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1、BRITISH STANDARD BS ISO 12124:2001 Acoustics Procedures for the measurement of real-ear acoustical characteristics of hearing aids ICS 17.140.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Unco
2、ntrolled Copy, (c) BSI BS ISO 12124:2001 This British Standard, having been prepared under the direction of the Health and Environment Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 July 2001 BSI 07-2001 ISBN 0 580 37526 9 National foreword
3、 This British Standard reproduces verbatim ISO 12124:2001 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to Subcommittee EH/1/1, Hearing, which has the responsibility to: A list of organizations represented
4、 on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or
5、by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer im
6、munity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate th
7、em in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 17 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publica
8、tion Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 12124 First edition 2001-03-15 Reference number ISO 12124:2001(E) Acoustics Procedures for the measurement of real-ear acoustical character
9、istics of hearing aids Acoustique Mthodes pour le mesurage des caractristiques acoustiques des appareils de correction auditive sur loreille relle Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) ii I Licensed Copy: sheffiel
10、dun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) diii ContentsPage 1Scope .1 2Normative references .1 3Terms and definitions 1 4Limitations 7 5Conditions for test environment 7 5.1Environmental conditions 7 5.2Ambient background noise 8 5.3Acousti
11、cal properties .8 5.4Sound field characteristics .8 6Preparation of subject .8 6.1Otoscopic examination 8 6.2Position of subject 8 6.3Instructions to subject 8 7Measurement procedure 9 7.1Equipment .9 7.2Calibration .9 7.3Equalization methods 9 7.4Test signal 9 7.5Location of the subject .10 7.6Loca
12、tion of the tester .10 7.7Choice of field reference point .10 7.8Choice of measurement point 10 7.9Location and coupling of the hearing aid .10 7.10Real-ear unaided response (REUR) curve 10 7.11Real-ear unaided gain (REUG) curve 11 7.12Real-ear occluded response (REOR) curve 11 7.13Real-ear occluded
13、 gain (REOG) curve 12 7.14Real-ear aided response (REAR) curve 12 7.15Real-ear aided gain (REAG) curve 13 7.16Real-ear insertion gain (REIG) curve 13 8Data to be recorded 13 Annex APositioning the probe microphone sound inlet at the measurement point 15 Bibliography.17 Licensed Copy: sheffieldun she
14、ffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally ca
15、rried out through ISO technical com- mittees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liai- son with ISO, also take part in the
16、work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical
17、 committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rig
18、hts. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 12124 was prepared by Technical Committee ISO/TC 43,Acoustics. Annex A of this International Standard is for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22
19、:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) dv Introduction The performance characteristics 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, due to differing acoustical influence and co
20、upling presented by individual ears. Measurement methods that take into account the acoustic coupling and the acoustical influence of the individual wearer on the performance of hearing aids are therefore important in the fitting of these devices. Such measurement methods have come to be known as “r
21、eal-ear measurements“ and are sometimes per- formed clinically in less than ideal acoustic environments. The accuracy and repeatability of measurements made under such conditions are complex functions of the sound field, the test environment, the nature of the test signal, the hearing aid under eval
22、uation, the method of test signal control, the location of the sound source, the nature of the data acquisition, analysis and presentation, as well as the degree of subject movement permitted. This International Standard details the terminology, test environment and test methods, and defines the nec
23、essary reference points to be used for the measurement of real-ear acoustical characteristics of hearing aids. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Un
24、controlled Copy, (c) BSI INTERNATIONAL STANDARDISO 12124:2001(E) d1 Acoustics Procedures for the measurement of real-ear acoustical characteristics of hearing aids 1Scope This International Standard specifies procedures and requirements for measuring the real-ear acoustical character- istics of hear
25、ing aids. Its purpose is to ensure that the same measurements made on a given hearing aid on a given human ear and a given hearing aid, following the procedures described and using equipment complying with the re- quirements of IEC 61669, give substantially the same results. Measurements of real-ear
26、 acoustical characteristics of hearing aids which apply non-linear or analytical processing techniques are valid only for the test signals used and conditions employed. These measurements should be per- formed in accordance with the hearing aid manufacturers recommendations as they may require speci
27、fic test signals or test conditions outside the scope of this International Standard. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to
28、, or revisions of, any of these publica- tions do not apply. However, parties to agreements based on this International Standard are encouraged to investi- gate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition
29、 of the normative document referred to applies. Members of ISO and IEC maintain reg- isters of currently valid International Standards. ISO 8253-2,Acoustics Audiometric test methods Part 2: Sound field audiometry with pure tone and narrow- band test signals. IEC 60942,Electroacoustics Sound calibrat
30、ors. IEC 61669,Electroacoustics Equipment for the measurement of real-ear acoustical characteristics of hearing aids. 3Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 test signal acoustic signal at the field reference point 3.2 su
31、bject person in whose ear canal the hearing aid performance is being characterized 3.3 subject test position position with subject seated in a reproducible upright position with the head erect and the subject reference point lo- cated on the test axis at the working distance Licensed Copy: sheffield
32、un sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) 2 3.4 subject reference point point bisecting the line joining the centres of the openings of the ear canals of the subject (at the junction between concha and ear canal) See Figure 1. NOTEIn cases o
33、f severe head shape abnormality or asymmetry, it may not be easy to determine the reference point of the sub- ject. The subject reference point used should then be stated. 3.5 test axis line joining the subject reference point to the sound source, passing along the axis of the sound source See Figur
34、e 1. 3.6 working distance distance from the subject reference point to the plane of the mounting ring or protective grille of the sound source, measured along the test axis See Figure 1. 3.7 sound pressure level SPL 20 times the logarithm to the base 10 of the ratio of a given root-mean-square sound
35、 pressure to the reference sound pressure NOTE 1Based on IEC 60050-801 (International Electrotechnical Vocabulary). NOTE 2Throughout this International Standard, all sound pressure levels refer to a reference level of. 3.8 band sound pressure level sound pressure level measured for a defined band 3.
