1、INTERNATIONAL STANDARD IEC 61842 First edition 2002-03 Microphones and earphones for speech communications Reference number IEC 61842:2002(E)Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series. For example, IEC 34-1 is now referred to a
2、s IEC 60034-1. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and
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7、y questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00INTERNATIONAL STANDARD IEC 61842 First edition 2002-03 Microphones and earphones for speech communications IEC 2002 Copyrigh
8、t - 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 Varemb, PO Box 131, CH
9、-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch N For price, see current catalogue PRICE CODE Commission Electrotechnique Internationale International Electrotechnical Commission 2 61842 IEC:2002(E) CONTENTS FOREWORD.3 1 Scope.4
10、 2 Normative references .4 3 Terms and definitions .4 3.1 Classification.4 3.2 Devices for measurement6 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 communic
11、ations 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 insulation15 7 Characteristics to be specified15 Annex A (informative) Miniature 4-position connector.25 Annex B (informative
12、) Sub-miniature 2,5 mm concentric connector with three contacts27 Bibliography28 Figure 1 Artificial ear for ordinary earphones .18 Figure 2 Example of the case for microphone unit measurement18 Figure 3 Example of the case for earphone unit measurement .19 Figure 4 Determination of the artificial m
13、outh position from the earcap reference point 20 Figure 5 Calibration system diagram for output sound pressure from artificial mouth20 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 sy
14、stem diagram for earphone sensitivity23 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
15、interface part of jack for miniature 4-position connector26 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
16、 and classification 16 Table 3 Characteristics of earphones for speech communication to be specified and classification 1761842 IEC:2002(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS FOREWORD 1) The IEC (International Electrotechnical Commission
17、) 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 addi
18、tion 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 liaisi
19、ng 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
20、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
21、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 th
22、eir 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 t
23、o 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 h
24、as 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 repor
25、t 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
26、 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 han
27、dsets, 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 b
28、e 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 a
29、ny 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 c
30、alibration 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 c
31、oupled 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 s
32、ets 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 talkers hand61842
33、 IEC:2002(E) 5 3.1.2 headset assembly for speech communications, which consists of a holder to put on the talkers head, one or two earphone parts and a microphone part, so as to keep the talkers hands free 3.1.3 earset assembly for speech communications, which consists of an earphone part and a micr
34、ophone part, so as to keep the talkers hands free, without a holder to put on the talkers 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
35、 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 elemen
36、ts 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“
37、, 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 spee
38、ch 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 spee
39、ch 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 tal
40、kers 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 earphone unit for speech communications electroacoustic transducer installed in a handset, in an earset or in a headset
41、to radiate sound signal in the vicinity of the listeners ear NOTE The earphone unit for speech communications is called merely an “earphone unit“ in Clause 4 of this standard and beyond. 3.1.8 case for unit measurement case in which a microphone unit or an earphone unit for speech communications is
42、installed for measurement. It includes additional acoustic circuit elements so as to obtain practical frequency characteristics, if necessary 6 61842 IEC:2002(E) 3.2 Devices for measurement 3.2.1 mouthpiece holes holes bored into the front of the enclosure of a microphone unit for speech communicati
43、ons, to receive the input sound 3.2.2 earcap holes holes bored into the front of the enclosure of an earphone for speech communications, to radiate the output sound 3.2.3 artificial mouth sound source for microphone measurement, which can produce the sound field similar to that around an ordinary hu
44、man mouth 3.2.4 artificial ear acoustic load for earphone measurement, whose acoustic impedance is similar to that of an ordinary human ear. It includes a microphone for measurement 3.2.5 lip ring circular ring placed in front of the sound outlet of an artificial mouth for localizing the equivalent
45、lip position 3.2.6 lip plane outer plane of the lip ring, giving the reference point for finding the measuring position 3.2.7 external d.c. power supply d.c. power supply for a microphone for speech communications including an amplifier or an electrical impedance converter circuit 3.2.8 additional r
46、esistance electrical resistance for the earphone for speech communications which requires an external resistance for necessary adjustment of characteristics of the device 3.2.9 probe coil coil for measurement of the external magnetic field of an earphone for speech communications 3.3 Characteristics
47、 and performance 3.3.1 sensitivity (V/Pa) absolute value of the ratio between the open-circuit output voltage from a microphone for speech communications placed at a specified point in the sound field produced by the artificial mouth and the sound pressure in the undisturbed free field at a specifie
48、d calibration point, the signal frequency being the reference frequency NOTE Though the specified point for the microphone and the sound pressure calibration point should be identical in general, these points may be different according to this Standard.61842 IEC:2002(E) 7 3.3.2 sensitivity level (dB
49、) twenty times the logarithm to base ten of the sensitivity divided by the reference sensitivity (1 V/Pa) 3.3.3 sensitivity to voltage (Pa/V) absolute value of the ratio between the sound pressure produced by an earphone for speech communications in the artificial ear and the voltage supplied to the earphone, the signal frequency being the reference frequency 3.3.4 sensitivity level to voltage (dB) twenty times the logarithm
