EN IEC 60268-24:2024

SLOVENSKI STANDARD
01-julij-2024
Oprema zvokovnega sistema - 24. del: Naglavne in ušesne slušalke -
Karakteristike aktivnega odpravljanja šumov (IEC 60268-24:2023)
Sound system equipment - Part 24: Headphones and earphones - Active acoustic noise
cancelling characteristics (IEC 60268-24:2023)
Elektroakustische Geräte - Teil 24: Kopfhörer und Ohrhörer - Eigenschaften zur aktiven
Geräuschunterdrückung (IEC 60268-24:2023)
Equipements pour systèmes électroacoustiques - Partie 24: Casques et écouteurs -
Caractéristiques d'annulation active du bruit acoustique (IEC 60268-24:2023)
Ta slovenski standard je istoveten z: EN IEC 60268-24:2024
ICS:
33.160.50 Pribor Accessories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60268-24

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2024
ICS 33.160.01
English Version
Sound system equipment - Part 24: Headphones and earphones
- Active acoustic noise cancelling characteristics
(IEC 60268-24:2023)
Équipements pour systèmes électroacoustiques - Partie 24: Elektroakustische Geräte - Teil 24: Kopfhörer und Ohrhörer
Casques et écouteurs - Caractéristiques d'annulation active - Eigenschaften zur aktiven Geräuschunterdrückung
du bruit acoustique (IEC 60268-24:2023)
(IEC 60268-24:2023)
This European Standard was approved by CENELEC on 2024-01-04. 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60268-24:2024 E

European foreword
The text of document 100/3880/CDV, future edition 1 of IEC 60268-24, prepared by Technical Area 20
Analogue and digital audio, of IEC technical committee 100: Audio, video and multimedia systems and
equipment, was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-10-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-01-04
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 shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60268-24:2023 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 standard indicated:
ISO 4869-1:2018 NOTE Approved as EN ISO 4869-1:2018 (not modified)
ISO 11904-1:2002 NOTE Approved as EN ISO 11904-1:2002 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where 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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60268-7 - Sound system equipment - Part 7: EN 60268-7 -
Headphones and earphones
IEC 60318-4 - Electroacoustics - Simulators of human EN 60318-4 -
head and ear - Part 4: Occluded-ear
simulator for the measurement of
earphones coupled to the ear by means of
ear inserts
IEC 60318-7 - Electroacoustics - Simulators of human EN IEC 60318-7 -
head and ear - Part 7: Head and torso
simulator for the measurement of sound
sources close to the ear
IEC 61260-1 - Electroacoustics - Octave-band and EN 61260-1 -
fractional-octave-band filters - Part 1:
Specifications
IEC 61672-1 - Electroacoustics - Sound level meters - EN 61672-1 -
Part 1: Specifications
ISO 532-1 2017 Acoustics - Method for calculating - -
loudness - Part 1: Zwicker method
ISO 3741 2010 Acoustics - Determination of sound power EN ISO 3741 2010
levels and sound energy levels of noise
sources using sound pressure - Precision
methods for reverberation test rooms
ANSI/ASA S12.42 2010 Methods for the Measurement of Insertion - -
Loss of Hearing Protection Devices in
Continuous or Impulsive Noise Using
Microphone-in-Real-Ear or Acoustic Test
Fixture Procedures
ITU-T - Head and torso simulator for - -
Recommendation telephonometry
P.58
IEC 60268-24 ®
Edition 1.0 2023-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Sound system equipment –
Part 24: Headphones and earphones – Active acoustic noise cancelling

characteristics
Équipements pour systèmes électroacoustiques –

Partie 24: Casques et écouteurs – Caractéristiques d'annulation active du bruit

acoustique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.01  ISBN 978-2-8322-7882-6

– 2 – IEC 60268-24:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Measurement method for noise cancelling characteristics . 9
4.1 Characteristics to be specified . 9
4.2 Test signals . 10
4.2.1 Pink noise . 10
4.2.2 Simulated ambient noise . 10
4.3 Nominal environmental conditions . 13
4.3.1 General . 13
4.3.2 Test site . 13
4.3.3 Background noise . 13
4.4 Test equipment . 14
4.4.1 Playback equipment for test signals . 14
4.4.2 Acoustic test equipment . 14
4.4.3 Analysis equipment. 14
4.5 Test procedure for measurement of noise suppression level . 15
4.5.1 Adjustment of sound pressure level of test signals . 15
4.5.2 Sound pressure level measurement at HP-OFF condition . 15
4.5.3 Sound pressure level measurement at ANC-OFF condition . 15
4.5.4 Sound pressure level measurement at ANC-ON condition. 15
4.6 Test procedure for measurement of noise suppression loudness. 16
4.6.1 Adjustment of loudness of test signals . 16
4.6.2 Loudness measurement at HP-OFF condition . 16
4.6.3 Loudness measurement at ANC-OFF condition . 16
4.6.4 Loudness measurement at ANC-ON condition . 16
4.7 Reporting of data . 16
4.7.1 Insertion Loss . 16
4.7.2 Noise suppression ratio . 17
Annex A (normative) Pseudo-diffuse sound field for measurement of ANC headphones . 18
Annex B (informative) Example of reporting of data . 20
Annex C (informative) Examples of filter circuits for making simulated ambient noise . 22
Annex D (informative) Procedure for real ear measurements . 24
Bibliography . 25

Figure 1 – Tolerance limit of power spectrum of simulated aircraft cabin noise . 11
Figure 2 – Tolerance limit of power spectrum of simulated train compartment noise . 12
Figure 3 – Tolerance limit of power spectrum of simulated cafeteria noise . 13
Figure 4 – Example of noise-cancelling characteristic measurement system . 15
Figure A.1 – Measurement reference point and sound pressure level confirmation point . 18
Figure B.1 – Example of reporting of insertion loss performance . 20
Figure C.1 – Example of filter circuit for making simulated aircraft cabin noise. 22
Figure C.2 – Example of filter circuit for making simulated train compartment noise . 23

IEC 60268-24:2023 © IEC 2023 – 3 –

Table 1 – Power spectrum of simulated aircraft cabin noise . 10
Table 2 – Power spectrum of simulated train compartment noise . 11
Table 3 – Power spectrum of simulated cafeteria noise . 12
Table B.1 – Example of reporting of insertion loss performance . 21
Table B.2 – Example of reporting of noise suppression ratio performance . 21

– 4 – IEC 60268-24:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOUND SYSTEM EQUIPMENT –
Part 24: Headphones and earphones –
Active acoustic noise cancelling characteristics

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 decis
...