SIST EN 60268-7:2011
(Main)Sound system equipment - Part 7: Headphones and earphones (IEC 60268-7:2010)
Sound system equipment - Part 7: Headphones and earphones (IEC 60268-7:2010)
This part of IEC 60268, is applicable to headphones, headsets, earphones and earsets, intended to be used on, or in, the human ear. It also applies to equipment, such as pre-amplifiers, passive networks and power supplies which form an integral part of the headphone system. It does not deal with: a) safety, for which reference should be made to IEC 60065 or another appropriate standard; b) the characteristics of microphones of headsets, for which reference should be made to IEC 60268-4; c) earphones and other devices for hearing aids, for which reference should be made to IEC 60118-0; d) headphones for audiometry; e) headphones and other devices which form part of an active ear-defender system, although some of its provisions may be applicable. This standard specifies the characteristics which should be included by the manufacturer in specifications, and relevant methods of measurement. It includes a classification of the different types of earphone, mainly characterized by the way in which the transducer is coupled acoustically to the ear, and a classification code which may also be used for marking.
Elektroakustische Geräte - Teil 7: Kopfhörer und Ohrhörer (IEC 60268-7:2010)
Equipements pour systèmes électroacoustiques - Partie 7: Ecouteurs et oreillettes (CEI 60268-7:2010)
L'IEC 60268-7:2010 s'applique aux casques, aux casques téléphoniques, aux écouteurs, et aux écouteurs téléphoniques destinés à être utilisés sur ou dans l'oreille humaine. Elle s'applique également aux équipements, tels que les préamplificateurs, les réseaux passifs et les alimentations qui font partie intégrante du système de casque.
Elle ne traite pas:
a) de la sécurité, pour laquelle il convient de se référer à l'IEC 60065 ou à une autre norme appropriée;
b) des caractéristiques des microphones des casques téléphoniques, pour lesquels il convient de se référer à l'IEC 60268-4;
c) des écouteurs et autres appareils de correction auditive, pour lesquels il convient de se référer à l'IEC 60118-0;
d) des casques d'audiométrie;
e) des écouteurs et autres appareils qui font partie d'un système de protection auditive, bien que certaines de ses dispositions puissent être applicables.
La présente norme spécifie les caractéristiques qu'il convient que le fabricant inclue dans les spécifications, ainsi que les méthodes de mesure applicables. Elle comprend une classification des différents types d'écouteurs, principalement caractérisés par la façon dont le transducteur est couplé acoustiquement à l'oreille, ainsi qu'un code de classification qui peut également être utilisé pour le marquage.
L'IEC 60268-7:2010 annule et remplace la deuxième édition publiée en 1996, dont elle constitue une révision technique. La présente édition comprend les modifications suivantes:
- nouvelle numérotation des articles/paragraphes selon les Directives ISO/IEC, Partie 2;
- ajout d'un système de mesure qui utilise un HATS;
- ajout de détails sur les simulateurs de pavillon pour une reproductibilité de mesure élevée (voir Annexe A).