36、9 test signal level level of the test signal expressed as a sound pressure level NOTE 1It is expressed in decibels (dB). NOTE 2For broad-band signals, the frequency spectrum should be specified and stated. 3.10 equalization process of controlling the test signal level as a function of frequency such
37、 that it does not vary from the desired level 3.11 reference microphone microphone used to measure the test signal level in the measurement process and/or to control it in the equalization process See Figure 2. NOTEAlternatively it may be referred to as the controlling microphone. 20Pa Licensed Copy
38、: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) d3 3.12 sound inlet aperture through which sound enters a microphone and at which the microphone is calibrated NOTEIn the case of a probe microphone (see 3.15) which includes an extension
39、tube, this will be the open end of the probe tube. 3.13 field reference point point at which the sound inlet of the reference microphone is located during equalization and/or measurement See Figure 2. 3.14 tester person carrying out the test on the subject 3.15 probe microphone microphone adapted to
40、 determine the sound pressure level in the ear canal NOTEThe probe microphone may include an extension tube (see Figure 2). 3.16 test ear ear of the subject in which the sound inlet of the probe microphone is placed 3.17 axis of rotation straight line about which the subject can be rotated, passing
41、through the subject reference point and lying in the ver- tical plane of symmetry See Figure 1. 3.18 azimuth angle of sound incidence angle between the plane of symmetry of the subject and the plane defined by the axis of rotation and the test axis See Figure 1. NOTEWhen the subject faces the sound
42、source, the azimuth angle of sound incidence is defined as. When the test ear of the subject faces the sound source, the azimuth angle is defined as. When the non-test ear faces the sound source, the angle is defined as. 3.19 subject reference plane horizontal plane that contains the subject referen
43、ce point See Figure 1. 3.20 elevation angle of sound incidence angle between the subject reference plane and the test axis See Figure 1. NOTEWhen the top of the subject points towards the sound source, the elevation angle is defined as. When the test axis lies in the reference plane, the elevation a
44、ngle is defined as 0 90 90 +90 0. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 04:22:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 12124:2001(E) 4 3.21 measurement point point in the ear canal of the test ear at which the sound inlet of the probe microphone is placed See Figure 2. 3.22
45、 test signal type identification of the test signal in terms of its frequency spectrum and/or temporal properties 3.23 concurrent equalization equalization performed at the time of measurement, based on the monitoring of the test signal level NOTEAlternatively it may be referred to as real-time equa
46、lization. 3.24 stored equalization equalization performed at the time of measurement, based on data recorded during a prior measurement of the sound field 3.25 substitution method method of measurement using stored equalization where the reference microphone is located at the subject refer- ence poi
47、nt and the subject is absent during the recording of the sound field data 3.26 modified pressure method method of measurement using stored or concurrent equalization with the field reference point near the surface of the head, close to the test ear but outside the acoustic influence of the pinna and
48、 the hearing aid NOTEThe exact location of the field reference point should be specified by its perpendicular distance from the surface of the head, and its distance (in millimetres) forward of and above or below the centre of the ear canal entrance. 3.27 differential comparison measurement in which
49、 the test signal level is subtracted from the SPL at the measurement point NOTEWhen using broad-band signals, band sound pressure levels should be used. 3.28 real-ear unaided response REUR SPL as a function of frequency at the measurement point for a specified test signal level with the ear canal unoc- cluded 3.29 real-ear unaided gain REUG difference, in decibels, between the SPL at the measurement point and the test signal level, as a function of fre- quency, with the ear canal unoccluded NOTEWhen using broad-band signals, band sound pressure levels should be
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