EN 60118-15:2012

Electroacoustics - Hearing aids - Part 15: Methods for characterising signal processing in hearing aids with a speech-like signal

IEC 60118-15:2012 specifies a test signal designed to represent normal speech, the International Speech Test Signal (ISTS), together with the procedures and the requirements for measuring the characteristics of signal processing in air-conduction hearing aids. The measurements are used to derive the estimated insertion gain (EIG). For the purposes of characterizing a hearing aid for production, supply and delivery, the procedures and requirements to derive the coupler gain on a 2 cm3 coupler as defined in IEC 60318-5 are also specified. The purpose of this standard is to ensure that the same measurements made on a hearing aid following the procedures described, and using equipment complying with these requirements, give substantially the same results. Measurement methods that take into account the acoustic coupling of a hearing aid to the individual ear and the acoustic influence of the individual anatomical variations of an end-user on the acoustical performance of the hearing aid, known as real-ear measurements, are outside the scope of this particular standard.

Akustik - Hörgeräte - Teil 15: Methoden zur Charakterisierung der Hörgeräte-Signalverarbeitung

Electroacoustique - Appareils de correction auditive - Partie 15: Méthodes de caractérisation du traitement des signaux dans les appareils de correction auditive avec un signal de type parole

La CEI 60118-15:2012 spécifie un signal d'essai conçu pour représenter la parole normale, le signal vocal international de test (ISTS), ainsi que les procédures et les exigences relatives à la mesure des caractéristiques de traitement des signaux dans les appareils de correction auditive à conduction aérienne. Les mesures sont utilisées pour obtenir le gain d'insertion estimé (EIG, estimated insertion gain). Pour les besoins de la caractérisation d'un appareil de correction auditive aux fins de production, de livraison et d'approvisionnements, les procédures et exigences pour obtenir le gain de coupleur à l'aide d'un coupleur de 2 cm3 tel que défini dans la CEI 60318-5 sont également spécifiées. Le but de la présente norme est de garantir que les mêmes mesures effectuées sur un appareil de correction auditive en suivant les procédures décrites, et en utilisant l'appareillage conformément à ces exigences, donnent pratiquement les mêmes résultats. Les méthodes de mesure qui tiennent compte du couplage acoustique d'un appareil de correction auditive à l'oreille individuelle et de l'influence acoustique des variations anatomiques individuelles d'un utilisateur final sur les performances acoustiques de l'appareil de correction auditive, connues sous le nom de mesures d'oreille réelle, sont en dehors du domaine d'application de la présente norme particulière.

Elektroakustika - Slušni pripomočki - 15. del: Metode za ugotavljanje lastnosti obdelave signalov v slušnih pripomočkih s signali, podobnimi govoru

Akustične meritve, akustične značilnosti in pojavi, akustično preskušanje, akustika, akustično-električne naprave, avdiometri, slušni prag, podatki, definicije, ušesa, elektroakustika, frekvence, meritev frekvence, funkcionalne značilnosti, slušna sposobnost, slušni pripomočki, sluh (slušno zaznavanje), izmenjava informacij, meritev, merilni pogoji, merilni instrumenti, merilne tehnike, hrup, hrup (okoljski), nominalne vrednosti, natančnost, značilnosti, preskušanje kakovosti, ocene, občutljivost, obdelava signala, signali, zvok, zvočna polja, raven zvočnega tlaka, zvočni viri, specifikacija (odobritev), razumljivost govora, preskusni signali, preskušanje, preskusni pogoji, prenos, značilnosti prenosa

General Information

• Status: Published
• Publication Date: 12-Apr-2012
• Withdrawal Date: 26-Mar-2015
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: CLC/SR 29 - Electroacoustics
• Drafting Committee: IEC/TC 29 - IEC_TC_29
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 13-Apr-2012
• Completion Date: 13-Apr-2012
• Ref Project: SIST EN 60118-15:2012 - Electroacoustics - Hearing aids - Part 15: Methods for characterising signal processing in hearing aids with a speech-like signal

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2012
(OHNWURDNXVWLND6OXãQLSULSRPRþNLGHO0HWRGH]DXJRWDYOMDQMHODVWQRVWL
REGHODYHVLJQDORYYVOXãQLKSULSRPRþNLKVVLJQDOLSRGREQLPLJRYRUX
Electroacoustics - Hearing aids - Part 15: Methods for characterising signal processing in
hearing aids with a speech-like signal
Akustik - Hörgeräte - Teil 15: Methoden zur Charakterisierung der Hörgeräte-
Signalverarbeitung
Electroacoustique - Appareils de correction auditive - Partie 15: Méthodes de
caractérisation du traitement des signaux dans les appareils de correction auditive avec
un signal de type parole
Ta slovenski standard je istoveten z: EN 60118-15:2012
ICS:
11.180.15 3ULSRPRþNL]DJOXKHRVHEHLQ Aids for deaf and hearing
RVHEH]RNYDURVOXKD impaired people
17.140.50 Elektroakustika Electroacoustics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60118-15
NORME EUROPÉENNE
April 2012
EUROPÄISCHE NORM
ICS 17.140.50
English version
Electroacoustics -
Hearing aids -
Part 15: Methods for characterising signal processing in hearing aids with
a speech-like signal
(IEC 60118-15:2012)
Electroacoustique -  Akustik -
Appareils de correction auditive - Hörgeräte -
Partie 15: Méthodes de caractérisation du Teil 15: Methoden zur Charakterisierung
traitement des signaux dans les appareils der Hörgeräte-Signalverarbeitung
de correction auditive avec un signal de (IEC 60118-15:2012)
type parole
(CEI 60118-15:2012)
This European Standard was approved by CENELEC on 2012-03-27. 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, 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.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60118-15:2012 E
Foreword
The text of document 29/719/CDV, future edition 1 of IEC 60118-15, prepared by IEC/TC 29
"Electroacoustics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
(dop) 2012-12-27
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-03-27
• latest date by which the national
standards conflicting with the
document have to be withdrawn
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 60118-15:2012 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61669 NOTE  Harmonized as EN 61669.
IEC 60118-0:1983 NOTE  Harmonized as EN 60118-0:1993 + A1:1994 (not modified).
+ A1:1994
- 3 - EN 60118-15:2012
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60118-7 - Electroacoustics - Hearing aids - EN 60118-7 -
Part 7: Measurement of the performance
characteristics of hearing aids for production,
supply and delivery quality assurance
purposes
IEC 60118-8 2005 Electroacoustics - Hearing aids - EN 60118-8 2005
Part 8: Methods of measurement of
performance characteristics of hearing aids
under simulated in situ working conditions

