EN 60118-15-2012 en Electroacoustics - Hearing aids - Part 15 Methods for characterising signal processing in hearing aids with a speech-like signal.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationElectroacoustics Hearing aidsPart 15: Methods for characterising signal processing in hearing aids with a speech-like signalBS EN 60118-15:2012National forewordThis British Stand

2、ard is the UK implementation of EN 60118-15:2012. It isidentical to IEC 60118-15:2012.The UK participation in its preparation was entrusted to Technical CommitteeEPL/29, Electroacoustics.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication

3、 does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 68525 5ICS 17.140.50Compliance with a British Standard cannot confer immunity fromleg

4、al obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 May 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60118-15:2012EUROPEAN STANDARD EN 60118-15 NORME EUROPENNE EUROPISCHE NORM April 201

5、2 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved wo

6、rldwide for CENELEC members. Ref. No. EN 60118-15:2012 E ICS 17.140.50 English version Electroacoustics - Hearing aids - Part 15: Methods for characterising signal processing in hearing aids with a speech-like signal (IEC 60118-15:2012) Electroacoustique - Appareils de correction auditive - Partie 1

7、5: Mthodes de caractrisation du traitement des signaux dans les appareils de correction auditive avec un signal de type parole (CEI 60118-15:2012) Akustik - Hrgerte - Teil 15: Methoden zur Charakterisierung der Hrgerte-Signalverarbeitung (IEC 60118-15:2012) This European Standard was approved by CEN

8、ELEC on 2012-03-27. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standa

9、rds may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language

10、 and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irel

11、and, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 60118-15:2012EN 60118-15:2012 - 2 - Foreword The text of document 29/719/CDV, future edition 1 of IEC 60118-15, p

12、repared by IEC/TC 29 “Electroacoustics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60118-15:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsem

13、ent (dop) 2012-12-27 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-03-27 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible

14、for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60118-15:2012 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indica

15、ted: IEC 61669 NOTE Harmonized as EN 61669. IEC 60118-0:1983 + A1:1994 NOTE Harmonized as EN 60118-0:1993 + A1:1994 (not modified). BS EN 60118-15:2012- 3 - EN 60118-15:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publications The fol

16、lowing documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an i

17、nternational publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60118-7 - Electroacoustics - Hearing aids - Part 7: Measurement of the performance characteristics of hearing aids for production, supply and deli

18、very quality assurance purposes EN 60118-7 - IEC 60118-8 2005 Electroacoustics - Hearing aids - Part 8: Methods of measurement of performance characteristics of hearing aids under simulated in situ working conditions EN 60118-8 2005 IEC 60318-4 - Electroacoustics - Simulators of human head and ear -

19、 Part 4: Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts EN 60318-4 - IEC 60318-5 - Electroacoustics - Simulators of human head and ear - Part 5: 2 cm coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inser

20、ts EN 60318-5 - IEC 61260 - Electroacoustics - Octave-band and fractional-octave-band filters EN 61260 - BS EN 60118-15:2012 2 60118-15 IEC:2012 CONTENTS 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 Estima

21、ted insertion gain 11 5.3 Coupler gain 12 6 Test equipment . 12 6.1 Acoustical requirements 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 g

22、ain 15 7 Test conditions . 15 7.1 Programming of hearing aid 15 7.2 End user settings for 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

23、 8.1.1 General . 18 8.1.2 Estimated insertion gain (EIG) . 19 8.1.3 Coupler gain (optional 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 est

24、imated insertion gain for the LTASS of the ISTS (LTASS EIG) . 21 8.2.5 Calculation of the 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 o

25、f the ISTS (percentile EIG) 23 8.2.8 Calculation of the coupler gain for the 30th, 65thand 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

26、) 25 BS EN 60118-15:201260118-15 IEC:2012 3 9.3 Interpretation of gain views . 26 9.3.1 LTASS gain view . 26 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 g

27、ain . 11 Figure 2 Measurement setup for the coupler gain. 12 Figure 3 ISTS 30th, 65th, 99thpercentiles and LTASS 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

28、 Overview of analysis 20 Figure 7 Time alignment of output signal (y) relative to the input signal (x) 21 Figure 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

