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1、BRITISH STANDARD BS 6083-9: 1986 IEC 118-9: 1985 Incorporating Amendment No. 1 Hearing aids Part 9: Methods for measurement of characteristics of hearing aids with bone vibrator output (Implementation of CENELEC HD 450.9 S1) UDC 616.28-76:534.773.08 Licensed Copy: sheffieldun sheffieldun, na, Tue De
2、c 05 04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-9:1986 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 November 1986 BSI 10-1999 The fol
3、lowing BSI references relate to the work on this standard: Committee reference EEL/24 Draft for comment 82/32765 DC ISBN 0 580 15485 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Committee (EEL/-) to Te
4、chnical Committee EEL/24, upon which the following bodies were represented: British Medical Association British Society of Audiology British Telecommunications plc Confederation of British Industry Department of Health and Social Security Department of Trade and Industry (National Physical Laborator
5、y) Health and Safety Executive Hearing Aid Industry Association Institute of Acoustics Institute of Sound and Vibration Research Institution of Electronic and Radio Engineers Medical Research Council National Coal Board National Health Service Royal Aeronautical Society Royal National Institute for
6、the Deaf Society of Hearing Aid Audiologists Limited Amendments issued since publication Amd. No.Date of issueComments 6186October 1990Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-9:1986 BSI 1
7、0-1999i Contents Page Committees responsibleInside front cover National forewordii Introduction1 1Scope1 2Object1 3General1 4Explanation of terms1 5Test equipment2 6Test conditions3 7Measurements4 8Frequency response recording chart5 Appendix A Examples of test assemblies6 Figure A.1 An example of a
8、 hearing aid with an integral bone vibrator under test6 Figure A.2 An example of a bone vibrator with headband mounted on the mechanical coupler6 Figure A.3 An example of a spectacle hearing aid with an integral bone vibrator under test and spectacle arm attached to hinge7 Figure A.4 An example of a
9、 bone vibrator with headband mounted on the mechanical coupler and amplifier with microphone permanently attached to the headband7 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-9:1986 ii BS
10、I 10-1999 National foreword This Part of BS 6083 has been prepared under the direction of the Electronic Equipment Standards Committee and is identical with IEC Publication 118-9:1985 “Hearing aids Part 9: Methods of measurement of characteristics of hearing aids with bone vibrator output”, publishe
11、d by the International Electrotechnical Commission (IEC). This standard is also in agreement with Harmonization Document HD 450.9 S1 published by the European Committee for Electrotechnical Standardization (CENELEC). BS 6083 consists of the following Parts: Part 0:1984: Methods for measurement of el
12、ectroacoustical characteristics; Part 1:1984: Method for measurement of characteristics of hearing aids with induction pick-up coil input; Part 2:1984: Methods for measurement of electroacoustical characteristics of hearing aids with automatic gain control circuits; Part 3:1984: Methods for measurem
13、ent of electroacoustical characteristics of hearing aid equipment not entirely worn on the listener; Part 4:1981: Specification for magnetic field strength in audio-frequency induction loops for hearing aid purposes; Part 5:1984: Specification for dimensions of the nipple and sealing device for inse
14、rt earphones; Part 6:1985: Specification for characteristics of electrical input circuits for hearing aids; Part 7:1985: Methods for measurement of the performance characteristics of hearing aids for quality inspection on delivery; Part 8:1985: Methods for measurement of the performance characterist
15、ics of hearing aids under simulated in situ working conditions; Part 9:1986: Methods for measurement of characteristics of hearing aids with bone vibrator outputs; Part 10: Guide to hearing aid standards; Part 11:1984: Specification for symbols and other markings on hearing aids and related equipmen
16、t. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards. Textual error. When adopting the text of the
17、International Standard, the textual error given below was discovered. It has been marked in the text and has been reported to the IEC in a proposal to amend the text of the International Standard. In the introduction, in line 2 of paragraph 5, for “(e.g. a headband type bone conduction hearing aid)”
18、 read “(e.g. a spectacle type bone conduction hearing aid)”. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-9:1986 BSI 10-1999iii A British Standard does not purport to include all the necessary provisions of a contract. Users of Br
19、itish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardsCorresponding British Standards IEC 68BS 2011 Basic environmental testing procedures (Most Parts are id
20、entical or technically equivalent to the corresponding IEC Parts) BS 6083 Hearing aids IEC 118-0:1983Part 0:1984 Methods for measurement of electroacoustical characteristics (Identical) IEC 118-1:1983Part 1:1984 Method for measurement of characteristics of hearing aids with induction pick-up coil in
21、put (Identical) IEC 118-7:1983Part 7:1985 Methods for measurement of the performance characteristics of hearing aids for quality inspection on delivery (Identical) IEC 263:1982BS 6397:1983 Specification for scales and sizes for plotting frequency characteristics and polar diagrams (Identical) IEC 37
22、3:1971BS 4009:1975 Specification for an artificial mastoid for the calibration of bone vibrators used in hearing aids and audiometers (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 8, an inside back cover and a back c
23、over. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Co
24、py: sheffieldun sheffieldun, na, Tue Dec 05 04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-9:1986 BSI 10-19991 Introduction IEC Publication 118-0: Hearing Aids, Part 0: Measurement of Electroacoustical Characteristics, gives information on methods of test for air conduction hearing aids
25、. The majority of hearing aids in use are of this type but a small percentage use a bone vibrator instead of an earphone. The use of a bone vibrator requires a different method of measuring the output from the hearing aid and also makes it impractical to measure amplification directly in terms of ac
