ANSI ASA S3.42 PART 2-2012 American National Standard Testing Hearing Aids C Part 2 Methods for characterizing signal processing in hearing aids with a speech-like signal (a nation.pdf

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1、 ANSI/ASA S3.42-2012/Part 2 / IEC 60118-15:2012 AMERICAN NATIONAL STANDARD Testing Hearing Aids Part 2: Methods for characterizing signal processing in hearing aids with a speech-like signal (a nationally adopted international standard) Accredited Standards Committee S3, Bioacoustics Standards Secre

2、tariatAcoustical Society of America 35 Pinelawn Road, Suite 114 E Melville, NY 11747-3177ANSI/ASAS3.42-2012/Part 2 /IEC60118-15:2012 The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghouse in the U.S.A. for informati

3、on on national and international standards. The Acoustical Society of America (ASA) is an organization of scientists and engineers formed in 1929 to increase and diffuse the knowledge of acoustics and to promote its practical applications. ANSI/ASA S3.42-2012/Part 2 / IEC 60118-15:2012 AMERICAN NATI

4、ONAL STANDARD Testing Hearing Aids Part 2: Methods for characterizing signal processing in hearing aids with a speech-like signal Secretariat: Acoustical Society of America Approved on September 20, 2012 by: American National Standards Institute, Inc. Abstract This standard describes a recommended s

5、peech-like test signal, the International Speech Test Signal (ISTS), and a method for the characterization 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. For the purposes of this standa

6、rd the hearing aid is considered to be a combination of the physical hearing aid and the fitting software which accompanies it. AMERICAN NATIONAL STANDARDS ON ACOUSTICS The Acoustical Society of America (ASA) provides the Secretariat for Accredited Standards Committees S1 on Acoustics, S2 on Mechani

7、cal Vibration and Shock, S3 on Bioacoustics, S3/SC 1 on Animal Bioacoustics, and S12 on Noise. These committees have wide representation from the technical community (manufacturers, consumers, trade associations, organizations with a general interest, and government representatives). The standards a

8、re published by the Acoustical Society of America as American National Standards after approval by their respective Standards Committees and the American National Standards Institute (ANSI). These standards are developed and published as a public service to provide standards useful to the public, in

9、dustry, and consumers, and to Federal, State, and local governments. Each of the Accredited Standards Committees (operating in accordance with procedures approved by ANSI) is responsible for developing, voting upon, and maintaining or revising its own Standards. The ASA Standards Secretariat adminis

10、ters Committee organization and activity and provides liaison between the Accredited Standards Committees and ANSI. After the Standards have been produced and adopted by the Accredited Standards Committees, and approved as American National Standards by ANSI, the ASA Standards Secretariat arranges f

11、or their publication and distribution. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materi

12、ally affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered and that a concerted effort be made towards their resolution. The use of an American National Standard is completely vo

13、luntary. Their existence does not in any respect preclude anyone, whether he or she has approved the Standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the Standards. NOTICE: This American National Standard may be revised or wit

14、hdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this Standard. Acoustical Society of America ASA Secretariat 35 Pinelawn Road, Suite 114E Melville, New York 11747-3177 Telephone: 1 (631) 390-02

15、15 Fax: 1 (631) 390-0217 E-mail: asastdsaip.org 2012 by Acoustical Society of America. This standard may not be reproduced in whole or in part in any form for sale, promotion, or any commercial purpose, or any purpose not falling within the provisions of the U.S. Copyright Act of 1976, without prior

16、 written permission of the publisher. For permission, address a request to the Standards Secretariat of the Acoustical Society of America. These materials are subject to copyright claims of IEC, ANSI, and ASA. No part of this publication may be reproduced in any form, including an electronic retriev

17、al system, without the prior written permission of the Acoustical Society of America (ASA). All requests pertaining to this standard should be submitted to the Acoustical Society of America (ASA). 2012 Acoustical Society of America All rights reserved iContents 1 Scope 1 2 Normative references 1 3 T

18、erms and definitions 2 4 Limitations . 3 5 Setup . 3 5.1 System overview . 3 5.2 Estimated insertion gain 4 5.3 Coupler gain 5 6 Test equipment . 6 6.1 Acoustical requirements 6 6.2 Test signal . 6 6.3 Earphone coupler and attachments 8 7 Test conditions 9 7.1 Programming of hearing aid 9 7.2 End us

19、er settings for programming . 9 7.3 Audiograms for a typical end-user 10 8 Measurements and analysis . 12 8.1 Measurements 12 8.2 Analysis . 13 9 Data presentation 18 9.1 LTASS gain (LTASS EIG or LTASS coupler gain) . 18 9.2 Percentile gain (percentile EIG or percentile coupler gain) 19 9.3 Interpre

20、tation of gain views . 20 9.4 Mandatory data . 21 Annex A (informative) International speech test signal (ISTS) 23 A.1 Overall specification of ISTS . 23 A.2 Design of the ISTS 23 A.3 Analysis of the ISTS 25 Bibliography . 27 2012 Acoustical Society of America All rights reserved ii Tables Table 1 I

21、STS 30th, 65th, 99thpercentiles and LTASS in dB at one-third-octave bands 8 Table 2 Standard audiograms for the flat and moderately sloping group 10 Table 3 Standard audiograms for the steep sloping group 11 Table 4 Recommended coupler correction values when using the 2 cm3coupler 15 Figures Figure

22、1 Measurement setup for the estimated insertion gain 4 Figure 2 Measurement setup for the coupler gain 5 Figure 3 ISTS 30th, 65th, 99thpercentiles and LTASS in dB versus one-third-octave bands . 7 Figure 4 Standard audiograms for the flat and moderately sloping group 10 Figure 5 Standard audiograms

