Amendment 1 - Sound system equipment - Part 7: Headphones and earphones

Amendement 1 - Equipements pour systèmes électroacoustiques - Partie 7: Casques et écouteurs

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Status
Published
Publication Date
14-Sep-2020
Current Stage
PPUB - Publication issued
Completion Date
15-Sep-2020
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IEC 60268-7
Edition 3.0 2020-09
INTERNATIONAL
STANDARD
AMENDMENT 1
Sound system equipment –
Part 7: Headphones and earphones
IEC 60268-7:2010-01/AMD1:2020-09(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2020 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
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---------------------- Page: 2 ----------------------
IEC 60268-7
Edition 3.0 2020-09
INTERNATIONAL
STANDARD
AMENDMENT 1
Sound system equipment –
Part 7: Headphones and earphones
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.50 ISBN 978-2-8322-8763-7

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60268-7:2010/AMD1:2020
© IEC 2020
FOREWORD

This amendment has been prepared by technical area 20: Analogue and digital audio, of IEC

technical committee 100: Audio, video and multimedia systems and equipment
The text of this International Standard is based on the following documents:
CDV Rapport de vote
100/3316/CDV 100/3437/RVC

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

voting indicated in the above table.

The committee has decided that the contents of this amendment and the base 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.
_____________
INTRODUCTION to Amendment 1

This Amendment 1 contains the following significant technical changes with respect to

IEC 60268-7:2010:
• evaluation of free-field compensated frequency response has been added;
• evaluation of diffuse-field compensated frequency response has been added;
• the Bibliography has been updated;
• some normative references have been updated;
• the term "HATS" and its definition has been added.
1 Scope
In item a), replace “IEC 60065” with “IEC 62368-1”.
2 Normative references
Add the following new reference:

IEC TS 60318-7, Electroacoustics – Simulators of human head and ear – Part 7: Head and torso

simulator for the measurement of air-conduction hearing aids
---------------------- Page: 4 ----------------------
IEC 60268-7:2010/AMD1:2020 – 3 –
 IEC:2020
3 Terms and definitions
Add, after the existing term 3.16, the following new term.
3.17
head and torso simulator
HATS

simulator of a median adult human head and part of the torso extending in total from the top of

the head to the waist and designed to simulate the sound pick-up characteristics and acoustic

diffraction

Note 1 to entry: The head simulator includes two pinna simulators, and at least one occluded-ear simulator.

[SOURCE: IEC TS 60318-7:2017, 3.1, modified – The preferred term "manikin" has been

omitted.]
Add, after 8.6.6, the following new Subclauses 8.6.7, 8.6.8 and Figure 4.
8.6.7 Free-field compensated frequency response
8.6.7.1 Characteristics to be specified

The frequency response measured at the ear simulator of the HATS is compensated either

during the measurement by inverse filtering with the 0° free-field response of the HATS, or by

subtracting (in dB) the 0° free-field frequency response of the HATS from the uncompensated

measured headphone response at the ear simulator of the HATS as a post-process operation.

8.6.7.2 Method of measurement

• The headphone is brought under standard conditions for measurement, and a test signal at

the rated source voltage is applied in series with the rated source impedance.

• The frequency is then varied over at least the rated frequency range of the headphone (see

8.6.6), and the sound pressure (level) at each frequency is noted for both the right and the

left ear.

NOTE Ideally, the values for both ears are equal. Reasons for differences in practice can include non-

symmetrical positioning of the headphone or wider tolerances of the headphone transducers.

• The output of the ear simulator of the HATS with or without compensation shall be at least

10 dB above the noise floor of the measurement system at all measured frequencies.

The nominal frequency response is obtained from a power average of the five measurements

and finally graphically presented in decibels referred to the value at the standard reference

frequency. The headphones shall be removed and remounted to the HATS before each
measurement.
8.6.7.3 HATS
The HATS used for measurement shall comply with IEC TS 603
...

