Electroacoustics - Hearing aids - Measurement of the performance characteristics of hearing aids

This part of IEC 60118 gives recommendations for the measurement of the performance
characteristics of air conduction hearing aids based on a free field technique and measured
with an acoustic coupler.
This part of IEC 60118 is applicable to the measurement and evaluation of the
electroacoustical characteristics of hearing aids, for example for type testing and
manufacturer data sheets.
The test results obtained by the methods specified in this part of IEC 60118 will express the
performance under conditions of the test and may deviate substantially from the performance
of the hearing aid under actual conditions of use.
This part of IEC 60118 uses an acoustic coupler according to IEC 60318-5 which is only
intended for loading a hearing aid with a specified acoustic impedance and is not intended to
model the sound pressure in a person’s ear. The use of this acoustic coupler will yield
different results from those obtained using the occluded ear simulator of IEC 60318-4 as used
in former editions of IEC 60118-0.
For the measurement of the performance characteristics of hearing aids for simulated in situ
working conditions, IEC 60118-8 can be used. For measurement of hearing aids under typical
user settings and using a speech-like signal, IEC 60118-15 can be used.
For the measurement of the performance characteristics of hearing aids for production, supply
and delivery quality-assurance purposes, IEC 60118-7 can be used. The frequency range has
been extended to 8 kHz in this part of IEC 60118 as opposed to 5 kHz in IEC 60118-7.
Though the number of measurements covered by this part of IEC 60118 is limited, it is not
intended that all measurements described herein are mandatory.
In cases of custom-made in-the-ear instruments, the data supplied by the manufacturer
applies only to the particular hearing aid being tested.

/

Electroacoustique Appareils de correction auditive Mesure des caractéristiques de performance des corrections auditives

L'IEC 60118-0:2015 donne des recommandations pour la mesure des caractéristiques fonctionnelles des appareils de correction auditive à conduction aérienne, fondée sur une technique en champ acoustique libre utilisant un coupleur acoustique. Cette troisième édition annule et remplace la deuxième édition parue en 1983 et son Amendement 1:1994, l'IEC 60118-1:1995, l'Amendement 1:1998, l'IEC 60118-2:1983, l'Amendement 1:1993, l'Amendement 2:1997 et l'IEC 60118-6:1999. Cette édition constitue une révision technique.

Elektroakustika - Slušni aparati - Meritve tehničnih karakteristik slušnih aparatov

Ta del standarda IEC 60118 podaja priporočila za meritve tehničnih karakteristik slušnih aparatov, ki delujejo na podlagi prevajanja zvoka po zraku in ki temeljijo na tehniki prostega polja (free field technique) ter so izmerjene s pomočjo akustičnega spojnika.
Ta del standarda IEC 60118 velja za meritve in ocenjevanje elektroakustičnih karakteristik slušnih aparatov za potrebe, na primer, tipskega preskušanja in tehničnih listov proizvajalca.
Rezultati preskusov, pridobljeni z metodami, ki so navedene v tem delu standarda IEC 60118, prikazujejo delovanje v preskusnih pogojih in lahko znatno odstopajo od delovanja slušnega aparata v dejanskih pogojih uporabe.
Ta del standarda IEC 60118 uporablja akustični spojnik skladno s standardom IEC 60318-5, ki obremeni slušni aparat z določeno akustično impedanco in ne spreminja zvočnega tlaka v ušesu. Rezultati, pridobljeni z uporabo tega akustičnega spojnika, se bodo razlikovali od tistih, ki so pridobljeni z uporabo simulatorja zamašenega ušesa, zajetega v standardu IEC 60318-4, kot jo določajo starejše različice standarda IEC 60118-0.
Za meritev tehničnih karakteristik slušnih aparatov v simuliranih pogojih na kraju uporabe lahko uporabite standard IEC 60118-8. Za meritev karakteristik slušnih aparatov z običajnimi uporabniškimi nastavitvami in z uporabo govoru podobnega signala lahko uporabite standard IEC 60118-15.
Za meritev tehničnih karakteristik slušnih aparatov za namene zagotavljanja kakovosti pri izdelavi, dobavi in dostavi lahko uporabite standard IEC 60118-7. Frekvenčni razpon je v tem delu standarda IEC 60118 razširjen na 8 kHz v primerjavi s standardom IEC 60118-7, kjer je bil omejen na 5 kHz.
Čeprav je število meritev, ki jih zajema ta del standarda IEC 60118, omejeno, vse tu opisane meritve niso obvezne.
V primeru instrumentov za vstavitev v uho, ki so narejeni po meri, podatki, ki jih zagotovi proizvajalec, veljajo samo za določen slušni aparat, ki se ga preskuša.