Oprema zvokovnega sistema - 7. del: Naglavne in ušesne slušalke (IEC 60268-7:2010)
Ta del IEC 60268 velja za naglavne slušalke, naglavne slušalke z mikrofonom, ušesne slušalke in ušesne slušalke z mikrofonom za uporabo na ali v človeškem ušesu. Prav tako velja za opremo, kot so predojačevalniki, pasivna omrežja in napajalniki, ki tvorijo sestavni del sistema slušalk. Ne obravnava: a) varnosti, za katero je potrebno sklicevanje na IEC 60065 ali drug primeren standard; b) značilnosti mikrofonov naglavnih slušalk z mikrofonom, za katere je potrebno sklicevanje na IEC 60268-4; c) ušesnih slušalk in drugih naprav za slušne pripomočke, za katere je potrebno sklicevanje na IEC 60118-0; d) naglavnih slušalk za avdiometrijo; e) naglavnih slušalk in drugih naprav, ki tvorijo del aktivnega sistema glušnika, čeprav nekatere njegove določbe lahko veljajo. Ta standard določa značilnosti, ki jih mora proizvajalec vključiti v specifikacije, in ustrezne metode merjenja. Vključuje klasifikacijo različnih vrst ušesnih slušalk, ki jo predvsem določa način akustične povezane pretvornika z ušesom, ter klasifikacijsko kodo, ki se lahko uporablja tudi za označevanje.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60268-7:2011
01-julij-2011
1DGRPHãþD
SIST EN 60268-7:1999
SIST EN 60268-7:1999
Oprema zvokovnega sistema - 7. del: Naglavne in ušesne slušalke (IEC 60268-
7:2010)
Sound system equipment - Part 7: Headphones and earphones (IEC 60268-7:2010)
Elektroakustische Geräte - Teil 7: Kopfhörer und Ohrhörer (IEC 60268-7:2010)
Equipements pour systèmes électroacoustiques - Partie 7: Ecouteurs et oreillettes (CEI
60268-7:2010)
Ta slovenski standard je istoveten z: EN 60268-7:2011
ICS:
33.160.50 Pribor Accessories
SIST EN 60268-7:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60268-7:2011
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SIST EN 60268-7:2011
EUROPEAN STANDARD
EN 60268-7
NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM
ICS 33.160.50 Supersedes EN 60268-7:1996
English version
Sound system equipment -
Part 7: Headphones and earphones
(IEC 60268-7:2010)
Equipements pour systèmes Elektroakustische Geräte -
électroacoustiques - Teil 7: Kopfhörer und Ohrhörer
Partie 7: Ecouteurs et oreillettes (IEC 60268-7:2010)
(CEI 60268-7:2010)
This European Standard was approved by CENELEC on 2011-01-02. 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 Central Secretariat 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 Central Secretariat 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 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
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60268-7:2011 E
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SIST EN 60268-7:2011
EN 60268-7:2011 - 2 -
Foreword
The text of document 100/1621/FDIS, future edition 3 of IEC 60268-7, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60268-7 on 2011-01-02.
This European Standard supersedes EN 60268-7:1996.
EN 60268-7:2011 contains the following changes:
– clause/subclause renumbering in accordance with ISO/IEC Directives, Part 2;
– addition of a measurement system using HATS;
– addition of details on pinna simulators for high measurement reproducibility, see Annex A.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-10-02
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-02
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60268-7:2010 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 60065 NOTE Harmonized as EN 60065.
IEC 60118-0 NOTE Harmonized as EN 60118-0.
IEC 60268 series NOTE Harmonized in EN 60268 series (not modified).
IEC 60268-3 NOTE Harmonized as EN 60268-3.
IEC 60268-4 NOTE Harmonized as EN 60268-4.
IEC 60268-5 NOTE Harmonized as EN 60268-5.
IEC 60318-1 NOTE Harmonized as EN 60318-1.
IEC 60318-2 NOTE Harmonized as EN 60318-2.
IEC 60318-3 NOTE Harmonized as EN 60318-3.
IEC 60318-5 NOTE Harmonized as EN 60318-5.
IEC 61672 series NOTE Harmonized in EN 61672 series (not modified).
IEC 61938 NOTE Harmonized as EN 61938.
ISO 7029:2000 NOTE Harmonized as EN ISO 7029:2000 (not modified).
ISO 18233 NOTE Harmonized as EN ISO 18233.