IEC 60268-7
Edition 3.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Sound system equipment –
Part 7: Headphones and earphones
Équipements pour systèmes électroacoustiques –
Partie 7: Casques et écouteurs
IEC 60268-7:2010-01/AMD1:2020-09(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2020 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch

The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the

variety of criteria (reference number, text, technical publications previews. With a subscription you will always

committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.

and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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---------------------- Page: 2 ----------------------
IEC 60268-7
Edition 3.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Sound system equipment –
Part 7: Headphones and earphones
Équipements pour systèmes électroacoustiques –
Partie 7: Casques et écouteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.50 ISBN 978-2-8322-9439-0

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 60268-7:2010/AMD1:2020
© IEC 2020
FOREWORD

This amendment has been prepared by technical area 20: Analogue and digital audio, of IEC

technical committee 100: Audio, video and multimedia systems and equipment
The text of this International Standard is based on the following documents:
CDV Rapport de vote
100/3316/CDV 100/3437/RVC

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

voting indicated in the above table.

The committee has decided that the contents of this amendment and the base 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.
_____________
INTRODUCTION to Amendment 1

This Amendment 1 contains the following significant technical changes with respect to

IEC 60268-7:2010:
• evaluation of free-field compensated frequency response has been added;
• evaluation of diffuse-field compensated frequency response has been added;
• the Bibliography has been updated;
• some normative references have been updated;
• the term "HATS" and its definition has been added.
1 Scope
In item a), replace “IEC 60065” with “IEC 62368-1”.
2 Normative references
Add the following new reference:

IEC TS 60318-7, Electroacoustics – Simulators of human head and ear – Part 7: Head and torso

simulator for the measurement of air-conduction hearing aids
---------------------- Page: 4 ----------------------
IEC 60268-7:2010/AMD1:2020 – 3 –
 IEC 2020
3 Terms and definitions
Add, after the existing term 3.16, the following new term.
3.17
head and torso simulator
HATS

simulator of a median adult human head and part of the torso extending in total from the top of

the head to the waist and designed to simulate the sound pick-up characteristics and acoustic

diffraction

Note 1 to entry: The head simulator includes two pinna simulators, and at least one occluded-ear simulator.

[SOURCE: IEC TS 60318-7:2017, 3.1, modified – The preferred term "manikin" has been

omitted.]
Add, after 8.6.6, the following new Subclauses 8.6.7, 8.6.8 and Figure 4.
8.6.7 Free-field compensated frequency response
8.6.7.1 Characteristics to be specified

The frequency response measured at the ear simulator of the HATS is compensated either

during the measurement by inverse filtering with the 0° free-field response of the HATS, or by

subtracting (in dB) the 0° free-field frequency response of the HATS from the uncompensated

measured headphone response at the ear simulator of the HATS as a post-process operation.

8.6.7.2 Method of measurement

• The headphone is brought under standard conditions for measurement, and a test signal at

the rated source voltage is applied in series with the rated source impedance.

• The frequency is then varied over at least the rated frequency range of the headphone (see

8.6.6), and the sound pressure (level) at each frequency is noted for both the right and the

left ear.

NOTE Ideally, the values for both ears are equal. Reasons for differences in practice can include non-

symmetrical positioning of the headphone or wider tolerances of the headphone transducers.

• The output of the ear simulator of the HATS with or without compensation shall be at least

10 dB above the noise floor of the measurement system at all measured frequencies.

The nominal frequency response is obtained from a power average of the five measurements

and finally graphically presented in decibels referred to the value at the standard reference

frequency. The headphones shall be removed and remounted to the HATS before each
measurement.
8.6.7.3 HATS

The HATS used for measurement shall comply with IEC TS 60318-7, however with the pinna

simulator specified in IEC 60268-7:2010, Annex A. Otherwise, the type of pinna simulator shall

be stated with the measurement results.