General Information

Status
Published
Publication Date
09-Nov-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Sep-2015
Due Date
06-Nov-2015
Completion Date
10-Nov-2015

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SLOVENSKI STANDARD
SIST EN 60118-0:2015
01-december-2015
1DGRPHãþD
SIST EN 60118-0:2002
SIST EN 60118-0:2002/A1:2002
SIST EN 60118-1:2002 + A1:2002
SIST EN 60118-2:2004
SIST EN 60118-2:2004/A2:2006
SIST EN 60118-6:2002

(OHNWURDNXVWLND6OXãQLDSDUDWL0HULWYHWHKQLþQLKNDUDNWHULVWLNVOXãQLKDSDUDWRY

Electroacoustics - Hearing aids - Measurement of the performance characteristics of

hearing aids

Electroacoustique Appareils de correction auditive Mesure des caractéristiques de

performance des corrections auditives
Ta slovenski standard je istoveten z: EN 60118-0:2015
ICS:
11.180.15 3ULSRPRþNL]DJOXKHRVHEHLQ Aids for deaf and hearing
RVHEH]RNYDURVOXKD impaired people
17.140.50 Elektroakustika Electroacoustics
SIST EN 60118-0:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60118-0:2015
---------------------- Page: 2 ----------------------
SIST EN 60118-0:2015
EUROPEAN STANDARD EN 60118-0
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2015
ICS 17.140.50 Supersedes EN 60118-0:1993, EN 60118-1:1995, EN
60118-2:1995, EN 60118-6:1999
English Version
Electroacoustics - Hearing aids - Part 0: Measurement of the
performance characteristics of hearing aids
(IEC 60118-0:2015)

Electroacoustique - Appareils de correction auditive - Partie Akustik - Hörgeräte - Teil 0: Messung der

0: Mesure des caractéristiques fonctionnelles des appareils Leistungsmerkmale von Hörgeräten

de correction auditive (IEC 60118-0:2015)
(IEC 60118-0:2015)

This European Standard was approved by CENELEC on 2015-07-14. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60118-0:2015 E
---------------------- Page: 3 ----------------------
SIST EN 60118-0:2015
EN 60118-0:2015
European foreword

The text of document 29/867A/FDIS, future edition 3 of IEC 60118-0, prepared by IEC TC 29,

Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as

EN 60118-0:2015.
The following dates are fixed:
(dop) 2016-04-14
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-07-14
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60118-0:1993, EN 60118-1:1995, EN 60118-2:1995, EN 60118-6:1999.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent

rights.
Endorsement notice

The text of the International Standard IEC 60118-0:2015 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated :

IEC 60068 (series) NOTE Harmonized as EN 60068 (series).
IEC 60118-7:2005 NOTE Harmonized as EN 60118-7:2005.
IEC 60118-8:2005 NOTE Harmonized as EN 60118-8:2005.
IEC 60118-12 NOTE Harmonized as EN 60118-12.
IEC 60118-15 NOTE Harmonized as EN 60118-15.
IEC 60318-1 NOTE Harmonized as EN 60318-1.
IEC 60118-15 NOTE Harmonized as EN 60118-15.
IEC 60318-4:2010 NOTE Harmonized as EN 60318-4:2010.
---------------------- Page: 4 ----------------------
SIST EN 60118-0:2015
EN 60118-0:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60318-5 - Electroacoustics - Simulators of human EN 60318-5 -
head and ear -- Part 5: 2 cm³ coupler for the
measurement of hearing aids and
earphones coupled to the ear by means of
ear inserts
ISO 3 - Preferred numbers; Series of preferred - -
numbers
---------------------- Page: 5 ----------------------
SIST EN 60118-0:2015
---------------------- Page: 6 ----------------------
SIST EN 60118-0:2015
IEC 60118-0
Edition 3.0 2015-06
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 978-2-8322-2692-6