23、for the steep sloping group 11 Figure 6 Overview of analysis . 14 Figure 7 Time alignment of output signal (y) relative to the input signal (x) 15 Figure 8 Sectioning of recorded signals 16 Figure 9 Illustration of the method for obtaining “time aligned gain“ for the 65thpercentile 18 Figure 10 LTAS

24、S gain at 3 input sound pressure levels . 19 Figure 11 LTASS gain at 3 input levels relative the LTASS gain at 65 dB input sound pressure level 19 Figure 12 Percentile gain for 3 percentiles and corresponding LTASS gain 20 Figure 13 Percentile gain for 3 percentiles relative to LTASS gain . 20 Figur

25、e A.1 ISTS level distributions for five third-octave bands as measured from 50 % overlapping 125 ms sections of the ISTS . 26 2012 Acoustical Society of America All rights reserved iiiForeword This Foreword is for information only and is not a part of the American National Standard ANSI/ASA S3.42-20

26、12/Part 2 / IEC 60118-15:2012 American National Standard Testing Hearing Aids Part 2: Methods for characterizing signal processing in hearing aids with a speech-like signal. This standard comprises a part of a group of definitions, standards, and specifications for use in bioacoustics. It was develo

27、ped and approved by Accredited Standards Committee S3, Bioacoustics, under its approved operating procedures. Those procedures have been accredited by the American National Standards Institute (ANSI). The Scope of Accredited Standards Committee S3 is as follows: Standards, specifications, methods of

28、 measurement and test, and terminology in the fields of psychological and physiological acoustics, including aspects of general acoustics which pertain to biological safety, tolerance and comfort. This standard is an identical national adoption of IEC 60118-15 Electroacoustics Hearing aids Part 15:

29、Methods for characterizing signal processing in hearing aids with a speech-like signal, which was prepared by IEC/TC 29, Electroacoustics. However, in conformance with ANSI and IEC rules, the words “American National Standard“ replace the words “International Standard“ or “this part of IEC 60118“ wh

30、ere they appear in the IEC document, decimal points were substituted in place of the decimal commas used in IEC documents, and American English spelling is used in place of British English spelling. A list of the ANSI or ANSI/ASA standards which are similar to the IEC standards referenced in IEC 601

31、18-15 is included below. ANSI/ASA S3.22-2009 American National Standard Specification of Hearing Aid Characteristics is similar to IEC 60118-7. ANSI/ASA S3.35-2010 American National Standard Method of Measurement of Performance Characteristics of Hearing Aids Under Simulated Real-Ear Working Conditi

32、ons is similar to IEC 60118-8. ANSI/ASA S3.25-2009 American National Standard for an Occluded Ear Simulator is similar to IEC 60318-4. ANSI/ASA S3.7-1995 (R 2008) American National Standard Methods for Coupler Calibration of Earphones has sections that are similar to IEC 60318-5. ANSI S1.4-1983 (R 2

33、006) American National Standard Specification for Sound Level Meters is similar to IEC 61260. At the time this Nationally Adopted International Standard was published, the test signal mentioned in Annex A (the ISTS) was freely available from the European Hearing Instrument Manufacturers Association

34、website: http:/ 2012 Acoustical Society of America All rights reserved iv At the time this Standard was submitted to Accredited Standards Committee S3, Bioacoustics, for approval, the membership was as follows: C.J. Struck, Chair G.J. Frye, Vice-Chair S.B. Blaeser, Secretary Acoustical Society of Am

35、erica C.J. Struck M.D. Burkhard (Alt.) American Academy of Audiology . .D. Ostergren . S. Gordon-Salant (Alt.) American Academy of Otolaryngology, Head and Neck Surgery, Inc. .R.A. Dobie . L.A. Michael (Alt.) American Industrial Hygiene Association . T.K. Madison D. Driscoll (Alt.) American Speech-L

36、anguage-Hearing Association (ASHA) . L.A. Wilber P. Mason (Alt.) Beltone/GN Resound S. Petrovic Council for Accreditation in Occupational Hearing Conservation (CAOHC) . L.D. Hager ETS Lindgren Acoustic Systems . S. Dunlap . D. Winker (Alt.) Etymotic Research, Inc. M.C. Killion . J.K. Stewart (Alt.)

37、Food and Drug Administration . S-C Peng Frye Electronics, Inc. G.J. Frye K.E. Frye (Alt.) G.R.A.S. Sound FAX: 631-390-0217; E-mail: asastdsaip.org. 2012 Acoustical Society of America All rights reserved vi Introduction The characterization of hearing aids in actual use can differ significantly from

38、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 standard describes a recommended speech-like test s

39、ignal, the International Speech Test Signal (ISTS), and a method for the characterization 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. For the purposes of this standard the hearing ai

40、d is considered to be a combination of the physical hearing aid and the fitting software which accompanies it. AMERICAN NATIONAL STANDARD ANSI/ASA S3.42-2012/Part 2 /IEC 60118-15:2012 2012 Acoustical Society of America All rights reserved 1American National Standard Testing Hearing Aids Part 2: Meth

41、ods for characterizing signal processing in hearing aids with a speech-like signal 1 Scope This American National Standard 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 cha

42、racteristics 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 the coupler gain on a 2 cm3coupler

43、 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, moderately sloping or steep sloping aud

44、iograms, 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 using equipment complying with these re

45、quirements, 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 test conditions are outside the scope

46、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 standard as given by the values given i

47、n 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 measurements, are outside the scope of

48、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 latest edition of the referenced doc

49、ument (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 aids Part 8: Methods of measurement of performance characteristics of hearing aids under simulated in situ working conditions IEC 60318-4, Electroacoustics Simulators of human head and ear Part 4: