1、Electroacoustics - Hearing aidsPart 4: Induction-loop systems for hearing aid purposes - System performance requirementsBS EN IEC 60118-4:2015+A1:2018BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN
2、 IEC 60118-4:2015+A1:2018. It is identical to IEC 60118-4:2014, incorporating amendment A1:2017. It supersedes BS EN 60118-4:2015, which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the number
3、 of the IEC amendment. For example, text altered by IEC amendment A1 is indicated by .The UK participation in its preparation was entrusted to Technical Committee EPL/29, Electroacoustics.A list of organizations represented on this committee can be obtained on request to its secretary.This publicati
4、on does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 97036 8ICS 17.140.50Compliance with a British Standard cannot confer immunity fro
5、m legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2015.Amendments/corrigenda issued since publicationDate Text affected30 April 2018 Implementation of IEC amendment 1:2017 with CENELEC endorsement A1:2018BRITISH
6、STANDARDBS EN IEC 60118-4:2015+A1:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN IEC 60118-4:2015 +A1February 2018ICS 17.140.50 Supersedes EN 60118-4:2006CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CENELEC Ref. No. EN IEC 60118-4:2015+A1:2018: EAll rights of exploita
7、tion in any form and by any means reserved worldwide for CENELEC Members.Electroacoustics Hearing aids Part 4: Induction-loop systems for hearing aid purposes System performance requirementslectroacoustique Appareils de correction auditive Partie 4: Systmes de boucles dinduction utilises des fins de
8、 correction auditive Exigences de performances systmeAkustik Hrgerte Teil 4: Induktionsschleifen fr Hrgerte LeistungsanforderungenThis European Standard was approved by CENELEC on 2015-01-15. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions
9、 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
10、 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 e
11、lectrotechnical 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,
12、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.English VersionEN IEC 60118-4:2015+A1:2018 (E)European forewordThe text of document 29/855/FDIS, future edition 3 of IEC 60118-4, prepared by IEC TC 29, Electroacoustics, was submitted to the IEC-CENELEC parallel
13、 vote and was approved by CENELEC as EN 60118-4:2015.The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 2015-10-15 latest date by which the national standards conflicting wit
14、h the document have to be withdrawn(dow) 2018-01-15This document supersedes EN 60118-4:2006.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent ri
15、ghts.Endorsement noticeThe text of the International Standard IEC 60118-4:2014 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 61938 NOTE Harmonized as EN 61938.IEC
16、 61260-1 NOTE Harmonized as EN 61260-1.Foreword to amendment A1The text of document 29/952/CDV, future edition 1 of IEC 60118-4:2014/A1:2017, prepared by IEC/TC 29 “Electroacoustics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 60118-4:2015/A1:2018.The following d
17、ates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 2018-09-14 latest date by which the national standards conflicting with the document have to be withdrawn(dow) 2020-12-14Attention is draw
18、n 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 noticeThe text of the International Standard IEC 60118-4:2014/A1:2017 was approved by CENELEC as a Euro
19、pean Standard without any modification.2BS EN IEC 60118-4:2015+A1:2018EN IEC 60118-4:2015+A1:2018 (E)Annex ZA (normative) Normative references to international publications with their corresponding European publicationsThe following documents, in whole or in part, are normatively referenced in this
20、document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.NOTE 1 When an International Publication has been modified by common modifications, indic
21、ated 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 YearIEC 60268-3 2013 Sound system equipment -Part 3: AmplifiersEN 60268-3 2013IEC 60268-10 1991
22、 Sound system equipment -Part 10: Peak programme level metersHD 483.10 S1 1993IEC 61672-1 2013 Electroacoustics - Sound level meters -Part 1: SpecificationsEN 61672-1IEC 62489-1 Electroacoustics - Audio frequency induction loop systems for assisted hearing -Part 1: Methods of measuring and specifyin
23、 the per-formance of system componentsEN 62489-1 20103BS EN IEC 60118-4:2015+A1:2018FOREWORD . 6INTRODUCTION 81 Scope . 12 Normative references 13 Terms and definitions . 14 General 24.1 Procedure for setting up and commissioning an audio-frequency induction loop system 24.2 Suitability of the site
24、for the installation of an audio-frequency induction-loop system 34.3 Relation of the magnetic field strength level at the telecoil to the sound pressure level at the microphone. 35 Using components of a sound system in an induction-loop system 35.1 General . 35.2 Microphones . 35.3 Mixer 35.4 Power
25、 amplifier 36 Meters and test signals . 46.1 Meters . 46.1.1 Meters in general . 46.1.2 Requirements common to both types . 46.1.3 True-r.m.s. meter 46.1.4 Peak programme meter (PPM) 46.2 Test signals in general . 46.3 Speech signals 56.3.1 Live speech signals . 56.3.2 Recorded speech material . 56.
