extended high-frequency measurements and for deep insert hearing aids, the acoustic coupler according to IEC 60318-8 can be used.
This document also covers measurement of hearing aids with non-acoustic inputs, such as wireless, inductive or electrical input.
This document does not cover the measurement of hearing aids for simulated in situ working conditions, for which IEC 60118-8 can be applied.
This document does not cover the measurement of hearing aids under typical user settings and using a speech-like signal, for which IEC 60118-15 can be applied.
IEC 60118-0:2022 merges and updates the methods previously described in IEC 60118-0:2015 and IEC 60118-7:2005. It cancels and replaces the third edition of IEC 60118-0 published in 2015. This edition constitutes a technical revision.
Measurements for quality control as described in IEC 60118-7:2005 can be found in Clause 10 of this document.
This edition includes the following significant technical changes with respect to previous editions:
a) the default use of an acoustic coupler according to IEC 60318-5,
b) addition of the optional use of an occluded ear simulator according to IEC 60318-4,
c) addition of the optional use of an acoustic coupler according to IEC 60318-8 (new standard based on IEC TS 62886) when information about the response above 8 kHz is needed, or the optional use of the acoustic coupler according to IEC 60318-8 for deep insert hearing aids,
d) the addition of measurements of the performance of hearing aids for production, supply and delivery quality assurance purposes,
e) corrected and updated measurement configuration and methods, adding the use of a sequential measurement as preferred configuration,
f) updated and expanded measurement procedures for the non-acoustic inputs of the hearing aid.

Électroacoustique - Appareils de correction auditive - Partie 0: Mesure des caractéristiques fonctionnelles des appareils de correction auditive

L'IEC 60118-0:2022 donne des recommandations pour la mesure des caractéristiques fonctionnelles des appareils de correction auditive à conduction aérienne avec un coupleur acoustique ou un simulateur d'oreille occluse.
Le présent document s'applique à la mesure et à l'évaluation des caractéristiques électroacoustiques des appareils de correction auditive, par exemple pour les essais de type et les fiches techniques des fabricants.
Le présent document s'applique également pour la mesure des caractéristiques fonctionnelles des appareils de correction auditive aux fins d'assurance de la qualité de la production, de l'approvisionnement et de la livraison.
Les résultats de mesure obtenus par les méthodes spécifiées dans le présent document expriment le fonctionnement dans les conditions de mesure et peuvent s'écarter sensiblement du fonctionnement de l'appareil de correction auditive en conditions réelles d'utilisation.
Le présent document utilise principalement un coupleur acoustique selon l'IEC 60318-5, qui est seulement destiné au chargement d'un appareil de correction auditive avec une impédance acoustique spécifiée et qui n'a pas pour objet de reproduire la pression acoustique à l'intérieur de l'oreille humaine. Pour des mesures qui reflètent le niveau de sortie dans l'oreille humaine normale, le simulateur d'oreille occluse selon l'IEC 60318-4 peut être utilisé. Pour des mesures à hautes fréquences étendues et pour des appareils de correction auditive à insertion profonde, le coupleur acoustique selon l'IEC 60318-8 peut être utilisé.
Le présent document couvre également la mesure des appareils de correction auditive avec des entrées non acoustiques, telles que des entrées sans fil, inductives ou électriques.
Le présent document ne couvre pas la mesure des appareils de correction auditive dans des conditions simulées de fonctionnement in situ, pour laquelle l'IEC 60118-8 peut être utilisée.
Le présent document ne couvre pas la mesure des appareils de correction auditive sous des réglages utilisateurs types et à l'aide d'un signal de type parole, pour laquelle l'IEC 60118‑15 peut être utilisée.
L'IEC 60118-0:2022 fusionne et met à jour les méthodes décrites précédemment dans l'IEC 60118-0:2015 et l'IEC 60118-7:2005. Elle annule et remplace la troisième édition de l'IEC 60118-0 parue en 2015. Cette édition constitue une révision technique.
Les mesures de contrôle de la qualité décrites dans l'IEC 60118-7:2005 peuvent être consultées à l'Article 10 du présent document.
Cette édition inclut les modifications techniques majeures suivantes par rapport aux éditions précédentes:
a) utilisation par défaut d'un coupleur acoustique selon l'IEC 60318-5;
b) ajout de l'utilisation facultative d'un simulateur d'oreille occluse selon l'IEC 60318-4;
c) ajout de l'utilisation facultative d'un coupleur acoustique selon l'IEC 60318-8 (nouvelle norme fondée sur l'IEC TS 62886), lorsque des informations concernant la réponse au dessus de 8 kHz sont nécessaires, ou l'utilisation facultative d'un coupleur acoustique selon l'IEC 60318-8 pour les appareils de correction auditive à insertion profonde;
d) ajout de mesures des performances des appareils de correction auditive aux fins d'assurance de la qualité de la production, de l'approvisionnement et de la livraison;
e) correction et mise à jour de la configuration et des méthodes de mesure, avec ajout de l'utilisation d'une mesure séquentielle comme configuration privilégiée;
f) mise à jour et élargissement des procédures de mesure pour les entrées non acoustiques des appareils de correction auditive.