__________
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SIST EN 60268-7:2011
- 3 - EN 60268-7:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 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 Guide 106 - - -
Guide for specifying environmental conditions
for equipment performance rating
IEC 60038 - IEC standard voltages -
IEC 60050-801 1994 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 801: Acoustics and electroacoustics
IEC 60068-1 - Environmental testing - EN 60068-1 -
Part 1: General and guidance
IEC 60086-1 - Primary batteries - EN 60086-1 -
Part 1: General
IEC 60263 - Scales and sizes for plotting frequency - -
characteristics and polar diagrams
IEC 60268-1 - Sound system equipment - HD 483.1 S2 -
Part 1: General
IEC 60268-2 - Sound system equipment - HD 483.2 S2 -
Part 2: Explanation of general terms and
calculation methods
IEC 60268-11 - Sound system equipment - HD 483.11 S3 -
Part 11: Application of connectors for the
interconnection of sound system components
IEC 60268-12 - Sound system equipment - EN 60268-12 -
Part 12: Application of connectors for
broadcast and similar use
IEC 60711 - Occluded-ear simulator for the measurement HD 443 S1 -
of earphones coupled to the ear by ear inserts
IEC/TR 60959 - Provisional head and torso simulator for - -
acoustic measurements on air conduction
hearing aids
IEC 61672-1 - Electroacoustics - Sound level meters - EN 61672-1 -
Part 1: Specifications
ISO 3741 - Acoustics - Determination of sound power EN ISO 3741 -
levels of noise sources using sound pressure -
Precision methods for reverberation rooms
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SIST EN 60268-7:2011
EN 60268-7:2011 - 4 -
Publication Year Title EN/HD Year
ISO 4869-1 - Acoustics - Hearing protectors - EN 24869-1 -
Part 1: Subjective method for the
measurement of sound attenuation
ISO 4869-3 - Acoustics - Hearing protectors - EN ISO 4869-3 -
Part 3: Measurement of insertion loss of ear-
muff type protectors using an acoustic test
fixture
ISO 7619-1 - Rubber, vulcanized or thermoplastic - - -
Determination of indentation hardness -
Part 1: Durometer method (Shore hardness)
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SIST EN 60268-7:2011
IEC 60268-7
®
Edition 3.0 2010-01
INTERNATIONAL
STANDARD
Sound system equipment –
Part 7: Headphones and earphones
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 33.160.50 ISBN 978-2-88910-084-2
® Registered trademark of the International Electrotechnical Commission
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SIST EN 60268-7:2011
– 2 – 60268-7 © IEC:2010(E)
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 Classification, designation and coding .9
5 Marking of terminals, controls and polarity.13
6 User instructions .13
7 Conditions for specifications and measurements .14
7.1 Rated conditions .14
7.2 Standard conditions for measurement .15
7.3 Couplers and ear simulators.15
7.4 Measurement conditions for simulated programme signal.15
7.5 Loudness comparison conditions.16
7.5.1 General .16
7.5.2 Free-field comparison conditions .16
7.5.3 Diffuse-field comparison conditions .17
7.6 Ear canal sound pressure level measurement conditions.17
8 Characteristics to be specified and their methods of measurement .17
8.1 Power supply.17
8.2 Electrical impedance .17
8.2.1 Rated impedance .17
8.2.2 Impedance/frequency characteristic.18
8.2.3 Rated source impedance .18
8.3 Input voltage .18
8.3.1 Rated source e.m.f. .18
8.3.2 Limiting values of input voltage.18
8.3.3 Characteristic voltage.19
8.3.4 Simulated programme signal characteristic voltage .20
8.3.5 Simulated programme signal characteristic voltage corrected by
A-weighting characteristics and free-field response compensation.20
8.3.6 Protective devices .21
8.4 Input power .21
8.5 Sound pressure (level) .22
8.5.1 General .22
8.5.2 Characteristics to be specified.22
8.5.3 Method of measurement .22
8.6 Frequency response.23
8.6.1 General .23
8.6.2 Coupler or ear simulator (including HATS) frequency response .23
8.6.3 Free-field comparison frequency response .24
8.6.4 Diffuse-field comparison frequency response.25
8.6.5 Free-field and diffuse-field ear canal sound pressure level frequency
responses.25
8.6.6 Rated frequency range .27
8.7 Amplitude non-linearity.27
8.7.1 General .27
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SIST EN 60268-7:2011
60268-7 © IEC:2010(E) – 3 –
8.7.2 Harmonic distortion .27
8.7.3 Modulation distortion .28
8.7.4 Difference-frequency distortion .28
8.8 Rated climatic conditions.29
8.9 External electric and/or magnetic field.29
8.9.1 Characteristics to be specified.29
8.9.2 Method of measurement .29
8.10 Unwanted sound radiation .29
8.10.1 Characteristic to be specified.29
8.10.2 Method of measurement .30
8.11 Sound attenuation .30
8.11.1 Characteristic to be specified.30
8.11.2 Method of measurement .30
8.12 Crosstalk attenuation for multi-channel headphones.30
8.12.1 Characteristic to be specified.30
8.12.2 Method of measurement .30
8.13 Application force .30
8.13.1 Characteristic to be specified.30
8.13.2 Method of measurement .30
8.14 Physical characteristics, cables and connectors .31
8.14.1 Characteristics to be specified.31
9 Classification of characteristics .32
Annex A (normative) Pinna simulators for measurements of headphones and earphones .33
Annex B (normative) Specification and conditions of use of a microphone for use inside
the ear canal.42
Annex C (informative) Practical details of free-field comparison conditions .43
Annex D (informative) Practical details of diffuse-field comparison conditions.44
Annex E (informative) Practical details of the subjective comparison and ear canal
sound pressure level conditions .45
Bibliography.46
Figure 1 – Diagrammatic horizontal sections showing types of earphones and their
spatial relationships with the pinna and/or canal entrance.11
Figure 2 – Diagrams showing the four possible construction: acoustically open or closed,
and closed- or open-back.13
Figure 3 – Illustrated measurement diagram by simulated programme signal .16
Figure A.1 – Shape of the recommended pinna simulator .34
Figure A.2 – Coordinate for the recommended pinna simulator .35
Figure A.3 – Cross-sectional shapes and dimensions of the recommended pinna
simulator, horizontal section .38
Figure A.4 – Cross-sectional shapes and dimensions of the recommended pinna
simulator, vertical section .41
Table 1 – Classification of characteristics .32
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SIST EN 60268-7:2011
– 4 – 60268-7 © IEC:2010(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOUND SYSTEM EQUIPMENT –
Part 7: Headphones and earphones
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 60268-7 has been prepared by IEC technical committee TC 100:
Audio, video and multimedia systems and equipment.
This third edition cancels and replaces the second edition published in 1996, and constitutes a
technical revision. This edition contains the following changes:
• clause/subclause renumbering in accordance with ISO/IEC Directives, Part 2;
• addition of a measurement system using HATS;
• addition of details on pinna simulators for high measurement reproducibility, see Annex A.
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SIST EN 60268-7:2011
60268-7 © IEC:2010(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
100/1621/FDIS 100/1641/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 of IEC 60268 series, published under the general title Sound system equipment,
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site 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.
A bilingual version of this publication may be issued at a later date.
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SIST EN 60268-7:2011
– 6 – 60268-7 © IEC:2010(E)
SOUND SYSTEM EQUIPMENT –
Part 7: Headphones and earphones
1 Scope
This part of IEC 60268, is applicable to headphones, headsets, earphones and earsets,
intended to be used on, or in, the human ear. It also applies to equipment, such as pre-amplifiers,
passive networks and power supplies which form an integral part of the headphone system.
It does not deal with:
a) safety, for which reference should be made to IEC 60065 or another appropriate standard;
b) the characteristics of microphones of headsets, for which reference should be made to
IEC 60268-4;
c) earphones and other devices for hearing aids, for which reference should be made to
IEC 60118-0;
d) headphones for audiometry;
e) headphones and other devices which form part of an active ear-defender system, although
some of its provisions may be applicable.