IEC 60318-4 - Electroacoustics - Simulators of human head EN 60318-4 -
and ear -
Part 4: Occluded-ear simulator for the
measurement of earphones coupled to the ear
by means of ear inserts
IEC 60318-5 - Electroacoustics - Simulators of human head EN 60318-5 -
and ear -
Part 5: 2 cm³ coupler for the measurement of
hearing aids and earphones coupled to the
ear by means of ear inserts
IEC 61260 - Electroacoustics - Octave-band and EN 61260 -
fractional-octave-band filters

IEC 60118-15 ®
Edition 1.0 2012-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Hearing aids –

Part 15: Methods for characterising signal processing in hearing aids with a

speech-like signal
Électroacoustique – Appareils de correction auditive –

Partie 15: Méthodes de caractérisation du traitement des signaux dans les

appareils de correction auditive avec un signal de type parole

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 17.140.50 ISBN 978-2-88912-932-4

– 2 – 60118-15  IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Limitations . 9
5 Setup . 9
5.1 System overview . 9
5.2 Estimated insertion gain . 11
5.3 Coupler gain . 12
6 Test equipment . 12
6.1 Acoustical requirements . 12
6.2 Test signal . 13
6.2.1 Specification of ISTS . 13
6.2.2 Shaping of the test signal for determining the EIG . 14
6.3 Earphone coupler and attachments . 15
6.3.1 Estimated insertion gain . 15
6.3.2 Coupler gain . 15
7 Test conditions . 15
7.1 Programming of hearing aid . 15
7.2 End user settings for programming . 16
7.2.1 Hearing aid features . 16
7.2.2 Vent selection for programming . 16
7.2.3 Directionality . 16
7.3 Audiograms for a typical end-user . 16
8 Measurements and analysis . 18
8.1 Measurements . 18
8.1.1 General . 18
8.1.2 Estimated insertion gain (EIG) . 19
8.1.3 Coupler gain (optional for 2 cm coupler) . 19
8.2 Analysis . 19
8.2.1 General . 19
8.2.2 Compensating for hearing aid processing delay . 21
8.2.3 Correction for use of 2 cm coupler for EIG determination . 21
8.2.4 Calculation of the estimated insertion gain for the LTASS of the ISTS
(LTASS EIG) . 21
8.2.5 Calculation of the coupler gain for the LTASS of the ISTS (LTASS
coupler gain) (optional) . 22
8.2.6 Sectioning of recorded signals for percentile calculations . 22
th th th
8.2.7 Calculation of the EIG for the 30 , 65 and 99 percentiles of the
ISTS (percentile EIG) . 23
th th th
8.2.8 Calculation of the coupler gain for the 30 , 65 and 99 percentiles
of the ISTS (Percentile coupler gain) (optional) . 23
9 Data presentation . 24
9.1 LTASS gain (LTASS EIG or LTASS coupler gain) . 24
9.2 Percentile gain (percentile EIG or percentile coupler gain) . 25

60118-15  IEC:2012 – 3 –
9.3 Interpretation of gain views . 26
9.3.1 LTASS gain view . 26
9.3.2 Percentile gain view . 26
9.4 Mandatory data . 27
Annex A (informative) International speech test signal (ISTS) . 28
Bibliography . 32

Figure 1 – Measurement setup for the estimated insertion gain . 11
Figure 2 – Measurement setup for the coupler gain. 12
th th th
Figure 3 – ISTS 30 , 65 , 99 percentiles and LTASS in dB versus one-third-octave
bands . 14
Figure 4 – Standard audiograms for the flat and moderately sloping group . 17
Figure 5 – Standard audiograms for the steep sloping group . 18
Figure 6 – Overview of analysis . 20
Figure 7 – Time alignment of output signal (y) relative to the input signal (x) . 21
Figure 8 – Sectioning of recorded signals . 22
th
Figure 9 – Illustration of the method for obtaining "time aligned gain" for the 65
percentile . 24
Figure 10 – LTASS gain at 3 input sound pressure levels . 24
...