General Information

Status
Published
Publication Date
29-Aug-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
30-Aug-2022
Ref Project

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IEC 60118-0
Edition 4.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Hearing aids –
Part 0: Measurement of the performance characteristics of hearing aids
Électroacoustique – Appareils de correction auditive –
Partie 0: Mesure des caractéristiques fonctionnelles des appareils de correction
auditive
IEC 60118-0:2022-08(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60118-0
Edition 4.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electroacoustics – Hearing aids –
Part 0: Measurement of the performance characteristics of hearing aids
Électroacoustique – Appareils de correction auditive –
Partie 0: Mesure des caractéristiques fonctionnelles des appareils de correction
auditive
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-5591-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60118-0:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

4 General conditions......................................................................................................... 15

4.1 Acoustic measurement method ............................................................................. 15

4.2 Acoustic couplers and occluded ear simulator ....................................................... 15

4.3 Input signals and frequency range ........................................................................ 17

4.4 Reporting of data .................................................................................................. 17

5 Test equipment .............................................................................................................. 17

5.1 General ................................................................................................................. 17

5.2 Test enclosure ...................................................................................................... 18

5.2.1 General ......................................................................................................... 18

5.2.2 Type 1 "anechoic-chamber" ........................................................................... 18

5.2.3 Type 2 "test-box" ........................................................................................... 19

5.3 Measurement configuration ................................................................................... 19

5.3.1 General ......................................................................................................... 19

5.3.2 Measurement configuration for non-directional hearing aids .......................... 19

5.3.3 Measurement configuration for directional hearing aids ................................. 22

5.4 Sequential measurement method .......................................................................... 23

5.5 Other measurement methods ................................................................................ 24

5.6 Acoustic response measurement........................................................................... 24

5.7 Sound source system ............................................................................................ 24

5.8 Measurement system for the sound pressure level and distortion produced

by a hearing aid .................................................................................................... 25

5.9 Electrical input ...................................................................................................... 26

5.10 Direct-current measurement system ...................................................................... 26

5.11 Magnetic field source for SPLIV measurements .................................................... 26

5.12 Magnetic field source for hearing aids having induction pick-up coil for use

with a telephone.................................................................................................... 27

6 Normal operating conditions for a hearing aid ................................................................ 27

6.1 General ................................................................................................................. 27

6.2 Battery or supply voltage ...................................................................................... 28

6.3 Settings of controls ............................................................................................... 28

6.3.1 General ......................................................................................................... 28

6.3.2 Full-on setting (FOS) ..................................................................................... 28

6.3.3 Reference test setting (RTS) ......................................................................... 28

6.4 Ambient conditions................................................................................................ 29

