AS 60118.9-2007 Hearing aids Part 9 Methods of measurement of characteristics of hearing aids with bone vibrator output.pdf.pdf
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1、 AS 60118.92007 IEC 60118-9 Ed. 1.0 (1985) Australian Standard Hearing aids Part 9: Methods of measurement of characteristics of hearing aids with bone vibrator output AS 60118.92007 This Australian Standard was prepared by Committee AV-003, AcousticsHuman Effects. It was approved on behalf of the C
2、ouncil of Standards Australia on 3 November 2006. This Standard was published on 20 February 2007. The following are represented on Committee AV-003: Association of Accredited Certification Bodies Association of Australian Acoustical Consultants Association of Consulting Engineers Australia Audiolog
3、ical Society of Australia Australasian Faculty of Occupational Medicine Australian Acoustical Society Australian Chamber of Commerce and Industry Australian Council of Trade Unions Australian Industry Group Department of Consumer & Employment Protection, WorkSafe Division, WA Department of Labour, N
4、Z National Acoustic Laboratories New South Wales Nurses, Association New Zealand Audiological Society Royal Institute of Naval Architects Safety Institute of Australia The Australian Society of Otolaryngological Head and Neck Surgery Victorian WorkCover Authority WorkCover New South Wales This Stand
5、ard was issued in draft form for comment as DR 06474. Standards Australia wishes to acknowledge the participation of the expert individuals that contributed to the development of this Standard through their representation on the Committee and through public comment period. Keeping Standards upKeepin
6、g Standards upKeeping Standards upKeeping Standards up- - - -totototo- - - -datedatedatedate Australian Standards are living documents that reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Betwee
7、n editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments that may have been published since the Standard was published. Detailed information about Australian Standards,
8、 drafts, amendments and new projects can be found by visiting www.standards.org.auwww.standards.org.auwww.standards.org.auwww.standards.org.au Standards Australia welcomes suggestions for improvements, and encourages readers to notify us immediately of any apparent inaccuracies or ambiguities. Conta
9、ct us via email at mailstandards.org.aumailstandards.org.aumailstandards.org.aumailstandards.org.au, or write to Standards Australia, GPO Box 476, Sydney, NSW 2001. AS 60118.92007 Australian Standard Hearing aids Part 9: Methods of measurement of characteristics of hearing aids with bone vibrator ou
10、tput First published as AS 60118.92007. COPYRIGHT Standards Australia All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Published by Standards Austr
11、alia GPO Box 476, Sydney, NSW 2001, Australia ISBN 0 7337 8038 5 ii PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee AV-003, AcousticsHuman Effects. After consultation with stakeholders in both countries, Standards Australia and Standards New Zealan
12、d decided to develop this Standard as an Australian Standard rather than an Australian/New Zealand Standard. The objective of this Standard is to specify methods of measurement of the characteristics of hearing aids using bone vibrator output. This Standard is identical with IEC 60118-9 Ed. 1.0 (198
13、5), Hearing aids - Part 9: Methods of measurement of characteristics of hearing aids with bone vibrator output. As this Standard is reproduced from an International Standard its number does not appear on each page of text and its identity is shown only on the cover and title page. iii CONTENTS Page
14、1 Scope 1 2 Object 1 3 General 1 4 Explanation of terms 2 5 Test equipment 3 5.1 Equipment for the measurement of the output force level 3 5.2 Equipment for automatic sweep frequency recording. 4 6 Test conditions. 4 6.1 General. 4 6.2 Test space 4 6.3 Locating the hearing aid in the sound field 4 6
15、.4 Applying the bone vibrator to the mechanical coupler 5 7 Measurements . 5 7.1 Output force level frequency response curve for an input SPL of 90 dB (OFL90) curve). 5 7.2 Full-on force level frequency response 5 7.3 Basic force level frequency response 6 7.4 Effect of tone control position on the
16、basic force level frequency response . 6 7.5 Battery current 6 7.6 Non-linear distortion 7 7.7 Internal noise from the hearing aid 7 7.8 Characteristics of hearing aids with induction pick-up coil input 7 8 Frequency response recording chart 7 Annex A Examples of test assemblies 8 iv INTRODUCTION IE
17、C 60118-0, Hearing aids Part 0: Measurement of electroacoustical characteristics, gives information on methods of test for air conduction hearing aids. the majority of hearing aids in use are of this type but a small percentage use a bone vibrator instead of an earphone. The use of bone vibrator req
18、uires a different methods of measuring the output from the hearing aid and also makes it impractical to measure amplification directly in terms of acoustic gain. Amplification in t he case of an air conduction hearing aid is expressed as the difference between the output sound pressure level in an a
19、coustic coupler or ear simulator and the input sound pressure level measured in a specified manner. However, with bone conduction hearing aids the input is in terms of sound pressure level but the output will be in terms of mechanical vibration measured as a alternating force of force level. This st
20、andard defines a method of expressing the input/output ratio as a acousto-mechanical sensitivity level measured on a mechanical coupler according to the second edition of IEC 60373, Mechanical coupler for measurements on bone vibrators By means of information provided in this standard the performanc
21、e of hearing aids with bone vibrator outputs which do not form an integral part of the hearing aid for example body worn hearing aids, may be measured in a similar manner to aids with air conduction outputs as described in IEC 60118-0. Where the bone vibrator forms an integral part of the hearing ai
22、d, or where it is attached in some fixed manner to the hearing aid (e.g. a headband type bone conduction hearing aid), performance cannot be measured in the same way as for body-worn aids, due to the large dimensions of the mechanical coupler having to be in contact with the spectacle arm. This stan
23、dard recommends a pressure method of controlling the input sound pressure level, to the hearing aid microphone. The second edition of IEC 60373, describes the means of measuring the output from a bone vibrator. www.standards.org.au Standards Australia 1 STANDARDS AUSTRALIA Australian Standard Hearin
24、g aidsPart 9: Methods of measurement of characteristics of hearing aids with bone vibrator output 1 Scope This standard specifies methods of measurement of the characteristics of hearing aids using bone vibrator output. 2 Object The methods described will produce a suitable basis for the exchange of
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