This standard specifies the characteristics which should be included by the manufacturer in
specifications, and relevant methods of measurement. It includes a classification of the different
types of earphone, mainly characterized by the way in which the transducer is coupled
acoustically to the ear, and a classification code which may also be used for marking.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60038, IEC standard voltages
IEC 60050(801):1994, International Electrotechnical Vocabulary – Chapter 801: Acoustics and
electroacoustics
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60086-1, Primary batteries – Part 1: General
IEC Guide 106, Guide for specifying environmental conditions for equipment performance
rating
IEC 60263, Scales and sizes for plotting frequency characteristics and polar diagrams
IEC 60268-1, Sound system equipment – Part 1: General
IEC 60268-2, Sound system equipment – Part 2: Explanation of general terms and calculation
methods
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SIST EN 60268-7:2011
60268-7 © IEC:2010(E) – 7 –
IEC 60268-11, Sound system equipment – Part 11: Application of connectors for the
interconnection of sound system components
IEC 60268-12, Sound system equipment – Part 12: Application of connectors for broadcast
and similar use
IEC 60711, Occluded-ear simulator for the measurement of earphones coupled to the ear by
1
ear inserts
IEC TR 60959, Provisional head and torso simulator for acoustic measurements on air
2
conduction hearing aids
IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications
ISO 3741, Acoustics – Determination of sound power levels of noise sources using sound
pressure – Precision methods for reverberation rooms
ISO 4869-1, Acoustics – Hearing protectors – Part 1: Subjective method for the measurement
of sound attenuation
ISO 4869-3, Acoustics – Hearing protectors – Part 3: Measurement of insertion loss of
ear-muff type protectors using an acoustic test fixture
ISO 7619-1, Rubber, vulcanized and thermoplastic – Determination of indentation hardness –
Part 1: Durometer method (Shore hardness)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply, see also
IEC 60050-801 (IEV).
NOTE Any device defined in 3.1 to 3.15 and their connector(s) for electrical input should be regarded as part of the
transducer.
3.1
earphone
electroacoustic transducer by which acoustic oscillations are obtained from electric signals and
intended to be closely coupled acoustically to the ear
[IEV 801-27-18]
3.2
headphone
assembly of one or two earphones on a headband or chinband, the use of which may be optional
(e.g. with intra-concha earphones)
3.3
headset
headphones equipped with a microphone
3.4
earset
earphones equipped with a microphone
___________
1
This publication will be replaced by future IEC 60318-4 (to be published).
2
This publication is planned to be replaced by future IEC 60318-7 (under consideration).
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SIST EN 60268-7:2011
– 8 – 60268-7 © IEC:2010(E)
NOTE This definition is included because the term appears in the catalogue of IEC publications.
3.5
insert earphone
small earphone that is attached directly to a connecting element, for example an earmould,
inserted into the ear canal
[IEV 801-27-22, modified]
3.6
intra-concha earphone
small earphone that fits in the concha cavity, with its acoustic exit close to the entrance of the
ear canal
3.7
supra-aural earphone
earphone applied externally to the outer ear and intended to rest on the pinna
[IEV 801-27-23, modified]
3.8
supra-concha earphone
earphone intended to rest on the ridges of the concha cavity
3.9
circumaural earphone
earphone having a cavity large enough to cover the region of the head including the ear
[IEV 801-27-24]
3.10
ear shell
circumaural type of earphone hanging on the ear
3.11
stethoscopic headphone
insert headphone by which the earphone(s) is/are coupled to the ears by means of a pair of
rigid tubes, so that the assembly resembles a stethoscope
3.12
acoustically open earphone
earphone which intentionally provides an acoustic path between the external environment and
the ear canal
3.13
acoustically closed earphone
earphone which is intended to prevent acoustic coupling between the external environment
and the ear canal
3.14
closed-back earphone
earphone which does not emit significant sound radiation from the back of the transducer to
the external environment
3.15
open-back earphone
earphone which emits significant sound radiation from the back of the transducer to the external
environment
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SIST EN 60268-7:2011
60268-7 © IEC:2010(E) – 9 –
3.16
simulated programme signal
signal whose mean power spectral density closely resembles the average of the mean power
spectral densities of a wide range of programme material, in accordance with IEC 60268-1.
NOTE This signal is called as “wide band signal” in a few standards.
4 Classification, designation and coding
The following designations and classification codes shall be used:
60268-7 - IEC - XXXX - NNRN - N
where
60268-7-IEC is the standard form of prefix.
• X (first letter) gives the principle of the transducer:
D - electrodynamic (moving coil);
E - electret (self-polarizing);
F - piezo-electric (polymer);
M - electromagnetic (moving armature or diaphragm);
P - piezo-electric (ceramic);
S - electrostatic (externally polarized).
• X (second letter) gives
...
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