IEC 61842:2002

Microphones and earphones for speech communications

Applies to the microphone part and earphone part of handsets, headsets or earsets for speech communications, and also to the microphone units and earphone units of built-in handsets, headsets or earsets. Establishes definitions relating to these electroacoustic transducers, standardizes the characteristics to be specified and the relevant methods of measurement.

General Information

• Status: Published
• Publication Date: 07-Mar-2002
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.140.50 - Electroacoustics
• ICS: 33.160.50 - Accessories
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: PPUB - Publication issued
• Start Date: 30-Apr-2002
• Completion Date: 08-Mar-2002

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
First edition
2002-03
Microphones and earphones
for speech communications
Reference number
Publication numbering
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60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
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INTERNATIONAL IEC
STANDARD
First edition
2002-03
Microphones and earphones
for speech communications
 IEC 2002  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
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Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61842  IEC:2002(E)
CONTENTS
FOREWORD.3
1 Scope.4
2 Normative references .4
3 Terms and definitions .4
3.1 Classification.4
3.2 Devices for measurement.6
3.3 Characteristics and performance .6
4 Characteristics and measuring procedures .7
4.1 General conditions .7
4.2 Rated conditions .8
4.3 Measuring conditions.9
4.4 Microphones for speech communications .11
4.5 Earphones for speech communications .13
5 Connectors and contact designation .15
5.1 Miniature 4-position connector.15
5.2 Concentric connector.15
6 Endurance of insulation .15
7 Characteristics to be specified.15
Annex A (informative) Miniature 4-position connector.25
Annex B (informative) Sub-miniature 2,5 mm concentric connector with three contacts.27
Bibliography.28
Figure 1 – Artificial ear for ordinary earphones .18
Figure 2 – Example of the case for microphone unit measurement.18
Figure 3 – Example of the case for earphone unit measurement .19
Figure 4 – Determination of the artificial mouth position from the earcap reference point .20
Figure 5 – Calibration system diagram for output sound pressure from artificial mouth.20
Figure 6 – Measuring system diagram for microphone unit sensitivity .21
Figure 7 – Diagram of listening test for normal operation of microphone .22
Figure 8 – Measuring system diagram for earphone sensitivity.23
Figure 9 – Diagram of listening test for normal operation of earphone.24
Figure 10 – Connection designation for plug of miniature 4-position connector .24
Figure A.1 – Shape and basic dimensions of plug for miniature 4-position connector .25
Figure A.2 – Shape of plug interface part of jack for miniature 4-position connector.26
Figure B.1 – 2,5 mm pin concentric connector (plug) with three contacts (tip, ring and
sleeve).27
Table 1 – Definitions of earphone, headphone, earset and headset .16
Table 2 – Characteristics of microphones for speech communication to be specified
and classification .16
Table 3 – Characteristics of earphones for speech communication to be specified
and classification .17

61842  IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61842 has been prepared by IEC technical committee 100: Audio,
video and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/450/FDIS 100/479/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.
The committee has decided that the contents of this publication will remain unchanged until 2005.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 61842  IEC:2002(E)
MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
1 Scope
This standard applies to the microphone part and earphone part of handsets, headsets or
earsets for speech communications, and also to the microphone units and earphone units of
built-in handsets, headsets or earsets. The object of this standard is to establish definitions
relating to these electroacoustic transducers, and to standardize the characteristics to be
specified and the relevant methods of measurement. This does not exclude the use of other
methods of measurement which can be shown to give the same or more reliable results.
2 Normative references
The following reference 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 60268-1:1985, Sound system equipment – Part 1: General
IEC 60268-4, Sound system equipment – Part 4: Microphones
IEC 60268-7, Sound system equipment – Part 7: Headphones and earphones
IEC 60318-1, Electroacoustics – Simulators of human head and ear – Part 1: Ear simulator for
the calibration of supra-aural earphones
IEC 60603-11:1992, Connectors for frequencies below 3 MHz for use with printed boards –
Part 11: Detail specification for concentric connectors (dimensions for free connectors and
fixed connectors)
IEC 60711, Occluded-ear simulator for the measurement of earphones coupled to the ear
by ear inserts
IEC 61094-1, Measurement microphones – Part 1: Specifications for laboratory standard
microphones
IEC 61094-4, Measurement microphones – Part 4: Specifications for working standard
microphones
ITU-T P.51, Artificial mouth
ITU-T P.370, Coupling hearing aids to telephone sets
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1 Classification
3.1.1
handset
assembly for speech communications, which is a handle including a microphone part and an
earphone part suitable to be held by the talker's hand

61842  IEC:2002(E) – 5 –
3.1.2
headset
assembly for speech communications, which consists of a holder to put on the talker's head,
one or two earphone parts and a microphone part, so as to keep the talker’s hands free
3.1.3
earset
assembly for speech communications, which consists of an earphone part and a microphone
part, so as to keep the talker’s hands free, without a holder to put on the talker's head
NOTE The distinction between an earset and a headset is as complicated as it is between an earphone and
a headphone. Table 1 explains the definitions of earphone, headphone, earset and headset used in this standard.
3.1.4
microphone for speech communications:
a) part of a handset, an earset or a headset, which functions as a microphone (an acousto-
electrical transducer)
b) assembly of a microphone unit for speech communications and a case for measurement
purposes, including acoustical circuit elements so as to obtain practical frequency
characteristics
NOTE 1 A microphone for speech communications is understood to include devices, if any, such as amplifiers or
impedance matching transformers up to the output terminals.
NOTE 2 A microphone for speech communications is called merely "microphone", or “microphone part” of a
handset, of an earset or of a headset, in Clause 4 of this standard and beyond.
3.1.5
earphone for speech communications
a) part of a handset, an earset or a headset, which functions as an earphone (an electro-
acoustic transducer)
b) assembly of an earphone unit for speech communications and a case for measurement
purposes, including acoustical circuit elements so as to obtain practical frequency
characteristics
NOTE 1 Any component which is intended by the manufacturer as an integral part of the earphone is included
during measurements.
NOTE 2 An earphone for speech communications is called merely "earphone", or “earphone part” of a handset, of
an earset or of a headset, in Clause 4 of this standard and beyond.
3.1.6
microphone unit for speech communications
acousto-electrical transducer installed in a handset, in an earset or in a headset to pick up the
talker's speech in the vicinity of his/her mouth
NOTE The microphone unit for speech communications is called merely a "microphone unit" in Clause 4 of this
standard and beyond.
3.1.7
earphon
...