ASA S3 55 PART 5-2014 American National Standard Electroacoustics C Simulators of Human Head and Ear C Part 5 2 cm3 Coupler for the Measurement of Hearing Aids and Earphones Couple.pdf

1、 ANSI/ASA S3.55-2014/Part 5 / IEC 60318-5:2006 (MOD) AMERICAN NATIONAL STANDARD 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 (a modified nationally adopted international standard) A

2、ccredited Standards Committee S3, Bioacoustics Standards Secretariat Acoustical Society of America 1305 Walt Whitman Road, Suite 300 Melville, NY 11747ANSI/ASA S3.55-2014/Part 5 /IEC60318-5:2006(MOD) The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary stan

3、dards development and the clearinghouse in the U.S.A. for information 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 applica

4、tions. ANSI/ASA S3.55-2014/Part 5 / IEC 60318-5:2006 (MOD) AMERICAN NATIONAL STANDARD Electroacoustics Simulators of Human Head and Ear Part 5: 2 cm3 Coupler for the Measurement of Hearing Aids and Earphones Coupled to the Ear by Means of Ear Inserts (a modified nationally adopted international stan

5、dard) Secretariat: Acoustical Society of America Approved on July 21, 2014 by: American National Standards Institute, Inc. Abstract This part of ANSI/ASA S3.55 / IEC 60318 describes an acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its ph

6、ysical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear molds or similar devices. The sound pressure developed by an earphone is not, in general, the same in the coup

7、ler as in a persons ear. However, it can be used as a simple and ready means for the exchange of specifications and of physical data on hearing aids and for the calibration of specified insert earphones used in audiometry. AMERICAN NATIONAL STANDARDS ON BIOACOUSTICS The Acoustical Society of America

8、 (ASA) provides the Secretariat for Accredited Standards Committees S1 on Acoustics, S2 on Mechanical 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 ass

9、ociations, organizations with a general interest, and government representatives). The standards are 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 stand

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13、 the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially 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

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15、res not conforming to the Standards. NOTICE: This American National Standard may be revised or withdrawn 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 AS

16、A Secretariat 1305 Walt Whitman Road, Suite 300 Melville, New York 11747 Telephone: 1 (631) 390-0215 Fax: 1 (631) 923-2875 E-mail: asastdsacousticalsociety.org 2014 by Acoustical Society of America. This standard may not be reproduced in whole or in part in any form for sale, promotion, or any comme

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18、f IEC and ASA. No part of this publication may be reproduced in any form, including an electronic retrieval 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)

19、. 2014 Acoustical Society of America All rights reserved iContents 1 Scope . 1 2 Normative references 1 3 Terms and definitions 1 4 Construction . 2 4.1 General 2 4.2 Cavity dimensions 2 4.3 Calibrated pressure type microphone 2 4.4 Static pressure equalization . 3 5 Calibration 3 5.1 Reference envi

20、ronmental conditions . 3 5.2 Calibration procedure . 4 6 Coupling of earphones and hearing aids to the coupler 4 6.1 Audiometers with insert earphones 4 6.2 Hearing aids of the in-the-ear type. 4 6.3 Hearing aids with insert earphone . 4 6.4 Hearing aids of the behind-the-ear type and spectacle hear

21、ing aids 7 7 Maximum permitted expanded uncertainty of measurements . 9 Bibliography . 10 Figures Figure 1 Connection of an in-the-ear type of hearing aid to the coupler 5 Figure 2 Connection of an insert earphone to the coupler . 6 Figure 3 Connection of a behind-the-ear type of hearing aid to the

22、coupler 8 Tables Table 1 Values of Umaxfor basic measurements 9 2014 Acoustical Society of America All rights reserved ii Foreword This Foreword is for information only, and is not a part of the American National Standard ANSI/ASA S3.55-2014/Part 5 / IEC 60318-5:2006 (MOD) American National Standard

23、 Electroacoustics Simulators of Human Head and Ear Part 5: 2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts. As such, this Foreword may contain material that has not been subjected to public review or a consensus process. In addition, it does

24、 not contain requirements necessary for conformance to the standard. This standard comprises a part of a group of definitions, standards, and specifications for use in bioacoustics. It was developed and approved by Accredited Standards Committee S3 Bioacoustics, under its approved operating procedur

25、es. 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 measurement and test, and terminology in the fields of psychological and physiological acoustics, includi

26、ng aspects of general acoustics which pertain to biological safety, tolerance and comfort. This standard is a modified nationally adopted international standard (NAIS). It was undertaken as part of the revision of ANSI/ASA S3.7-1995 (R2008), Method for Coupler Calibration of Earphones, which, in add

27、ition to coupler calibration methods, contains detailed information about the audiometric ear, the 6cc coupler, and the 2cc coupler. Several years ago, IEC 60318 was reorganized into several parts, which now include the same information about the aforementioned couplers (IEC 60318, Parts 1, 3, and 5

28、, respectively). Given that the manufacture of these couplers has changed little if at all in more than 25 years, the fact that the IEC and ANSI/ASA specifications for these couplers are essentially identical, and the fact that manufacturers of these couplers do not produce different versions of the

29、 devices to meet alternative versions of the standards, harmonization was deemed appropriate. The first step in this process has been the move of the detailed coupler specifications from the previous version of ANSI/ASA S3.7 to NAIS ANSI/ASA S3.55, Parts 1, 3, and 5, which correspond directly to the