29、 . 24 Figure 11 LTASS gain at 3 input levels relative the LTASS gain at 65 dB input sound pressure level . 25 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

30、of the ISTS . 31 Table 1 ISTS 30th, 65th, 99thpercentiles and LTASS in dB at one-third-octave bands . 14 Table 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

31、 cm3coupler . 21 BS EN 60118-15:2012 6 60118-15 IEC:2012 INTRODUCTION The characterisation of hearing 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

32、aid set to specific settings which are, in general, not comparable with typical user settings. This standard 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

33、to actual user settings or to the manufacturers recommended settings for one of a range of audiograms. 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. BS EN 60118-15:201260118-15 IEC:2012 7

34、 ELECTROACOUSTICS HEARING AIDS Part 15: Methods for characterising signal processing in hearing aids with a speech-like 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

35、 requirements for measuring the characteristics of signal processing in air-conduction hearing aids. The measurements are 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

36、 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 recommended by the manufacturer for a typical end-user for a range of flat, mode

37、rately sloping or steep sloping audiograms, so that the measured characteristics are comparable to those which may be obtained by a wearer at typical user settings. The purpose of this standard is to ensure that the same measurements made on a hearing aid following the procedures described, and usin

38、g equipment complying with these requirements, give substantially the same results. Measurements of the characteristics of signal processing in hearing aids which apply non-linear processing techniques are valid only for the test signal used. Measurements which require a different test signal or tes

39、t conditions are outside the scope of this standard. Conformance to the specifications in this standard is demonstrated only when the result of a measurement, extended by the actual expanded uncertainty of measurement of the testing laboratory, lies fully within the tolerances specified in this stan

40、dard as given by the values given in 6.1. Measurement methods that take into account the acoustic coupling of a hearing aid to the individual ear and the acoustic influence of the individual anatomical variations of an end-user on the acoustical performance of the hearing aid, known as real-ear meas

41、urements, are outside the scope of this particular standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the l

42、atest edition of the referenced document (including any amendments) applies. IEC 60118-7, Electroacoustics Hearing aids Part 7: Measurement of the performance characteristics of hearing aids for production, supply and delivery quality assurance purposes IEC 60118-8:2005, Electroacoustics Hearing aid

43、s Part 8: Methods of measurement of performance characteristics of hearing aids under simulated in situ working conditions BS EN 60118-15:2012 8 60118-15 IEC:2012 IEC 60318-4, Electroacoustics Simulators of human head and ear Part 4: Occluded-ear simulator for the measurement of earphones coupled to

44、 the ear by means of ear inserts IEC 60318-5, Electroacoustics Simulators of human head and ear Part 5: 2 cm3coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts IEC 61260, Electroacoustics Octave-band and fractional-octave-band filters 3 Terms and def

45、initions For the purposes of this document, the following terms and definitions apply: 3.1 sound pressure level all sound pressure levels specified are measured in decibels (dB) referenced to 20 Pa 3.2 percentile sound pressure level sound pressure level, in dB, below which a certain percentage of t

46、he measured sound pressure levels fall, measured in a 125 ms time interval, over a stated measurement period Note 1 to entry: As an example: The 30th percentile sound pressure level is the sound pressure level below which 30 % of the measured sound pressure levels are found, and the remaining 70 % o

47、f the measured sound pressure levels are higher. Note 2 to entry: The 99th percentile may be interpreted as a peak sound pressure level indicator. Note 3 to entry: The definition of percentile used here is according to general statistics. This definition may differ from other sciences such as acoust

48、ics. 3.3 international speech test signal ISTS speech-like test signal as defined in this standard 3.4 long term average speech spectrum LTASS sound pressure level measured in one-third-octave bands averaged over a long time period of speech Note 1 to entry: For this standard a time period of 45 s i

49、s chosen. 3.5 occluded ear simulator OES ear simulator as defined in IEC 60318-4 3.6 estimated insertion gain of a hearing aid EIG estimate of the real-ear insertion gain as may be obtained across a group of persons Note 1 to entry: This estimate is based on measurements of hearing aid gain using an occluded ear simulator or a 2 cm3coupler, as defined in IEC 60318-5. BS EN 60118-15:201260118-15 IEC:2012 9 3.7 coupler gain of a hearing aid hearing aid gain mea