NOTE For use of a HATS outside the scope of IEC TS 60318-7, that scope recommends that a statistical analysis

of the measurement data be carried out to determine the level of repeatability that can be achieved. This is especially

necessary for measurements at frequencies higher than 16 kHz. Detailed requirements for these are under

consideration.
8.6.7.4 Characteristics to be stated

Measured free-field compensated frequency response should be stated together with at least

one of the following characteristics:
---------------------- Page: 5 ----------------------
– 4 – IEC 60268-7:2010/AMD1:2020
© IEC 2020
• the free-field response of the HATS used in the measurements;

• the frequency response of the headphones measured with the HATS without free-field

compensation.

An example of a setup for the measurement of free-field compensated frequency response is

shown in Figure 4.
8.6.8 Diffuse-field compensated frequency response
8.6.8.1 Characteristics to be specified

The frequency response measured at the ear simulator of the HATS is compensated either

during the measurement by inverse filtering with the diffuse-field response of the HATS, or by

subtracting (in dB) the diffuse-field frequency response of the HATS from the uncompensated

measured headphone response at the ear simulator of the HATS as a post-process operation.

8.6.8.2 Method of measurement

• The headphone is brought under standard conditions for measurement, and a test signal at

the rated source voltage is applied in series with the rated source impedance.

• The frequency is then varied over at least the rated frequency range of the headphones (see

8.6.6), and the sound pressure (level) at each frequency is noted for both the right and the

left ear.

NOTE Ideally, the values for both ears are equal. Reasons for differences in practice can include non-

symmetrical positioning of the headphones or wider tolerances of the headphone transducers.

• The output of the ear simulator of the HATS with or without compensation shall be at least

10 dB above the noise floor of the measurement system at all measured frequencies.

The nominal frequency response is obtained from a power average of the five measurements

and finally graphically presented in decibels referred to the value at the standard reference

frequency. The headphones shall be removed and remounted to the HATS before each
measurement.
8.6.8.3 HATS

The HATS used for measurement shall comply with IEC TS 60318-7, however with the pinna

simulator specified in IEC 60268-7:2010, Annex A. Otherwise, the type of pinna simulator shall

be stated with the measurement results.

NOTE For use of a HATS outside the scope of IEC TS 60318-7, that scope recommends that a statistical analysis

of the measurement data be carried out to determine the level of repeatability that can be achieved. This is especially

necessary for measurements at frequencies higher than 16 kHz. Detailed requirements for these are under

consideration.
8.6.8.4 Characteristics to be stated

Measured diffuse-field compensated frequency response should be stated together with at least

one of the following characteristics:
• the diffuse-field response of the HATS used in the measurements;

• the frequency response of the headphones measured with the HATS without diffuse-field

compensation.

An example of a setup for the measurement of diffuse-field compensated frequency response

is shown in Figure 4.
---------------------- Page: 6 ----------------------
IEC 60268-7:2010/AMD1:2020 – 5 –
 IEC 2020
Free-field/diffuse-field compensation can also be done by post processing.
Figure 4 – Example of a setup for the measurement of
free-field/ diffuse-field compensated frequency response
---------------------- Page: 7 ----------------------
– 6 – IEC 60268-7:2010/AMD1:2020
© IEC 2020
Replace the existing entire bibliographical references with the following:
Bibliography

IEC 60118-0, Hearing aids – Part 0: Measurement of the performance characteristics of hearing

aids
IEC 60268-3, Sound system equipment – Part 3: Amplifiers
IEC 60268-4, Sound system equipment – Part 4: Microphones
IEC 60268-5, Sound system equipment – Part 5: Loudspeakers

IEC 60318-1, Electroacoustics – Simulators of human head and ear – Part 1: Ear simulator for

the measurement of supra-aural and circumaural earphones

IEC 60318-2, Electroacoustics – Simulators of human head and ear – Part 2: An interim acoustic

coupler for the calibration of audiometric earphones in the extended high-frequency range

IEC 60318-3, Electroacoustics – Simulators of human head and ear – Part
...

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