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
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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
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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.
