1、 IEC 60118-15 Edition 1.0 2012-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Hearing aids Part 15: Methods for characterising signal processing in hearing aids with a speech-like signal lectroacoustique Appareils de correction auditive Partie 15: Mthodes de caractrisation du traite
2、ment des signaux dans les appareils de correction auditive avec un signal de type parole IEC60118-15:2012 colourinsideTHIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or util
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16、tion ou si vous avez des questions contactez-nous: csciec.ch. IEC 60118-15 Edition 1.0 2012-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Hearing aids Part 15: Methods for characterising signal processing in hearing aids with a speech-like signal lectroacoustique Appareils de corre
17、ction auditive Partie 15: Mthodes de caractrisation du traitement des signaux dans les appareils de correction auditive avec un signal de type parole INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-88912-932-4 Regis
18、tered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distribu
19、teur agr. colourinside 2 60118-15 IEC:2012 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 8 4 Limitations 9 5 Setup . 9 5.1 System overview . 9 5.2 Estimated insertion gain 11 5.3 Coupler gain 12 6 Test equipment . 12 6.1 Acoustical requiremen
20、ts 12 6.2 Test signal 13 6.2.1 Specification of ISTS . 13 6.2.2 Shaping of the test signal for determining the EIG . 14 6.3 Earphone coupler and attachments . 15 6.3.1 Estimated insertion gain 15 6.3.2 Coupler gain 15 7 Test conditions . 15 7.1 Programming of hearing aid 15 7.2 End user settings for
21、 programming 16 7.2.1 Hearing aid features 16 7.2.2 Vent selection for programming . 16 7.2.3 Directionality . 16 7.3 Audiograms for a typical end-user . 16 8 Measurements and analysis . 18 8.1 Measurements . 18 8.1.1 General . 18 8.1.2 Estimated insertion gain (EIG) . 19 8.1.3 Coupler gain (optiona
22、l for 2 cm3coupler) 19 8.2 Analysis 19 8.2.1 General . 19 8.2.2 Compensating for hearing aid processing delay . 21 8.2.3 Correction for use of 2 cm3coupler for EIG determination . 21 8.2.4 Calculation of the estimated insertion gain for the LTASS of the ISTS (LTASS EIG) . 21 8.2.5 Calculation of the
23、 coupler gain for the LTASS of the ISTS (LTASS coupler gain) (optional) 22 8.2.6 Sectioning of recorded signals for percentile calculations 22 8.2.7 Calculation of the EIG for the 30th, 65thand 99thpercentiles of the ISTS (percentile EIG) 23 8.2.8 Calculation of the coupler gain for the 30th, 65than
24、d 99thpercentiles of the ISTS (Percentile coupler gain) (optional) . 23 9 Data presentation . 24 9.1 LTASS gain (LTASS EIG or LTASS coupler gain) 24 9.2 Percentile gain (percentile EIG or percentile coupler gain) 25 60118-15 IEC:2012 3 9.3 Interpretation of gain views . 26 9.3.1 LTASS gain view . 26
25、 9.3.2 Percentile gain view 26 9.4 Mandatory data . 27 Annex A (informative) International speech test signal (ISTS) 28 Bibliography 32 Figure 1 Measurement setup for the estimated insertion gain . 11 Figure 2 Measurement setup for the coupler gain. 12 Figure 3 ISTS 30th, 65th, 99thpercentiles and L
26、TASS in dB versus one-third-octave bands . 14 Figure 4 Standard audiograms for the flat and moderately sloping group . 17 Figure 5 Standard audiograms for the steep sloping group . 18 Figure 6 Overview of analysis 20 Figure 7 Time alignment of output signal (y) relative to the input signal (x) 21 Fi
27、gure 8 Sectioning of recorded signals . 22 Figure 9 Illustration of the method for obtaining “time aligned gain“ for the 65thpercentile 24 Figure 10 LTASS gain at 3 input sound pressure levels . 24 Figure 11 LTASS gain at 3 input levels relative the LTASS gain at 65 dB input sound pressure level . 2
28、5 Figure 12 Percentile gain for 3 percentiles and corresponding LTASS gain 25 Figure A.1 ISTS level distributions for five third-octave bands as measured from 50 % overlapping 125 ms sections of the ISTS . 31 Table 1 ISTS 30th, 65th, 99thpercentiles and LTASS in dB at one-third-octave bands . 14 Tab
29、le 2 Standard audiograms for the flat and moderately sloping group. 17 Table 3 Standard audiograms for the steep sloping group 18 Table 4 Recommended coupler correction values when using the 2 cm3coupler . 21 4 60118-15 IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS HEARING AI
30、DS Part 15: Methods for characterising signal processing in hearing aids with a speech-like signal FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object
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41、118-15 has been prepared by IEC technical committee 29: Electroacoustics. The text of this standard is based on the following documents: CDV Report on voting 29/719/CDV 29/730A/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the
42、above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 60118-15 IEC:2012 5 A list of all parts of IEC 60118 series, published under the general title Electroacoustics Hearing aids, can be found on the IEC website. The committee has decided that the contents
43、 of this publication 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 publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colo
44、ur inside 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. 6 60118-15 IEC:2012 INTRODUCTION The characterisation of hearing
45、 aids in actual use can differ significantly from those determined in accordance with standards such as IEC 60118-0 and IEC 60118-7. These standards use non speech-like test signals with the hearing aid set to specific settings which are, in general, not comparable with typical user settings. This s
46、tandard describes a recommended speech-like test signal, the International Speech Test Signal (ISTS), and a method for the characterisation of hearing aids using this signal with the hearing aid set to actual user settings or to the manufacturers recommended settings for one of a range of audiograms
47、. For the purposes of this standard the hearing aid is considered to be a combination of the physical hearing aid and the fitting software which accompanies it. 60118-15 IEC:2012 7 ELECTROACOUSTICS HEARING AIDS Part 15: Methods for characterising signal processing in hearing aids with a speech-like
48、signal 1 Scope This part of IEC 60118 specifies a test signal designed to represent normal speech, the International Speech Test Signal (ISTS), together with the procedures and the requirements for measuring the characteristics of signal processing in air-conduction hearing aids. The measurements ar
49、e used to derive the estimated insertion gain (EIG). For the purposes of characterizing a hearing aid for production, supply and delivery, the procedures and requirements to derive the coupler gain on a 2 cm3coupler as defined in IEC 60318-5 are also specified. The procedure uses a speech-like test signal and the hearing aid settings are set to those programmed for an individual end-user or those