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: 7 ----------------------
SIST EN 60118-0:2015
– 2 – IEC 60118-0:2015 © IEC 2015
CONTENTS

FOREWORD ......................................................................................................................... 5

1 Scope ............................................................................................................................ 7

2 Normative references..................................................................................................... 7

3 Terms and definitions .................................................................................................... 8

4 General conditions ....................................................................................................... 12

4.1 Acoustic test method ........................................................................................... 12

4.2 Acoustic coupler .................................................................................................. 13

4.3 Measurement frequency range ............................................................................ 13

4.4 Reporting of data ................................................................................................ 13

5 Test enclosure and test equipment ............................................................................... 13

5.1 General ............................................................................................................... 13

5.2 Unwanted stimuli in the test enclosure ................................................................. 13

5.3 Sound source ...................................................................................................... 13

5.4 Measurement system for the measurement of the sound pressure level and

harmonic distortion produced by a hearing aid ..................................................... 14

5.5 Direct-current measuring system ......................................................................... 14

5.6 Magnetic field source for ETLS and MASL measurements .................................... 15

6 Test conditions ............................................................................................................ 15

6.1 General ............................................................................................................... 15

6.2 Control of the sound field .................................................................................... 16

6.3 Measurement configuration for directional hearing aids ........................................ 17

6.4 Normal operating conditions for a hearing aid ...................................................... 18

6.4.1 General ....................................................................................................... 18

6.4.2 Battery or supply voltage .............................................................................. 18

6.4.3 Settings of controls ...................................................................................... 19

6.4.4 Ambient conditions ....................................................................................... 19

6.4.5 Sound outlet system ..................................................................................... 19

6.4.6 Accessories ................................................................................................. 20

7 Test procedures .......................................................................................................... 20

7.1 Frequency response curves ................................................................................. 20

7.2 OSPL90 frequency response curve ...................................................................... 20

7.3 Full-on gain response curve ................................................................................ 21

7.4 Basic frequency response curve .......................................................................... 21

7.4.1 Test procedure ............................................................................................. 21

7.4.2 Frequency range .......................................................................................... 22

7.4.3 Reference test gain (RTG) ........................................................................... 23

7.5 Total harmonic distortion ..................................................................................... 23

7.6 Equivalent input noise ......................................................................................... 23

7.7 Battery current .................................................................................................... 23

7.8 Measurements for hearing aids having induction pick-up coil ................................ 24

7.8.1 General ....................................................................................................... 24

7.8.2 Equivalent test loop sensitivity (ETLS) .......................................................... 24

7.8.3 Maximum HFA magneto-acoustical sensitivity level (HFA MASL) of

induction pick-up coil .................................................................................... 24

8 Characteristics of electrical input circuits for hearing aids ............................................. 24

8.1 Electrical characteristics ...................................................................................... 24

8.1.1 General ....................................................................................................... 24

---------------------- Page: 8 ----------------------
SIST EN 60118-0:2015
IEC 60118-0:2015 © IEC 2015 – 3 –

8.1.2 Input impedance .......................................................................................... 25

8.1.3 Input sensitivity ............................................................................................ 25

8.2 Mechanical characteristics and electrical function of connector system for

electrical input..................................................................................................... 25

9 Additional optional test procedures .............................................................................. 25

9.1 General ............................................................................................................... 25

9.2 Effects of tone control and gain control ................................................................ 25

9.2.1 Basic frequency response: effect of tone control ........................................... 25

9.2.2 Frequency response: effect of gain control position ....................................... 25

9.2.3 Characteristics of the gain control ................................................................ 26

9.3 Intermodulation distortion .................................................................................... 26

9.4 Effects of variation of battery or supply voltage and internal resistance ................ 26

9.4.1 Full-on gain .................................................................................................. 26

9.4.2 OSPL90 ....................................................................................................... 27

9.4.3 Total harmonic distortion .............................................................................. 27

9.4.4 Total intermodulation distortion .................................................................... 27

9.5 Equivalent input noise in one-third-octave bands ................................................. 27

9.6 Additional measurements for hearing aids having induction pick-up coil ................ 30

9.6.1 General ....................................................................................................... 30

9.6.2 Basic frequency response ............................................................................ 30

9.6.3 Frequency response with full-on gain control setting ..................................... 30

9.6.4 Effect of gain control position on frequency response .................................... 30

9.6.5 Harmonic distortion ...................................................................................... 31

9.7 Additional measurements for hearing aids having induction pick-up coil for

use with a telephone ........................................................................................... 31

9.7.1 General ....................................................................................................... 31

9.7.2 SPLITS response curve ................................................................................ 32

9.7.3 HFA-SPLITS ................................................................................................ 32

9.7.4 Relative simulated equivalent telephone sensitivity (RSETS)......................... 32

9.8 Additional measurements applying to AGC hearing aids ....................................... 33

9.8.1 General ....................................................................................................... 33

9.8.2 Steady-state input-output characteristics ...................................................... 33

9.8.3 Dynamic AGC characteristics (attack and release time) ................................ 34

9.9 Additional optional measurements with ear simulator, according to

IEC 60318-4 ........................................................................................................ 34

9.9.1 General ....................................................................................................... 34

9.9.2 Output sound pressure level frequency response curve for an input

sound pressure level of 90 dB ...................................................................... 34

9.9.3 Full-on gain response curve ......................................................................... 34

9.9.4 Basic frequency response curve ................................................................... 34

9.9.5 Presentation of data ..................................................................................... 34

10 Maximum permitted expanded uncertainty of measurements ......................................... 34

Bibliography ....................................................................................................................... 36

Figure 1 – Example of test arrangement for behind-the-ear hearing aid ................................ 16

Figure 2 – Example of test arrangement for in-the-ear hearing aid ....................................... 17

Figure 3 – Example of test arrangement for directional hearing aid ...................................... 18

Figure 4 – Example of OSPL90 curve and basic frequency response curve .......................... 21

---------------------- Page: 9 ----------------------
SIST EN 60118-0:2015
– 4 – IEC 60118-0:2015 © IEC 2015
Figure 5 – Example of determination of frequency range from basic frequency

response curve ................................................................................................................... 22

Figure 6 – Example of hearing aid acoustic gain .................................................................. 28

Figure 7 – Example of hearing aid output noise and test equipment noise ............................ 29

Figure 8 – Hearing aid equivalent input noise and ambient noise ......................................... 29

Figure 9 – Telephone magnetic field simulator (TMFS) ........................................................ 31

Figure 10 – Example of hearing aids on TMFS for SPLITS test ............................................ 32

Figure 11 – Example of a steady-state input-output characteristic ........................................ 33

Table 1 – Resistors and open circuit voltages for zinc-air battery simulators ......................... 19

Table 2 – Distortion test frequencies and input sound pressure levels .................................. 23

Table 3 – Values of U for basic measurements .............................................................. 35

max
---------------------- Page: 10 ----------------------
SIST EN 60118-0:2015
IEC 60118-0:2015 © IEC 2015 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
HEARING AIDS –
Part 0: Measurement of the performance
characteristics of hearing aids
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 standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication 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 Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60118-0 has been prepared by IEC technical committee 29:

Electroacoustics.

This third edition cancels and replaces the second edition published in 1983 and its

Amendment 1:1994 as well as IEC 60118-1:1995, Amendment 1:1998, IEC 60118-2:1983,

Amendment 1:1993, Amendment 2:1997 and IEC 60118-6:1999. This edition constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) the use of an acoustic coupler according to IEC 60318-5;

b) the addition of measurements for automatic gain control circuits, for induction pick-up coil

inputs and for electrical inputs.
---------------------- Page: 11 ----------------------
SIST EN 60118-0:2015
– 6 – IEC 60118-0:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
29/867A/FDIS 29/874/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60118 series, published under the general title Electroacoustics –

Hearing aids, can be found on the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 12 ----------------------
SIST EN 60118-0:2015
IEC 60118-0:2015 © IEC 2015 – 7 –
ELECTROACOUSTICS –
HEARING AIDS –
Part 0: Measurement of the performance
characteristics of hearing aids
1 Scope

This part of IEC 60118 gives recommendations for the measurement of the performance

characteristics of air conduction hearing aids based on a free field technique and measured

with an acoustic coupler.
This part of IEC 60118 is applicable to the measurement and evaluation of the

electroacoustical characteristics of hearing aids, for example for type testing and

manufacturer data sheets.