6.5 Acoustical connection to the hearing aid ............................................................... 29

6.6 Accessories .......................................................................................................... 29

7 Basic acoustic hearing aid measurements ..................................................................... 29

7.1 General ................................................................................................................. 29

7.2 Frequency response curves .................................................................................. 29

7.3 OSPL90 frequency response curve ....................................................................... 30

7.4 Full-on gain frequency response curve .................................................................. 30

7.5 Basic frequency response curve ........................................................................... 31

7.5.1 Test procedure .............................................................................................. 31

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IEC 60118-0:2022 © IEC 2022 – 3 –

7.5.2 Frequency range of amplification ................................................................... 31

7.5.3 Reference test gain (RTG) ............................................................................. 32

7.6 Total harmonic distortion ....................................................................................... 32

8 Special hearing aid measurements ................................................................................ 33

8.1 General ................................................................................................................. 33

8.2 Difference frequency distortion ............................................................................. 33

8.2.1 Difference frequency distortion products ........................................................ 33

8.2.2 Total difference frequency distortion .............................................................. 35

8.3 Equivalent input noise (EIN) .................................................................................. 36

8.4 Equivalent input noise in one-third-octave bands (EIN-one-third-octave) ............... 37

8.5 Measurements of AGC hearing aids ...................................................................... 39

8.5.1 General ......................................................................................................... 39

8.5.2 Steady-state input-output characteristics ....................................................... 39

8.5.3 AGC characteristics (attack and release time) ............................................... 40

8.6 Effects of tone control and gain control ................................................................. 40

8.6.1 Basic frequency response: effect of tone control ............................................ 40

8.6.2 Frequency response: effect of gain control position ....................................... 40

8.6.3 Characteristics of the gain control .................................................................. 41

8.7 Battery related measurements .............................................................................. 41

8.7.1 General ......................................................................................................... 41

8.7.2 Battery current measurement ......................................................................... 41

8.7.3 Effects of variation of battery or supply voltage and internal resistance ......... 41

9 Special measurements for hearing aids having non-acoustical inputs ............................ 42

9.1 General ................................................................................................................. 42

9.2 Equivalence of output levels for a non-acoustical input ......................................... 43

9.3 Measurement setup for "Wireless" input (WL) ....................................................... 43

9.3.1 General ......................................................................................................... 43

9.3.2 Measurement setup ....................................................................................... 43

9.3.3 Wireless basic frequency response SPLWL ................................................... 44

9.3.4 HFA-SPLWL .................................................................................................. 44

9.3.5 Frequency response with full-on setting ......................................................... 44

9.3.6 Equivalent wireless input sensitivity level (EWLS) .......................................... 44

9.4 Hearing aids with electrical input ........................................................................... 45

9.4.1 General ......................................................................................................... 45

9.4.2 Basic frequency response (SPLEI) ................................................................. 45

9.4.3 HFA-SPLEI .................................................................................................... 45

9.4.4 Frequency response with full-on setting ......................................................... 45

9.4.5 Equivalent electrical input sensitivity level (EEIS) .......................................... 45

9.4.6 Connector system for electrical input ............................................................. 45

9.5 Hearing aids having induction pick-up coil in a vertical magnetic field ................... 46

9.5.1 General ......................................................................................................... 46

9.5.2 Basic frequency response in a vertical magnetic field (SPLIV) ....................... 46

9.5.3 Frequency response with full-on setting (full-on SPLIV) ................................. 46

9.5.4 Effect of gain control position on frequency response .................................... 46

9.5.5 Harmonic distortion ........................................................................................ 47

9.5.6 HFA-SPLIV .................................................................................................... 47

9.5.7 Equivalent test loop sensitivity level (ETLS) ................................................... 47

9.5.8 Full-on HFA-SPLIV ........................................................................................ 47

9.6 Hearing aids having induction pick-up coil for use with a telephone ...................... 48

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– 4 – IEC 60118-0:2022 © IEC 2022

9.6.1 SPLITS response curve ................................................................................. 48

9.6.2 HFA-SPLITS .................................................................................................. 48

9.6.3 Relative simulated equivalent telephone sensitivity level (RSETS) ................. 49

10 Measurement of performance characteristics for production, supply and delivery

quality assurance purposes ........................................................................................... 49

10.1 General ................................................................................................................. 49

10.2 Nominal characteristics ......................................................................................... 49

10.3 Reference test gain ............................................................................................... 50

10.4 OSPL90 ................................................................................................................ 50

10.5 Full-on gain ........................................................................................................... 50

10.6 Frequency response curve .................................................................................... 50

10.7 Bandwidth frequencies f and f ........................................................................... 51

1 2

10.8 Battery or supply voltage ...................................................................................... 52

10.9 Battery current ...................................................................................................... 52

10.10 Total harmonic distortion ....................................................................................... 52

10.11 Equivalent input noise level .................................................................................. 52

10.12 Full-on HFA-SPLIV ............................................................................................... 53

10.13 Equivalent test loop sensitivity level (ETLS) .......................................................... 53

10.14 Relative simulated equivalent telephone sensitivity level (RSETS) ........................ 53

10.15 HFA-SPLITS ......................................................................................................... 53

10.16 Equivalent electrical input sensitivity level (EEIS) ................................................. 53

10.17 Steady-state input-output AGC characteristics ...................................................... 54

10.18 Nominal attack time and release time .................................................................... 54

11 Maximum permitted expanded uncertainty of measurements ......................................... 54

Annex A (normative) Simultaneous measurement method .................................................... 57

A.1 General ................................................................................................................. 57

A.2 Measurement method ........................................................................................... 57

A.3 Comparison of the simultaneous method ............................................................... 57

Annex B (normative) Substitution measurement method ...................................................... 58

B.1 General ................................................................................................................. 58

B.2 Measurement method ........................................................................................... 58

B.3 Comparison of the substitution method ................................................................. 59

Annex C (normative) Effect of MLE on non-acoustic input hearing aids ................................ 60

C.1 Acoustic and non-acoustic input equivalence ........................................................ 60

C.2 In situ equivalence measurement in the case of a known MLE .............................. 61

C.3 HFA equivalence of output levels for non-acoustical inputs ................................... 62

C.3.1 General ......................................................................................................... 62

C.3.2 In situ output level equivalency of wireless input sensitivity level

(EWLS) .......................................................................................................... 63

C.3.3 In situ output level equivalency of electrical input sensitivity level (EEIS) ....... 63

C.3.4 In situ output level equivalency of test loop sensitivity level (ETLS) ............... 63

C.3.5 In situ output level equivalency of telephone sensitivity level (RSETS) .......... 64

Annex D (informative) Examples of uncertainty calculation .................................................. 65

D.1 General ................................................................................................................. 65

D.2 Uncertainty calculations ........................................................................................ 65

D.3 Sound source system for test-box ......................................................................... 65

D.4 Sound source system for anechoic-chamber ......................................................... 66

D.5 Hearing aid measurement ..................................................................................... 67

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IEC 60118-0:2022 © IEC 2022 – 5 –
3 3

Annex E (informative) Comparison of 2 cm coupler and 0,4 cm coupler ........................... 68

E.1 General ................................................................................................................. 68

E.2 Influence of sound source impedance ................................................................... 68

3 3
E.3 Comparison of frequency responses of the 0,4 cm , the 2 cm coupler and

the occluded ear simulator .................................................................................... 70

Bibliography .......................................................................................................................... 72

Figure 1 – Example of test arrangement for behind the ear hearing aid ................................. 21

Figure 2 – Example of test arrangement for in the ear hearing aid ........................................ 22

Figure 3 – Example of test arrangement for directional hearing aid ....................................... 23

Figure 4 – Telephone magnetic field simulator (TMFS) ......................................................... 27

Figure 5 – Example of OSPL90 curve and basic frequency response curve........................... 30

Figure 6 – Example of determination of frequency range from basic frequency

response curve ..................................................................................................................... 32

Figure 7 – Example of fundamental and difference frequency distortion products .................. 35

Figure 8 – Example of total difference frequency distortion ................................................... 36

Figure 9 – Example of hearing aid acoustic gain ................................................................... 38

Figure 10 – Example of hearing aid output noise and test equipment noise ........................... 38

Figure 11 – Example of hearing aid equivalent input noise and ambient noise ...................... 39

Figure 12 – Example of a steady-state input-output characteristic ......................................... 40

Figure 13 – Measurement setup for wireless input ................................................................ 44

Figure 14 – Example of hearing aids on TMFS for SPLITS test ............................................. 48

Figure 15 – Example of tolerance limits and determination of frequency range from

basic frequency response curve ............................................................................................ 51

Figure 16 – Manufacturer acceptance interval (a) and purchaser acceptance interval

(b) with tolerance and maximum permitted uncertainty U ................................................ 56

max

Figure B.1 – Example of test arrangement for the substitution method .................................. 59

Figure C.1 – Acoustic a) and non-acoustic b) transmission paths .......................................... 61

Figure C.2 – Example of SPLIV equivalence for ITC ............................................................. 62

Figure E.1 – Deviation from the normalized coupler volume ratio as function of the

effective source volume V ................................................................................................... 69

Figure E.2 – Magnitude frequency responses of acoustic impedance of the 2 cm , the

0,4 cm coupler and various hearing aid types ..................................................................... 70

3 3
Figure E.3 – Comparative measurement of the 0,4 cm coupler, the 2 cm coupler and

the occluded ear simulator frequency responses ................................................................... 71

Table 1 – Overview on the use of acoustic couplers and occluded ear simulator ................... 17

Table 2 – Resistors and open circuit voltages for zinc-air battery simulators ......................... 28

Table 3 – Distortion test frequencies and input sound pressure levels ................................... 33

Table 4 – OSPL90: Acceptable deviation from the nominal values: ....................................... 50

Table 5 – Full-on gain: Acceptable deviation from the nominal value ..................................... 50

Table 6 – Tolerances and acceptance intervals of the frequency response ........................... 51

Table 7 – Battery current: Acceptable deviation from the nominal value ................................ 52

Table 8 – Total harmonic distortion: Acceptable deviation from the nominal value ................. 52

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– 6 – IEC 60118-0:2022 © IEC 2022

Table 9 – Equivalent input noise level: Acceptable deviation from the nominal value ............ 52

Table 10 – Full-on HFA-SPLIV: Acceptable deviation from the nominal value........................ 53

Table 11 – ETLS: Acceptable deviation from the nominal value ............................................ 53

Table 12 – RSETS: Acceptable deviation from the nominal value .......................................... 53

Table 13 – HFA-SPLITS: Acceptable deviation from the nominal value ................................ 53

Table 14 – EEIS: Acceptable deviation from the nominal value ............................................. 54

Table 15 – Acceptable deviation from the nominal values at input levels of 50 dB and

90 dB .................................................................................................................................... 54

Table 16 – Values of U for measurements ...................................................................... 55

max

Table C.1 – HFA-MLE for various styles of hearing aids........................................................ 63

Table D.1 – Uncertainty sound source system for test-box .................................................... 66

Table D.2 – Uncertainty sound source system for anechoic-chamber .................................... 66

Table D.3 – Uncertainty hearing aid measurement ................................................................ 67

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IEC 60118-0:2022 © IEC 2022 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
HEARING AIDS –
Part 0: Measurement of the performance characteristics of hearing aids
FOREWORD

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