欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    BS PD IEC TS 62886-2016 Electroacoustics Hearing aids Method for measuring electroacoustic performance up to 16 kHz《电声学 助听器 16 kHz及以下电声性能的测量方法》.pdf

    • 资源ID:397839       资源大小:3.99MB        全文页数:46页
    • 资源格式: PDF        下载积分:5000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要5000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    BS PD IEC TS 62886-2016 Electroacoustics Hearing aids Method for measuring electroacoustic performance up to 16 kHz《电声学 助听器 16 kHz及以下电声性能的测量方法》.pdf

    1、Electroacoustics Hearing aids Method for measuring electroacoustic performance up to 16 kHz PD IEC/TS 62886:2016 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National foreword This Published Document is the UK implementation of IEC/TS 62886:2016. The UK participa

    2、tion 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 publication does not purport to include all the necessary provisions of a contract. Users are responsible for

    3、 its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 88484 9 ICS 17.140.50 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards

    4、Policy and Strategy Committee on 30 September 2016. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TS 62886:2016 IEC TS 62886 Edition 1.0 2016-08 TECHNICAL SPECIFICATION Electroacoustics Hearing aids Method for measuring electroacoustic performance up to

    5、16 kHz INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.140.50 ISBN 978-2-8322-3620-8 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside PD IEC/TS 62886:2016 2 IEC TS 62886:2016 IEC

    6、 2016 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope 8 2 Normative references. 8 3 Terms, definitions and abbreviated terms . 8 3.1 Terms and definitions 8 3.2 Abbreviated terms . 9 4 Mechanical design of the 0,4 cm 3coupler 9 4.1 General . 9 4.2 Cavity dimensions . 10 4.2.1 Critical dimensions . 10

    7、 4.2.2 Effective coupler volume 10 4.2.3 Diameter of the coupler cavity 11 4.3 Verification procedure of the effective coupler volume 11 4.3.1 General . 11 4.3.2 Test set-up 11 4.3.3 Effective volume of the coupler under test 11 4.4 Measuring microphone 12 4.4.1 General . 12 4.4.2 Preferred micropho

    8、ne . 12 4.4.3 Alternative microphones . 12 4.5 Static pressure equalisation vent . 12 5 Calibration . 12 5.1 Reference environmental conditions 12 5.2 Calibration procedure 13 6 Coupling of receivers and hearing aids to the coupler . 13 6.1 Coupling to a hearing aid receiver by means of tubing . 13

    9、6.2 Coupling to a hearing aid embedded in or connected to an earmould 13 6.3 Coupling to a receiver in the canal (RIC hearing aid) 14 6.4 Coupling to a BTE hearing aid with 2 mm continuous internal diameter tubing . 15 6.5 Coupling to a BTE hearing aid with earmould simulator 16 6.6 Coupling to a BT

    10、E hearing aid with thin tubing . 17 7 Transfer impedance of the 0,4 cm 3coupler 18 8 Comparison of the 0,4 cm 3 , the 2 cm 3coupler and the occluded-ear simulator . 19 8.1 Sound pressure level frequency response curves . 19 8.2 Comparison of the coupler impedance with typical source impedances . 20

    11、8.3 Influence of sound source impedance on measured level difference between the 0,4 cm 3coupler and the 2 cm 3coupler 21 9 Maximum permitted expanded uncertainty for coupler conformance testing . 22 10 Measurements using the 0,4 cm 3coupler . 23 10.1 General . 23 10.2 Test enclosure and test equipm

    12、ent 23 10.3 Extended frequency range for total harmonic distortion measurements . 23 10.4 Presentation of data 24 10.4.1 General . 24 PD IEC/TS 62886:2016IEC TS 62886:2016 IEC 2016 3 10.4.2 Presentation as 0,4 cm 3coupler data . 24 10.4.3 Presentation as normalised to 2 cm 3coupler data 24 10.5 Maxi

    13、mum permitted expanded uncertainty of measurements performed using the 0,4 cm 3coupler . 24 Annex A (informative) Response transforms between the 0,4 cm 3coupler and the occluded-ear simulator . 26 A.1 General . 26 A.2 Simulation model of the human ear and approximation of /2 resonances . 26 A.3 Mea