The test results obtained by the methods specified in this part of IEC 60118 will express the

performance under conditions of the test and may deviate substantially from the performance

of the hearing aid under actual conditions of use.

This part of IEC 60118 uses an acoustic coupler according to IEC 60318-5 which is only

intended for loading a hearing aid with a specified acoustic impedance and is not intended to

model the sound pressure in a person’s ear. The use of this acoustic coupler will yield

different results from those obtained using the occluded ear simulator of IEC 60318-4 as used

in former editions of IEC 60118-0.

For the measurement of the performance characteristics of hearing aids for simulated in situ

working conditions, IEC 60118-8 can be used. For measurement of hearing aids under typical

user settings and using a speech-like signal, IEC 60118-15 can be used.

For the measurement of the performance characteristics of hearing aids for production, supply

and delivery quality-assurance purposes, IEC 60118-7 can be used. The frequency range has

been extended to 8 kHz in this part of IEC 60118 as opposed to 5 kHz in IEC 60118-7.

Though the number of measurements covered by this part of IEC 60118 is limited, it is not

intended that all measurements described herein are mandatory.

In cases of custom-made in-the-ear instruments, the data supplied by the manufacturer

applies only to the particular hearing aid being tested.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60318-5, Electroacoustics – Simulators of human head and ear – Part 5: 2 cm coupler

for the measurement of hearing aids and earphones coupled to the ear by means of ear

inserts
ISO 3, Preferred numbers -- Series of preferred numbers
---------------------- Page: 13 ----------------------
SIST EN 60118-0:2015
– 8 – IEC 60118-0:2015 © IEC 2015
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
hearing aid
wearable instrument intended to aid a person with impaired hearing

Note 1 to entry: A hearing aid usually consists of a microphone, amplifier, signal processor and earphone,

powered by a low-voltage battery and possibly also containing an induction pick-up coil. It is fitted using

audiometric and prescriptive methods.

Note 2 to entry: Hearing aids can be placed on the body (BW), behind the ear (BTE), in the ear (ITE) or in the

canal (ITC).
3.2
SPL
sound pressure level

ten times the logarithm to the base 10 of the ratio of the square of the sound pressure, p, to

the square of a reference value, p , expressed in decibels, where the reference value, p , is

0 0
20 µPa
Note 1 to entry: This note applies to the French language only.
[SOURCE: ISO/TR 25417:2007, 2.2]
3.3
acoustic coupler

device for measuring the acoustic output of sound sources where the sound pressure is

measured by a calibrated microphone coupled to the source by a cavity of predetermined

shape and volume which does not necessarily approximate the acoustical impedance of the

normal human ear
3.4
ear simulator

device for measuring the acoustic output of sound sources where the sound pressure is

measured by a calibrated microphone coupled to the source so that the overall acoustic

impedance of the device approximates that of the normal human ear at a given location and in

a given frequency band
[SOURCE: IEC 60318-4:2010, 3.4]
3.5
input sound pressure level
sound pressure level at the hearing aid reference point
3.6
frequency response

sound pressure level measured in the acoustic coupler expressed as a function of frequency

under specified test conditions
3.7
basic frequency response curve

frequency response curve obtained at RTS with an input sound pressure level of 60 dB

3.8
input-output characteristic

for a single frequency, a plot of the sound pressure level measured in the acoustic coupler on

the ordinate, against the sound pressure level applied to the hearing aid on the abscissa, with

equal decibel scale divisions on each axis
---------------------- Page: 14 ----------------------
SIST EN 60118-0:2015
IEC 60118-0:2015 © IEC 2015 – 9 –
3.9
vertical reference

line through or on a hearing aid which is vertical when the aid is positioned as worn on a head

and torso simulator (as per Figure C.1 in IEC 60118-8:2005) or, in the case of custom-made

hearing aids, as worn by a seated individual
3.10
reference point
point on the hearing aid chosen for the purpose of defining its position
3.11
test point
positi
...

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