30、ir IEC 60318 counterparts. References in other standards that previously pointed to ANSI/ASA S3.7 for a particular coupler will now point to the appropriate NAIS ANSI/ASA S3.55 part instead, as these documents get revised and updated. The next revision of ANSI/ASA S3.7 will focus solely on the calib

31、ration methods for earphones, and will also point to the appropriate NAIS ANSI/ASA S3.55 part, where the detailed coupler information now resides. This standard is a modified national adoption of IEC 60318-5 Ed. 1.0 b:2006 Electroacoustics Simulators of Human Head and Ear Part 5: 2 cm3 coupler for t

32、he measurement of hearing aids and earphones coupled to the ear by means of ear inserts which was prepared by IEC/TC 29, Electroacoustics. In conformance with ANSI and IEC rules, the words “this part of ANSI/ASA S3.55 / IEC 60318” replace the words “this part of IEC 60318” where they appear in the I

33、EC 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. (Note that Figures 2 and 3 provided by the IEC were not revisable and decimal commas are used.) All other additions and modif

34、ications are shown in a bold blue font within a blue box and are identified as U.S. Modifications. 2014 Acoustical Society of America All rights reserved iiiAt the time this Standard was submitted to Accredited Standards Committee S3, Bioacoustics for approval, the membership was as follows: C.J. St

35、ruck, Chair Vacant, Vice-Chair S.B. Blaeser, Secretary Acoustical Society of America C.J. Struck . M.D. Burkhard (Alt.) American Academy of Audiology . .C. Schweitzer T. Ricketts (Alt.) American Academy of Otolaryngology, Head and Neck Surgery, Inc. .R.A. Dobie . L.A. Michael (Alt.) American Industr

36、ial Hygiene Association . T.K. Madison D. Driscoll (Alt.) American Speech-Language-Hearing Association (ASHA) . L.A. Wilber . N. DiSarno (Alt.) Beltone/GN Resound S. Petrovic Council for Accreditation in Occupational Hearing Conservation (CAOHC) . L.D. Hager ETS Lindgren Acoustic Systems . S. Dunlap

37、 . D. Winker (Alt.) Etymotic Research, Inc. M.C. Killion . J.K. Stewart (Alt.) Food and Drug Administration S-C Peng G.R.A.S. Sound FAX: 631- 923-2875; E-mail: asastdsacousticalsociety.org. AMERICAN NATIONAL STANDARD ANSI/ASA S3.55-2014/Part 5 / IEC 60318-5:2006 (MOD) 2014 Acoustical Society of Amer

38、ica All rights reserved 1American National Standard Electroacoustics Simulators of Human Head and Ear Part 5: 2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts 1 Scope This part of ANSI/ASA S3.55 / IEC 60318 describes an acoustic coupler for l

39、oading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear molds or similar

40、devices. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a persons ear. However, it can be used as a simple and ready means for the exchange of specifications and of physical data on hearing aids and for the calibration of specified insert earphones used

41、 in audiometry. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61094-

42、4, Measurement microphones Part 4: Specifications for working standard microphones ISO 389-2, Acoustics Reference zero for the calibration of audiometric equipment Part 2: Reference equivalent threshold sound pressure levels for pure tones and insert earphones BIPM/IEC/ISO/IUPAC/IUPAP/OIML:1995, Gui

43、de to the expression of uncertainty in measurement (GUM) 3 Terms and definitions For the purposes of this part of ANSI/ASA S3.55 / IEC 60318, the following terms and definitions apply: 3.1 acoustic coupler cavity of predetermined shape and volume which is used for the calibration of an earphone in c

44、onjunction with a microphone to measure the sound pressure developed within the cavity 3.2 effective volume equivalent volume of air of the acoustical compliance of the coupler formed by the cavity and the microphone at a frequency of 250 Hz ANSI/ASA S3.55-2014/Part 5 / IEC 60318-5:2006 (MOD) 2014 A

45、coustical Society of America All rights reserved 2U.S. ADDITION: 3.3 insert earphone An earphone with the tip inside the ear canal, coupled by a tube or ear mold. 4 Construction 4.1 General The coupler consists essentially of a cylindrical cavity whose effective volume is nominally 2 000 mm3. The ba

46、se of the cylindrical cavity contains the diaphragm of a microphone, or a microphone with an adapter. A protection grid may or may not be fitted. The microphone measures the sound pressure level in the coupler. The coupler shall be constructed of hard, dimensionally stable, non-porous and non-magnet

47、ic material. The general construction of the coupler and mounting of the microphone shall aim to minimize the response of the microphone to vibration (for example from an earphone) or to extraneous sound outside the cavity. NOTE The external diameter of the coupler should be kept as small as possibl

48、e in order to minimize diffractional errors which might affect the measurements when the coupler has to be placed in a free sound field. Where tolerances are specified in this part of ANSI/ASA S3.55 / IEC 60318, these shall be reduced by an amount equal to the actual expanded measurement uncertainty

49、 of the test laboratory before deciding if a device conforms with the stated requirement. 4.2 Cavity dimensions 4.2.1 The critical dimensions of the coupler are those which determine the shape and volume of the cavity terminated by a measurement microphone, and the capillary leak. 4.2.2 The effective volume of the coupler shall be: 2 000 mm3 70 mm3. The contributions of any front cavity associated with the microphone and of the finite diaphragm impedance, etc., shall be included in the effective volume of the coupler. Therefor