    14、sured and simulated transform responses of a standard-fitting . 28 A.4 Transform curves for CIC-fitting and deep-insertion-fitting 29 Annex B (informative) Measurement and modelling of the transfer impedance of the 0,4 cm 3coupler . 33 B.1 Measurement procedure 33 B.1.1 Transfer impedance . 33 B.1.2

    15、 Calibration of the volume velocity source at 250 Hz 33 B.1.3 Calibration of the volume velocity source over the frequency range from 100 Hz to 60 kHz . 34 B.1.4 Test set-up for measuring the coupler transfer impedance 34 B.2 Measurement of the coupler transfer impedance 35 B.3 Electrical analogue r

    16、epresentation of the coupler as a tube model 38 Bibliography . 41 Figure 1 Mechanical design of the 0,4 cm 3coupler, shown with removable coupling plate with a nipple for the attachment of coupling tubing 10 Figure 2 Coupling to a hearing aid receiver by means of coupling tubing . 13 Figure 3 Coupli

    17、ng to an ITE hearing aid 14 Figure 4 Coupling to a receiver in the canal (RIC hearing aid) . 15 Figure 5 Coupling to a BTE hearing aid with 2 mm continuous internal diameter tubing . 16 Figure 6 Coupling to a BTE hearing aid with earmould simulator . 17 Figure 7 Coupling to a BTE hearing aid with th

    18、in coupling tubing 18 Figure 8 Magnitude frequency response of the transfer impedance frequency and the related equivalent volume 19 Figure 9 Comparative measurement of the 0,4 cm 3coupler, the 2 cm 3coupler and the occluded-ear simulator frequency responses . 20 Figure 10 Magnitude frequency respon

    19、ses of acoustic impedance of the 2 cm 3 , the 0,4 cm 3coupler and various hearing aid types 21 Figure 11 Deviation from the normalized coupler volume ratio as a function of the effective volume of the sound source V s22 Figure A.1 Electrical analogue model of the human ear . 27 Figure A.2 Measured t

    20、ransform response of a standard-fitting . 28 Figure A.3 Comparison between the measured and the simulated standard-fitting transform response . 29 Figure A.4 Transform responses for (a) standard-fitting, b) CIC-fitting and (c) deep- insertion-fitting 30 Figure B.1 Test set-up for measuring the coupl

    21、er transfer impedance . 35 Figure B.2 Average frequency response of 8 coupler measurements . 35 Figure B.3 Average transfer impedance of the 0,4 cm 3coupler . 36 PD IEC/TS 62886:2016 4 IEC TS 62886:2016 IEC 2016 Figure B.4 Transfer impedance times frequency re 1 Pa/m 3 in dB and as equivalent volume

    22、 in mm 3in the frequency range 100 Hz to 60 kHz . 36 Figure B.5 Electrical analogue model based on a tube model 39 Figure B.6 Comparison between the measured (solid line) and the simulated (dashed line) transfer impedance . 39 Figure B.7 Frequency responses of simulated 0,4 cm 3coupler input and tra

    23、nsfer impedances 40 Table 1 Values of U maxfor basic measurements 23 Table 2 Distortion test frequencies and input sound pressure levels 24 Table 3 Values of U maxfor basic measurements 25 Table A.1 Transform data for standard-fitting (fitting at reference plane), CIC-fitting and deep-insertion-fitt

    24、ing 31 Table B.1 Transfer impedance of the 0,4 cm 3coupler in the frequency range from 100 Hz to 60 kHz 37 PD IEC/TS 62886:2016IEC TS 62886:2016 IEC 2016 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS HEARING AIDS METHOD FOR MEASURING ELECTROACOUSTIC PERFORMANCE UP TO 16 kHz FOREWORD

    25、 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 promote international co-operation on all questions concerning standardization in the electri

    26、cal 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 Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to techni

    27、cal 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 also participate in this preparation. IEC collaborates closely with the International Organi