26、3.3 Simulated speech material 56.4 Pink noise signal 66.5 Sinusoidal signal 66.6 Combi signal 67 Magnetic background noise level of the installation site . 77.1 Method of measurement 77.2 Recommended maximum magnetic noise levels 78 Characteristics to be specified, methods of measurement and require
27、ments 88.1 General . 88.2 Magnetic field strength 88.2.1 Characteristic to be specified 88.2.2 Method of measurement with a simulated speech signal 98.2.3 Method of measurement with pink noise 98.2.4 Method of measurement with a sinusoidal signal 98.2.5 Method of measurement with a combi signal. 98.
28、2.6 Method of measurement Other . 98.2.7 Requirements . 98.3 Frequency response of the magnetic field . 108.3.1 Characteristic to be specified . 108.3.2 Method of measurement with a simulated speech signal .108.3.3 Method of measurement with pink noise .108.3.4 Method of measurement with a sinusoida
29、l signal .118.3.5 Method of measurement with combi signal 118.3.6 Method of measurement Other 11IEC 60118-4:2014+A1:20174 ISO 2018 All rights reservedContents PageBS EN IEC 60118-4:2015+A1:20188.3.7 Requirements 118.4 Useful magnetic field volume 118.4.1 Characteristic to be specified . 118.4.2 Meth
30、ods of measurement . 128.4.3 Requirements 129 Small-volume systems129.1 Definition of measurement points . 129.2 Disabled refuge and similar call-points 129.3 Counter systems 139.4 Useful magnetic field volume method . 159.5 Requirements 1510 Setting up (commissioning) the system 1610.1 Procedure .1
31、610.2 Requirements 1610.3 Amplifier overload at the upper bound of maximum power bandwidth 1610.3.1 Explanation 1610.3.2 Methods of test .1710.3.3 Requirements 1710.4 Magnetic noise level due to the system 1810.4.1 Explanation of term 1810.4.2 Method of measurement with a speech signal 1810.4.3 Meth
32、od of measurement with pink noise .1810.4.4 Method of measurement with a sinusoidal signal .1810.4.5 Method of measurement with a combi signal1810.4.6 Method of measurement Other (no input signal) 1810.4.7 Requirements 18Annex A (informative) Systems for small useful magnetic field volumes .19Annex
33、B (informative) Measuring equipment .22Annex C (informative) Provision of information .25Annex D (informative) Measuring speech signals .27Annex E (informative) Basic theory and practice of audio-frequency induction-loop systems.28Annex F (informative) Effects of metal in the building structure on t
34、he magnetic field .37Annex G (informative) Calibration of field-strength meters .39Annex H (informative) Effect of the aspect ratio of the loop on the magnetic field strength 41Annex I (informative) Overspill of magnetic field from an induction-loop system 44Bibliography .46IEC 60118-4:2014+A1:2017
35、ISO/CIE 2018 All rights reserved 5BS EN IEC 60118-4:2015+A1:2018EN IEC 60118-4:2015+A1:2018 (E)FOREWORD1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of I
36、EC 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
37、) 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
38、 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 nea
39、rly 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 tha
40、t 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 Committee
41、s 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 a
42、ny 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 e
43、dition 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
44、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 indisp
45、ensable 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 60118-4
46、 has been prepared by IEC technical committee 29: Electroacoustics.This third edition constitutes a technical revision.This edition includes the following significant technical changes with respect to the previous edition: Addition of Annexes G, H and I where more information is provided about pract
47、ical considerations and methods of measurement.This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.A list of all parts of the IEC 60118 series, published under the general title Electroacoustics Hearing aids, can be found on the IEC website.6BS EN IEC 60118-4:2015+A1:
48、2018EN IEC 60118-4:2015+A1:2018 (E)The committee has decided that the contents of the base publication and its amendment will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publi
49、cation will be reconfirmed, withdrawn, replaced by a revised edition, or amended.7BS EN IEC 60118-4:2015+A1:2018EN IEC 60118-4:2015+A1:2018 (E)INTRODUCTIONAudio-frequency induction-loop systems are widely used to provide a means for hearing aid users, whose hearing aids are fitted with induction pick-up coils, generally known as telecoils, to minimise the problems of listening when at a distance from a source of sound, shielded from the person speaking by a protective window, and/or in a background noise. Backg
