SIST EN IEC 60268-4:2019
(Main)Sound system equipment - Part 4: Microphones (IEC 60268-4:2018)
Sound system equipment - Part 4: Microphones (IEC 60268-4:2018)
This part of IEC 60268 specifies methods of measurement for the electrical impedance,
sensitivity, directional response pattern, dynamic range and external influences of sound
system microphones, and also details the characteristics to be specified by the manufacturer.
It applies to sound system microphones for all applications for speech and music. It does not
apply to measurement microphones, but it does apply to each audio channel of microphones
having more than one channel, for example for stereo or similar use. It is also applicable to
flush-mounted microphones and to the analogue characteristics of microphones with digital
audio output.
For the purposes of this International Standard, a microphone includes all such devices as
transformers, pre-amplifiers, or other elements that form an integral part of the microphone,
up to the output terminals specified by the manufacturer.
The major characteristics of a microphone are considered in Clauses 6 to 21. Additional
characteristics are considered in Annex A and Annex C.
NOTE The characteristics specified in this document do not describe the subjective response of the microphone.
Further work is necessary to find new definitions and measurement procedures for a later introduction of objective
characteristics for at least some of the subjective descriptions used to describe microphone performance.
Elektroakustische Geräte - Teil 4: Mikrofone (IEC 60268-4:2018)
Equipements pour systèmes électroacoustiques - Partie 4: Microphones (IEC 60268-4:2018)
NEW!IEC 60268-4:2018 est disponible sous forme de IEC 60268-4:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
Elektroakustične naprave - 4. del: Mikrofoni (IEC 60268-4:2018)
Ta del standarda IEC 60268 določa metode merjenja za električno impedanco, občutljivost, odzivni krmilni vzorec, dinamično območje in zunanje vplive elektroakustičnih mikrofonov ter hkrati določa značilnosti, ki jih opredeli proizvajalec. Uporablja se za elektroakustične mikrofone za vse načine uporabe pri govoru in glasbi. Ne uporablja se za merilne mikrofone, se pa uporablja za vsak avdio kanal mikrofonov, ki imajo več kot en kanal, na primer za stereo oziroma podobno uporabo. Uporablja se tudi za vgrezne vgradne mikrofone in za analogne značilnosti mikrofonov z digitalnim avdio izhodom.
Za namene tega mednarodnega standarda mikrofon vključuje vse take naprave, kot so transformatorji, predojačevalniki ali drugi elementi, ki tvorijo sestavni del mikrofona, do izhodnih terminalov, ki jih določi proizvajalec.
Glavne značilnosti mikrofona so obravnavane v točkah od 6 do 21. Dodatne značilnosti so obravnavane v dodatkih A in C.
OPOMBA: Značilnosti, opredeljene v tem dokumentu, ne opisujejo subjektivnega odziva mikrofona.
Potrebno je dodatno delo za iskanje novih definicij in postopkov merjenja za naknadno uvedbo objektivnih značilnosti za vsaj nekatere subjektivne opise, ki se uporabljajo za opisovanje delovanja mikrofona.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60268-4:2019
01-maj-2019
1DGRPHãþD
SIST EN 60268-4:2014
(OHNWURDNXVWLþQHQDSUDYHGHO 0LNURIRQL ,(&
Sound system equipment - Part 4: Microphones (IEC 60268-4:2018)
Elektroakustische Geräte - Teil 4: Mikrofone (IEC 60268-4:2018)
Equipements pour systèmes électroacoustiques - Partie 4: Microphones (IEC 60268-
4:2018)
Ta slovenski standard je istoveten z: EN IEC 60268-4:2018
ICS:
33.160.50 Pribor Accessories
SIST EN IEC 60268-4:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN IEC 60268-4:2019
---------------------- Page: 2 ----------------------
SIST EN IEC 60268-4:2019
EUROPEAN STANDARD EN IEC 60268-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2018
ICS 33.160.50 Supersedes EN 60268-4:2014
English Version
Sound system equipment - Part 4: Microphones
(IEC 60268-4:2018)
Equipements pour systèmes électroacoustiques - Partie 4: Elektroakustische Geräte - Teil 4: Mikrofone
Microphones (IEC 60268-4:2018)
(IEC 60268-4:2018)
This European Standard was approved by CENELEC on 2018-10-17. 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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60268-4:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60268-4:2019
EN IEC 60268-4:2018 (E)
European foreword
The text of document 100/2992/CDV, future edition 6 of IEC 60268-4, prepared by IEC/TC 100 "Audio,
video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60268-4:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-07-17
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-10-17
document have to be withdrawn
This document supersedes EN 60268-4:2014.
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.
Endorsement notice
The text of the International Standard IEC 60268-4:2018 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:
CISPR 22:2008 NOTE Harmonized as EN 55022:2010 (modified)
IEC 60065:2014 NOTE Harmonized as EN 60065:2014 (modified)
IEC 60958-4:2016 (series) NOTE Harmonized as EN 60958-4:2016 (series)
IEC 61000-3-2:2014 NOTE Harmonized as EN 61000-3-2:2014 (not modified)
IEC 61000-3-3:2013 NOTE Harmonized as EN 61000-3-3:2013 (not modified)
IEC 61606 (series) NOTE Harmonized as EN 61606 (series)
IEC 61672-1:2013 NOTE Harmonized as EN 61672-1:2013 (not modified)
2
---------------------- Page: 4 ----------------------
SIST EN IEC 60268-4:2019
EN IEC 60268-4:2018 (E)
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.cenelec.eu.
Publication Year Title EN/HD Year
CISPR 35 (mod) 2016 Electromagnetic compatibility of multimedia EN 55035 2017
equipment - Immunity requirements
IEC 60268-1 1985 Sound system equipment. Part 1: General HD 483.1 S2 1989
+ A1 1988 - -
+ A2 1988 - -
IEC 60268-2 1987 Sound system equipment. Part 2: Explanation HD 483.2 S2 1993
of general terms and calculation methods
+ A1 1991 - -
IEC 60268-3 2013 Sound system equipment - Part 3: Amplifiers EN 60268-3 2013
IEC 60268-5 2003 Sound system equipment - Part 5: EN 60268-5 2003
Loudspeakers
+ A1 2007 + A1 2009
IEC 60268-11 1987 Sound system equipment. Part 11: Application HD 483.11 S3 1993
of connectors for the interconnection of sound
system components
+ A1 1989 - -
+ A2 1991 - -
IEC 60268-12 1987 Sound system equipment. Part 12: Application EN 60268-12 1995
of connectors for broadcast and similar use
+ A1 1991 - -
+ A2 1994 + A2 1995
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-2 2009
2: Testing and measurement techniques -
Electrostatic discharge immunity test
3
---------------------- Page: 5 ----------------------
SIST EN IEC 60268-4:2019
EN IEC 60268-4:2018 (E)
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-3 2006
3 : Testing and measurement techniques -
Radiated, radio-frequency, electromagnetic
field immunity test
+ A1 2007 + A1 2008
+ A2 2010 + A2 2010
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-4 2012
4: Testing and measurement techniques -
Electrical fast transient/burst immunity test
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-6 2014
6: Testing and measurement techniques -
Immunity to conducted disturbances, induced
by radio-frequency fields
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-8 2010
8: Testing and measurement techniques -
Power frequency magnetic field immunity test
IEC 61000-4-16 2015 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-16 2016
16: Testing and measurement techniques -
Test for immunity to conducted, common
mode disturbances in the frequency range 0
Hz to 150 kHz
IEC 61000-4-17 1999 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-17 1999
17: Testing and measurement techniques -
Ripple on d.c. input power port immunity test
+ A1 2001 + A1 2004
+ A2 2008 + A2 2009
IEC 61260-1 2014 Electroacoustics - Octave-band and fractional- EN 61260-1 2014
octave-band filters - Part 1: Specifications
IEC 61938 2013 Multimedia systems - Guide to the - -
recommended characteristics of analogue
interfaces to achieve interoperability
ITU-T - Artificial mouth - -
Recommendation
P.51
EN 55103-2 2009 Electromagnetic compatibility - Product family EN 55103-2 2009
standard for audio, video, audio-visual and
entertainment lighting control apparatus for
professional use - Part 2: Immunity
EN 300 422-2 2011 Electromagnetic compatibility and radio EN 300 422-2 2011
V1.3.1 spectrum matters (ERM) - Wireless V1.3.1
microphones in the 25 MHz to 3 GHz
frequency range - Part 2: Harmonized EN
covering the essential requirements of article
3.2 of the R&TTE Directive
4
---------------------- Page: 6 ----------------------
SIST EN IEC 60268-4:2019
IEC 60268-4
®
Edition 6.0 2018-09
INTERNATIONAL
STANDARD
Sound system equipment –
Part 4: Microphones
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.50 ISBN 978-2-8322-5955-9
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST EN IEC 60268-4:2019
– 2 – IEC 60268-4:2018 © IEC 2018
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references. 8
3 Terms and definitions . 9
4 General conditions . 10
4.1 General . 10
4.2 Measurement conditions . 10
4.2.1 General . 10
4.2.2 Rated conditions . 11
5 Particular conditions . 12
5.1 Pre-conditioning . 12
5.2 Sound source . 12
5.3 Measurement of sound pressure . 12
5.4 Voltage measuring system . 12
5.5 Acoustical environment . 12
5.5.1 General . 12
5.5.2 Free-field conditions . 13
5.5.3 Diffuse field conditions . 14
5.5.4 Microphone coupled to a sound source by means of a small cavity
coupler . 15
5.6 Methods of measuring frequency response . 15
5.6.1 Point-by-point and continuous sweep frequency methods . 15
5.6.2 Calibration methods . 16
5.7 Overall accuracy . 16
5.8 Graphical presentation of results . 16
6 Type description (acoustical behaviour) . 17
6.1 Principle of the transducer . 17
6.2 Type of microphone . 17
6.3 Type of directional response characteristics . 17
6.4 Application . 17
7 Terminals and controls. 17
7.1 Marking . 17
7.2 Connectors and electrical interface values . 17
8 Reference point and axis . 18
8.1 Reference point . 18
8.2 Reference axis . 18
9 Rated power supply . 18
9.1 Characteristics to be specified . 18
9.2 Method of measurement . 18
10 Electrical impedance . 18
10.1 Internal impedance . 18
10.1.1 Characteristic to be specified . 18
10.1.2 Methods of measurement . 18
10.2 Rated impedance . 19
10.3 Rated minimum permitted load impedance . 19
---------------------- Page: 8 ----------------------
SIST EN IEC 60268-4:2019
IEC 60268-4:2018 © IEC 2018 – 3 –
11 Sensitivity . 19
11.1 General . 19
11.2 Sensitivities with respect to acoustical environment . 20
11.2.1 Free-field sensitivity . 20
11.2.2 Diffuse-field sensitivity . 21
11.2.3 Close-talking and near-field sensitivity . 21
11.2.4 Pressure sensitivity . 22
11.3 Rated sensitivity . 22
12 Response . 22
12.1 Frequency response . 22
12.1.1 Characteristic to be specified . 22
12.1.2 Method of measurement . 23
12.1.3 Graphical presentation of results . 23
12.2 Effective frequency range . 23
12.2.1 Characteristic to be specified . 23
12.2.2 Method of measurement . 23
13 Directional characteristics . 23
13.1 Directional pattern . 23
13.1.1 Characteristic to be specified . 23
13.1.2 Methods of measurement . 24
13.1.3 Graphical presentation of results . 25
13.2 Directivity index . 25
13.2.1 Characteristic to be specified . 25
13.2.2 Method of measurement . 25
14 Amplitude non-linearity . 25
14.1 General . 25
14.2 Total harmonic distortion . 25
14.2.1 Characteristic to be specified . 25
14.2.2 Method of measurement . 26
th
14.3 Harmonic distortion of the n order (n = 2, 3,.) . 26
14.3.1 Characteristic to be specified . 26
14.3.2 Method of measurement . 26
14.4 Difference frequency distortion of second order . 27
14.4.1 Characteristic to be specified . 27
14.4.2 Method of measurement . 27
15 Limiting characteristics . 28
15.1 Rated maximum permissible peak sound pressure . 28
15.2 Overload sound pressure . 28
15.2.1 Characteristic to be specified . 28
15.2.2 Method of measurement . 28
16 Balance . 28
16.1 Balance of the microphone output . 28
16.2 Balance under working conditions . 29
17 Equivalent sound pressure level due to inherent noise . 29
17.1 Characteristic to be specified . 29
17.2 Method of measurement . 29
18 Ambient conditions . 30
18.1 General . 30
---------------------- Page: 9 ----------------------
SIST EN IEC 60268-4:2019
– 4 – IEC 60268-4:2018 © IEC 2018
18.2 Pressure range . 30
18.3 Temperature range . 30
18.4 Relative humidity range . 30
19 External influences . 30
19.1 General . 30
19.1.1 Specification and methods of measurement . 30
19.1.2 Other external interferences . 31
19.2 Equivalent sound pressure due to mechanical vibration . 31
19.2.1 Characteristic to be specified . 31
19.2.2 Method of measurement . 31
19.3 Equivalent sound pressure due to wind . 31
19.3.1 Characteristic to be specified . 31
19.3.2 Method of measurement . 32
19.4 Transient equivalent sound pressure due to "pop" effect . 35
19.4.1 General . 35
19.4.2 Characteristic to be specified . 35
19.4.3 Method of measurement . 36
20 Electromagnetic compatibility (EMC) . 37
20.1 Regulatory requirements . 37
20.2 Requirements for preserving programme quality . 37
20.3 Performance criteria . 38
20.3.1 Criterion A . 38
20.3.2 Criterion B . 38
20.4 Testing for immunity to disturbances in the presence of acoustical noise . 39
20.5 Immunity to frequency-modulated radiated disturbances . 39
20.6 Immunity to magnetic fields . 39
20.7 Immunity to ripple on d.c. power supply . 39
20.8 Permanent magnetic field . 40
20.9 Evaluation and reporting of the test results . 40
21 Physical characteristics . 40
21.1 Dimensions . 40
21.2 Weight . 40
21.3 Cables and connectors . 40
22 Classification of the characteristics to be specified . 40
Annex A (normative) Additional characteristics . 43
A.1 Characteristic sensitivity for speech . 43
A.1.1 Characteristic to be specified . 43
A.1.2 Method of measurement . 43
A.2 Front-to-rear sensitivity index (0° – 180°) . 44
A.2.1 Characteristic to be specified . 44
A.2.2 Method of measurement . 44
A.3 Noise-cancelling index . 44
A.3.1 Characteristic to be specified . 44
A.3.2 Method of measurement . 44
A.4 Special characteristics for stereo microphones . 45
A.4.1 General . 45
A.4.2 Included angle of an XY (left-right) microphone . 45
A.4.3 Acceptance angle . 45
---------------------- Page: 10 ----------------------
SIST EN IEC 60268-4:2019
IEC 60268-4:2018 © IEC 2018 – 5 –
Annex B (informative) Sound insulation device . 46
Annex C (informative) Recommendations for professional digital microphones . 47
C.1 General . 47
C.2 Data sheets for digital microphones . 47
Annex D (informative) Recommended method for measuring noise levels according to
ITU-R BS.468-4 in the digital domain . 50
D.1 General . 50
D.2 Recommended method . 50
D.3 Matlab code . 51
Bibliography . 54
Figure 1 – Balance of the output . 28
Figure 2 – Balance under working conditions . 29
Figure 3 – Measurement set-up for wind influence . 32
Figure 4 – Wind generators, type 1 (Figure 4a) and type 2 (Figure 4b) . 34
Figure 5 – Electrical and mechanical setup for the measuring of the "pop" effect . 36
Figure B.1 – Sound insulation device . 46
Figure D.1 – ITU weighting filter for weighted and unweighted measurements . 50
Figure D.2 – Peak value rectifier scheme . 51
Table 1 – Reverberation time of the empty room . 15
Table 2 – Examples of EMC regulations and standards . 37
Table 3 – Basic EMC standards and their application to microphones . 38
Table 4 – Classification of characteristics . 41
Table A.1 – Speech power weighting factor at octave-band centre frequencies . 43
Table C.1 – Classification of the characteristics recommended to be specified . 47
Table C.2 – Additional digital characteristics to be specified . 49
Table D.1 – Time constants for the two PVRs . 51
---------------------- Page: 11 ----------------------
SIST EN IEC 60268-4:2019
– 6 – IEC 60268-4:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOUND SYSTEM EQUIPMENT –
Part 4: Microphones
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 a
...
SLOVENSKI STANDARD
oSIST prEN 60268-4:2018
01-april-2018
(OHNWURDNXVWLþQHQDSUDYHGHO 0LNURIRQL
Sound system equipment - Part 4: Microphones
Elektroakustische Geräte - Teil 4: Mikrofone
Equipements pour systèmes électroacoustiques - Partie 4: Microphones
Ta slovenski standard je istoveten z: prEN 60268-4:2017
ICS:
33.160.50 Pribor Accessories
oSIST prEN 60268-4:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 60268-4:2018
---------------------- Page: 2 ----------------------
oSIST prEN 60268-4:2018
100/2992/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60268-4 ED6
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2017-11-24 2018-02-16
SUPERSEDES DOCUMENTS:
100/2925/CD,100/2974/CC
IEC TC 100 : AUDIO, VIDEO AND MULTIMEDIA SYSTEMS AND EQUIPMENT
SECRETARIAT: SECRETARY:
Japan Mr Junichi Yoshio
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
TITLE:
Sound system equipment - Part 4: Microphones
NOTE FROM TC/SC OFFICERS:
Copyright © 2017 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
---------------------- Page: 3 ----------------------
oSIST prEN 60268-4:2018
– 2 – IEC CDV 60268-4:2017 © IEC 2017
1 CONTENTS
2
3 CONTENTS . 2
4 FOREWORD . 6
5 1 Scope . 8
6 2 Normative references . 8
7 3 Terms and definitions . 9
8 3.1 far-field microphone . 10
9 3.2 near-field microphone . 10
10 3.3 close-talking microphone . 10
11 4 General conditions . 10
12 4.1 General . 10
13 4.2 Measurement conditions . 10
14 4.2.1 General . 10
15 4.2.2 Rated conditions . 11
16 5 Particular conditions . 12
17 5.1 Pre-conditioning . 12
18 5.2 Sound source . 12
19 5.3 Measurement of sound pressure . 12
20 5.4 Voltage measuring system . 12
21 5.5 Acoustical environment . 12
22 5.5.1 General . 12
23 5.5.2 Free-field conditions . 13
24 5.5.3 Diffuse field conditions . 14
25 5.5.4 Microphone coupled to a sound source by means of a small cavity
26 coupler . 15
27 5.6 Methods of measuring frequency response . 15
28 5.6.1 Point-by-point and continuous sweep frequency methods . 15
29 5.6.2 Calibration methods . 16
30 5.7 Overall accuracy . 16
31 5.8 Graphical presentation of results . 16
32 6 Type description (acoustical behaviour) . 17
33 6.1 Principle of the transducer . 17
34 6.2 Type of microphone . 17
35 6.3 Type of directional response characteristics . 17
36 6.4 Application . 17
37 7 Terminals and controls . 17
38 7.1 Marking . 17
39 7.2 Connectors and electrical interface values . 17
40 8 Reference point and axis . 18
41 8.1 Reference point . 18
42 8.2 Reference axis . 18
43 9 Rated power supply . 18
44 9.1 Characteristics to be specified . 18
45 9.2 Method of measurement . 18
46 10 Electrical impedance . 18
47 10.1 Internal impedance . 18
---------------------- Page: 4 ----------------------
oSIST prEN 60268-4:2018
IEC CDV 60268-4:2014 © IEC 2014 – 3 –
48 10.1.1 Characteristic to be specified . 18
49 10.1.2 Methods of measurement . 18
50 10.2 Rated impedance . 19
51 10.3 Rated minimum permitted load impedance . 19
52 11 Sensitivity . 19
53 11.1 General . 19
54 11.2 Sensitivities with respect to acoustical environment . 20
55 11.2.1 Free-field sensitivity . 20
56 11.2.2 Diffuse-field sensitivity . 21
57 11.2.3 Close-talking and near-field sensitivity . 21
58 11.2.4 Pressure sensitivity . 22
59 11.3 Rated sensitivity . 22
60 12 Response . 22
61 12.1 Frequency response . 22
62 12.1.1 Characteristic to be specified . 22
63 12.1.2 Method of measurement . 23
64 12.1.3 Graphical presentation of results . 23
65 12.2 Effective frequency range . 23
66 12.2.1 Characteristic to be specified . 23
67 12.2.2 Method of measurement . 23
68 13 Directional characteristics . 23
69 13.1 Directional pattern . 23
70 13.1.1 Characteristic to be specified . 23
71 13.1.2 Methods of measurement . 23
72 13.1.3 Graphical presentation of results . 25
73 13.2 Directivity index . 25
74 13.2.1 Characteristic to be specified . 25
75 13.2.2 Method of measurement . 25
76 14 Amplitude non-linearity . 25
77 14.1 General . 25
78 14.2 Total harmonic distortion . 25
79 14.2.1 Characteristic to be specified . 25
80 14.2.2 Method of measurement . 25
th
81 14.3 Harmonic distortion of the n order (n = 2, 3,.) . 26
82 14.3.1 Characteristic to be specified . 26
83 14.3.2 Method of measurement . 26
84 14.4 Difference frequency distortion of second order . 27
85 14.4.1 Characteristic to be specified . 27
86 14.4.2 Method of measurement . 27
87 15 Limiting characteristics . 28
88 15.1 Rated maximum permissible peak sound pressure . 28
89 15.2 Overload sound pressure . 28
90 15.2.1 Characteristic to be specified . 28
91 15.2.2 Method of measurement . 28
92 16 Balance . 28
93 16.1 Balance of the microphone output . 28
94 16.2 Balance under working conditions . 29
95 17 Equivalent sound pressure level due to inherent noise . 29
---------------------- Page: 5 ----------------------
oSIST prEN 60268-4:2018
– 4 – IEC CDV 60268-4:2017 © IEC 2017
96 17.1 Characteristic to be specified . 29
97 17.2 Method of measurement . 29
98 18 Ambient conditions . 30
99 18.1 General . 30
100 18.2 Pressure range . 30
101 18.3 Temperature range . 30
102 18.4 Relative humidity range . 30
103 19 External influences . 30
104 19.1 General . 30
105 19.1.1 Specification and methods of measurement . 30
106 19.1.2 Other external interferences . 31
107 19.2 Equivalent sound pressure due to mechanical vibration . 31
108 19.2.1 Characteristic to be specified . 31
109 19.2.2 Method of measurement . 31
110 19.3 Equivalent sound pressure due to wind . 31
111 19.3.1 Characteristic to be specified . 31
112 19.3.2 Method of measurement . 32
113 19.4 Transient equivalent sound pressure due to "pop" effect . 35
114 19.4.1 Characteristic to be specified . 35
115 19.4.2 Method of measurement . 36
116 20 Electromagnetic compatibility (EMC) . 37
117 20.1 Regulatory requirements . 37
118 20.2 Requirements for preserving programme quality . 37
119 20.3 Performance criteria . 38
120 20.3.1 Criterion A . 38
121 20.3.2 Criterion B . 38
122 20.4 Testing for immunity to disturbances in the presence of acoustical noise . 38
123 20.5 Immunity to frequency-modulated radiated disturbances . 39
124 20.6 Immunity to magnetic fields . 39
125 20.7 Immunity to ripple on d.c. power supply . 39
126 20.8 Permanent magnetic field . 39
127 20.9 Evaluation and reporting of the test results . 39
128 21 Physical characteristics . 40
129 21.1 Dimensions . 40
130 21.2 Weight . 40
131 21.3 Cables and connectors . 40
132 22 Classification of the characteristics to be specified . 40
133 Annex A (normative) Additional characteristics . 43
134 A.1 Characteristic sensitivity for speech . 43
135 A.1.1 Characteristic to be specified . 43
136 A.1.2 Method of measurement . 43
137 A.2 Front-to-rear sensitivity index (0° – 180°) . 44
138 A.2.1 Characteristic to be specified . 44
139 A.2.2 Method of measurement . 44
140 A.3 Noise-cancelling index . 44
141 A.3.1 Characteristic to be specified . 44
142 A.3.2 Method of measurement . 44
143 A.4 Special characteristics for stereo microphones . 45
---------------------- Page: 6 ----------------------
oSIST prEN 60268-4:2018
IEC CDV 60268-4:2014 © IEC 2014 – 5 –
144 A.4.1 General . 45
145 A.4.2 Included angle of an XY (left-right) microphone . 45
146 A.4.3 Acceptance angle . 45
147 Annex B (informative) Sound insulation device . 46
148 Annex C (informative) Recommendations for professional digital microphones . 47
149 C.1 General . 47
150 C.2 Data sheets for digital microphones . 47
151 Annex D (informative) Recommended Method For Measuring Noise Levels According
152 To ITU-R BS.468-4 In The Digital Domain . 50
153 D.1 Scope . 50
154 D.2 Recommended Method . 50
155 D.3 Matlab code . 51
156 Bibliography . 54
157
158 Figure 1 – Balance of the output . 28
159 Figure 2 – Balance under working conditions . 29
160 Figure 3 – Measurement set-up for wind influence . 32
161 Figure 4 – Wind generators, type 1 (Figure 4a) and type 2 (Figure 4b) . 34
162 Figure 5 – Electrical and mechanical set-up for the measuring of the "pop" effect . 36
163 Figure B.1 – Sound insulation device . 46
164
165 Table 1 – Reverberation time of the empty room . 15
166 Table 2 – Examples of EMC regulations and standards . 37
167 Table 3 – Basic EMC standards and their application to microphones . 37
168 Table 4 – Classification of characteristics . 41
169 Table A.1 – Speech power weighting factor at octave-band centre frequencies . 43
170 Table C.1 – Classification of the characteristics recommended to be specified . 47
171 Table C.2 – Additional digital characteristics to be specified . 49
172
173
---------------------- Page: 7 ----------------------
oSIST prEN 60268-4:2018
– 6 – IEC CDV 60268-4:2017 © IEC 2017
174 INTERNATIONAL ELECTROTECHNICAL COMMISSION
175 ____________
176
177 SOUND SYSTEM EQUIPMENT –
178
179 Part 4: Microphones
180
181 FOREWORD
182 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
183 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
184 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
185 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
186 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
187 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
188 in the subject dealt with may participate in this preparatory work. International, governmental and non-
189 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
190 with the International Organization for Standardization (ISO) in accordance with conditions determined by
191 agreement between the two organizations.
192 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
193 consensus of opinion on the relevant subjects since each technical committee has representation from all
194 interested IEC National Committees.
195 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
196 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
197 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
198 misinterpretation by any end user.
199 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
200 transparently to the maximum extent possible in their national and regional publications. Any divergence
201 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
202 the latter.
203 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
204 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
205 services carried out by independent certification bodies.
206 6) All users should ensure that they have the latest edition of this publication.
207 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
208 members of its technical committees and IEC National Committees for any personal injury, property damage or
209 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
210 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
211 Publications.
212 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
213 indispensable for the correct application of this publication.
214 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
215 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
216 International Standard IEC 60268-4 has been prepared by IEC technical committee 100:
217 Audio, video and multimedia systems and equipment.
218 This sixth edition cancels and replaces the fifth edition published in 2014, and constitutes a
219 technical revision.
220 This edition includes the following significant technical changes with respect to the previous
221 edition:
222 – Pop measurement replaced by former Annex
223 – new Annex D for noise measurements in digital domain
224 The text of this standard is based on the following documents:
CDV Report on voting
---------------------- Page: 8 ----------------------
oSIST prEN 60268-4:2018
IEC CDV 60268-4:2014 © IEC 2014 – 7 –
225
226 Full information on the voting for the approval of this standard can be found in the report on
227 voting indicated in the above table.
228 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
229 A list of all parts of the IEC 60268 series, under the general title Sound system equipment,
230 can be found on the IEC website.
231 The committee has decided that the contents of this publication will remain unchanged until
232 the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
233 related to the specific publication. At this date, the publication will be
234 • reconfirmed,
235 • withdrawn,
236 • replaced by a revised edition, or
237 • amended.
238
239
240
---------------------- Page: 9 ----------------------
oSIST prEN 60268-4:2018
– 8 – IEC CDV 60268-4:2017 © IEC 2017
241 SOUND SYSTEM EQUIPMENT –
242
243 Part 4: Microphones
244
245
246
247 1 Scope
248 This part of IEC 60268 specifies methods of measurement for the electrical impedance,
249 sensitivity, directional response pattern, dynamic range and external influences of sound
250 system microphones, and also details the characteristics to be specified by the manufacturer.
251 It applies to sound system microphones for all applications for speech and music. It does not
252 apply to measurement microphones, but it does apply to each audio channel of microphones
253 having more than one channel, for example for stereo or similar use. It is also applicable to
254 flush-mounted microphones and to the analogue characteristics of microphones with digital
255 audio output.
256 For the purposes of this International Standard, a microphone includes all such devices as
257 transformers, pre-amplifiers, or other elements that form an integral part of the microphone,
258 up to the output terminals specified by the manufacturer.
259 The major characteristics of a microphone are considered in Clauses 6 to 21. Additional
260 characteristics are considered in Annex A and Annex C.
261 NOTE The characteristics specified in this standard do not describe the subjective response of the microphone.
262 Further work is necessary to find new definitions and measurement procedures for a later introduction of objective
263 characteristics for at least some of the subjective de
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.