    28、zation 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 possible, an international consensus of opinion on the relevant subjects since each technical

    29、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. While all reasonable efforts are made to ensure that the technical content of IEC Publicatio

    30、ns 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 to apply IEC Publications transparently to the maximum extent possible in their national

    31、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 attestation of conformity. Independent certification bodies provide conformity assessment services

    32、 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 this publication. 7) No liability shall attach to IEC or its directors, employees, servants

    33、 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 indirect, or for costs (including legal fees) and expenses arising out of the publication,

    34、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 the correct application of this publication. 9) Attention is drawn to the possibility tha

    35、t 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. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee ma

    36、y propose the publication of a Technical Specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where, for any other reason, there is the future but no immediate pos

    37、sibility of an agreement on an International Standard. Technical Specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC TS 62886, which is a Technical Specification, has been prepared by IEC technical committ

    38、ee 29: Electroacoustics. PD IEC/TS 62886:2016 6 IEC TS 62886:2016 IEC 2016 The text of this Technical Specification is based on the following documents: Enquiry draft Report on voting 29/897/DTS 29/902A/RVC Full information on the voting for the approval of this Technical Specification can be found

    39、in the report 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 the stability date indicated on the IEC website under “http:/webstore

    40、.iec.ch“ in the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour i

    41、nside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. PD IEC/TS 62886:2016IEC TS 62886:2016 IEC 2016 7 INTRODUCTION Advanc

    42、ement in hearing aid design makes it possible to increase the bandwidth of hearing aids up to 16 kHz. Accordingly, there is a need for an accurate and yet robust measurement method for the transducer (receiver, earphone) designer, the hearing aid designer, and the fitter of hearing aids. The 2 cm 3c

    43、oupler as described in IEC 60318-5 is only suitable for measurements up to 8 kHz. The limitation is caused by unfavourable acoustic modes of the coupler. The occluded-ear simulator as described in IEC 60318-4 simulates the average human external ear up to 8 kHz, and can be used as a test coupler up

    44、to 16 kHz. The occluded ear- simulator is designed for a specific insertion depth of the earmould, which is associated with a half-wavelength /2 resonance at about 13,5 kHz. This half-wavelength resonance degrades the reproducibility of measurement results in that frequency range and harmonic distor

    45、tion measurements made at corresponding multiples of the resonance frequency. Also, this resonance represents a complex load to the hearing aid transducer, which makes it more difficult to differentiate between transducer and load related effects. The effective internal volume of the coupler describ

    46、ed in this Technical Specification is 0,4 cm 3 , which is small enough not to produce any resonance in the frequency range below 16 kHz. The frequency response of the magnitude of acoustic impedance follows a pattern of a capacitive load up to about 30 kHz. With a sufficiently high source impedance

    47、and a sufficiently small coupling volume, the 0,4 cm 3coupler produces an approximately 14 dB higher output at 1 kHz in comparison to data obtained with the 2 cm 3coupler. The coupler described in this document will allow the characterisation of hearing aids and transducers, including the verificati

    48、on of simulation models, up to 16 kHz. 0,4 cm 3is also approximately the residual volume of the ear canal when fitted with a CIC hearing aid (completely-in-the-canal) hearing aid, making this coupler particularly useful for this application. In combination with an appropriate real-ear probe micropho

    49、ne measurement, the 0,4 cm 3coupler will enable the derivation of real-ear to coupler difference (RECD) up to 16 kHz. PD IEC/TS 62886:2016 8 IEC TS 62886:2016 IEC 2016 ELECTROACOUSTICS HEARING AIDS METHOD FOR MEASURING ELECTROACOUSTIC PERFORMANCE UP TO 16 kHz 1 Scope IEC TS 62886, which is a Technical Specification, describes a coupler and measurement methods to characterise the electroacoustic performance of hearing aids and insert earpho


    注意事项

    本文(BS PD IEC TS 62886-2016 Electroacoustics Hearing aids Method for measuring electroacoustic performance up to 16 kHz《电声学 助听器 16 kHz及以下电声性能的测量方法》.pdf)为本站会员(appealoxygen216)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开