IEC 62489-1-2010 Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 1 Methods of measuring and specifying the performance of .pdf

1、 IEC 62489-1Edition 1.0 2010-01INTERNATIONAL STANDARD NORME INTERNATIONALEElectroacoustics Audio-frequency induction loop systems for assisted hearing Part 1: Methods of measuring and specifying the performance of system components lectroacoustique Systmes de boucles dinduction audiofrquences pour a

2、mliorer laudition Partie 1: Mthodes de mesure et de spcification des performances des composants de systmes IEC62489-1:2010 colourinsideTHIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be

3、reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about

4、obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que

5、 ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette public

6、ation, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays de rsidence. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global org

7、anization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amen

8、dment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published

9、 www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing

10、 more than 20 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need fur

11、ther assistance, please visit the Customer Service Centre FAQ or contact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des normes internationales pour

12、tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue d

13、es publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Catalogue en-ligne de la CEI vous permet deffectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les publications retires ou remplaces. Just

14、Published CEI: www.iec.ch/online_news/justpub Restez inform sur les nouvelles publications de la CEI. Just Published dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Electropedia: www.electropedia.org Le premier dictionnaire en ligne au monde de t

15、ermes lectroniques et lectriques. Il contient plus de 20 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Clients: www.iec.ch/webstore/custserv/custserv_ent

16、ry-f.htm Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62489-1Edition 1.0 2010-01INTERNATIONAL STANDARD NORME INTERNATIONALEElectro

17、acoustics Audio-frequency induction loop systems for assisted hearing Part 1: Methods of measuring and specifying the performance of system components lectroacoustique Systmes de boucles dinduction audiofrquences pour amliorer laudition Partie 1: Mthodes de mesure et de spcification des performances

18、 des composants de systmes INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE SICS 17.140.50 PRICE CODECODE PRIXISBN 2-8318-1077-8 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale col

19、ourinside 2 62489-1 IEC:2010 CONTENTS FOREWORD.4 1 Scope.6 2 Normative references .6 3 Terms and definitions .7 4 Rated values 7 5 Amplifiers .7 5.1 General .7 5.2 Rated conditions and standard measuring conditions 7 5.2.1 Rated conditions7 5.2.2 Standard measurement conditions.8 5.3 Pre-conditionin

20、g 8 5.4 Characteristics to be specified, methods of measurement and presentation of results .8 5.4.1 Rated source impedance .9 5.4.2 Rated source e.m.f. .9 5.4.3 Rated load.9 5.4.4 Rated temperature-limited output current.9 5.4.5 Rated time for delivery of rated distortion-limited output current 10

21、5.4.6 Rated total harmonic distortion of the output current10 5.4.7 Maximum (distortion-limited) output current .10 5.4.8 Compliance voltage .10 5.4.9 Noise.11 5.4.10 Magnetic field strength 12 5.4.11 Loop dimensions .13 5.4.12 Frequency response 13 5.4.13 Automatic gain control and compression13 5.

22、4.14 Phase error of quadrature networks for phased loop arrays .14 5.4.15 Installation.14 5.4.16 Physical characteristics .14 6 Microphones.14 6.1 General .14 6.2 Characteristics to be specified, methods of measurement and presentation of results .14 7 Other components 15 7.1 General .15 7.2 Charact

23、eristics to be specified, methods of measurement and presentation of results .15 8 Measurement uncertainty .15 Annex A (informative) Automatic gain control and compression .16 Annex B (informative) Loop conductors and some typical impedance values17 Annex C (informative) Microphones .20 Bibliography

24、21 Figure A.1 Typical steady-state output/input characteristics .16 62489-1 IEC:2010 3 Table B.1 Typical loop characteristics18 Table B.2 Cable characteristics19 4 62489-1 IEC:2010 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS AUDIO-FREQUENCY INDUCTION LOOP SYSTEMS FOR ASSISTED HEARIN

25、G Part 1: Methods of measuring and specifying the performance of system components 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 pr

26、omote 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 Guide

27、s (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 al

28、so 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 poss

29、ible, 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. Wh

30、ile 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

31、 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 attestat

32、ion 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 t

33、his 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 i

34、ndirect, 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

35、 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 62489-1 has been p

36、repared by IEC technical committee 29: Electroacoustics. The text of this standard is based on the following documents: CDV Report on voting 29/667/CDV 29/668/RVC 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

37、publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 62489-1 IEC:2010 5 This part is to be used in conjunction with IEC 60118-4:2006, Electroacoustics Hearing aids Part 4: Induction loop systems for hearing aid purposes Magnetic field strength. A list of all the parts in t

38、he IEC 62489 series, under the general title Electroacoustics Audio-frequency induction loop systems for assisted hearing, 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

39、 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. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours whic

40、h are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 62489-1 IEC:2010 ELECTROACOUSTICS AUDIO-FREQUENCY INDUCTION LOOP SYSTEMS FOR ASSISTED HEARING Part 1: Methods of measuring and specifying the performance

41、of system components 1 Scope This part of the IEC 62489 series applies to the components of audio-frequency induction-loop systems for assisted hearing. It may also be applied to such systems used for other purposes, as far as it is applicable. This standard is intended to encourage accurate and uni

42、form presentation of manufacturers specifications, which can be verified by standardized methods of measurement. It is intended for type testing. The components considered are the following: amplifiers; microphones; other components, such as playback equipment. This standard does not deal with safet

43、y, for which IEC 60065 applies. It also does not deal with EMC (Electromagnetic compatibility) and EMF (Electromagnetic fields, in the context of human exposure). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, o

44、nly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60118-4:2006, Electroacoustics Hearing aids Part 4: Induction loop systems for hearing aid purposes Magnetic field strength IEC 60268-1:1985, Sound system equi

45、pment Part 1: General IEC 60268-2, Sound system equipment Part 2: Explanation of general terms and calculation methods IEC 60268-3:2000, Sound system equipment Part 3: Amplifiers IEC 60268-4:2004, Sound system equipment Part 4: Microphones IEC 61938, Audio, video and audiovisual systems Interconnect

46、ions and matching values Preferred matching values of analogue signals ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995 ) 62489-1 IEC:2010 7 3 Terms and definitions For the purposes of this document, the following definition appli

47、es. 3.1 useful magnetic field volume volume within which the system provides hearing-aid users with a signal of acceptable quality (see 6.7 of IEC 60118-4:2006) 4 Rated values The term “rated” means the value stated by the manufacturer. Rated values are of two kinds; rated conditions, fundamental va

48、lues that can be determined only by the manufacturer, and others that can be measured. See 5.2.1. For a full explanation, see IEC 60268-2. 5 Amplifiers 5.1 General In most systems, the amplifier(s) accepts input from microphone(s) and delivers current to the induction loop(s). If there are separate

49、preamplifier or mixer and final amplifier components, the methods described can be used with the interpretation that input signals are applied to the preamplifier or mixer and measurements of output characteristics are made at the output of the final amplifier. The characteristics to be specified are consistent with the lists in Annex C of IEC 60118-4:2006.