26、oustic gain. Amplification in the case of an air conduction hearing aid is expressed as the difference between the output sound pressure level in an acoustic coupler or ear simulator and the input sound pressure level measured in a specified manner. However, with bone conduction hearing aids the inp
27、ut is in terms of sound pressure level but the output will be in terms of mechanical vibration measured as an alternating force or force level. This standard defines a method of expressing the input/output ratio as an acousto-mechanical sensitivity level measured on a mechanical coupler according to
28、 the second edition of IEC Publication 373: Mechanical Coupler for Measurements on Bone Vibrators. By means of information provided in this standard the performance of hearing aids with bone vibrator outputs which do not form an integral part of the hearing aid for example body worn hearing aids, ma
29、y be measured in a similar manner to aids with air conduction outputs as described in IEC Publication 118-0. Where the bone vibrator forms an integral part of the hearing aid, or where it is attached in some fixed manner to the hearing aid (e.g. a headband type bone conduction hearing aid)1). perfor
30、mance cannot be measured in the same way as for body-worn aids, due to the large dimensions of the mechanical coupler having to be in contact with the spectacle arm. This standard recommends a pressure method of controlling the input sound pressure level, to the hearing aid microphone. The second ed
31、ition of IEC Publication 373, describes the means of measuring the output from a bone vibrator. 1 Scope This standard specifies methods of measurement of the characteristics of hearing aids using bone vibrator output. 2 Object The methods described will produce a suitable basis for the exchange of i
32、nformation or for direct comparison of the electroacoustical characteristics of hearing aids using bone vibrator output. These methods are chosen to be practical and reproducible and are based on selected fixed parameters. The results obtained by the methods specified herein express the performance
33、under the conditions of the test, but will not necessarily agree exactly with the performance of the hearing aid under practical conditions of use. 3 General 3.1 Throughout this standard all sound pressure levels specified are referred to 20 4Pa. When appropriate, sound pressure level will be abbrev
34、iated to SPL. 3.2 In this standard, reference is made to the following IEC publications: 4 Explanation of terms Terms other than those used in IEC Publication 118-0 are given below. 4.1 Bone vibrator An electromechanical transducer intended to produce the sensation of hearing by vibrating the crania
35、l bones. 1) See national foreword for details of textual error. Publication 68:Basic Environmental Testing Procedures. Publication 118-0 (1983):Hearing Aids, Part 0: Measurement of Electroacoustical Characteristics. Publication 118-7 (1983):Hearing Aids, Part 7: Measurement of the Performance Charac
36、teristics of Hearing Aids for Quality Inspection for Delivery Purposes. Publication 263 (1982):Scales and Sizes for Plotting Frequency Characteristics and Polar Diagrams. Publication 373 ():Mechanical Coupler for Measurements on Bone Vibrators. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05
37、04:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-9:1986 2 BSI 10-1999 4.2 Mechanical coupler A device designed to present a specified mechanical impedance to a vibrator applied with a specified static force and equipped with a mechano-electric transducer to enable the alternating force le
38、vel at the surface of contact between vibrator and mechanical coupler to be determined. 4.3 Vibratory force level (force level) Twenty times the logarithm to the base 10 of the ratio of the r.m.s. value of the force transmitting the vibration to the reference value of 1 micronewton (1 4N), expressed
39、 in decibels. 4.4 Output force level (OFL) The vibratory force level produced at a specified frequency on a mechanical coupler by the bone vibrator of the hearing aid under test. 4.5 Output force level frequency response (force level curve) The OFL produced on the mechanical coupler by the hearing a
40、id expressed as a function of frequency under specified test conditions for constant input sound pressure level. 4.6 Output force level for an input sound pressure level of 90 dB (OFL90) The OFL at a specified frequency produced with an input sound pressure level of 90 dB and the hearing aid gain co
41、ntrol in the full-on position. 4.7 Reference point (of a hearing aid) A point on the hearing aid chosen for the purpose of defining its position, normally the centre of the main sound entry to the aid. 4.8 Acousto-mechanical sensitivity At a specified frequency and under specified operating conditio
42、ns the quotient of the vibratory force produced on the mechanical coupler by the hearing aid and the sound pressure at the reference point of the hearing aid. 4.9 Acousto-mechanical sensitivity level (AMSL) Twenty times the logarithm to the base 10 of the ratio of the acousto-mechanical sensitivity
43、to the reference sensitivity of ; expressed in decibels. NOTETo calculate the acousto-mechanical sensitivity level (AMSL) from measurements made in this standard the following formula may be used: AMSL = OFL INPUT SPL where OFL is expressed in decibels ref. 1 4N and sound pressure level to the heari
44、ng aid microphone in decibels ref. 20 4Pa. 4.10 Reference test gain control position The setting of the hearing aid gain control that provides an output force level on the mechanical coupler 15 1 dB less than OFL90 for an input sound pressure level of 60 dB at the reference test frequency of 1 600 H
45、z. For certain hearing aids for which a higher reference test frequency is more appropriate (so called high-tone hearing aids) 2 500 Hz shall be used. If 2 500 Hz is used this shall be clearly stated. If the acousto-mechanical sensitivity level available will not permit this, the full on gain contro
46、l position of the hearing aid shall be used. 4.11 Basic force level frequency response curve The output force level frequency response curve obtained with the gain control in the reference test gain position and with an input SPL of 60 dB. 5 Test equipment 5.1 Equipment for the measurement of the ou
47、tput force level The equipment used for measurement of OFL on the mechanical coupler produced by the hearing aid, shall comply with the following requirements: 5.1.1 For all measurements a mechanical coupler in accordance with the second edition of IEC Publication 373 shall be used. 5.1.2 The output
48、 force level corresponding to hum, vibration, thermal agitation and other noise sources shall be sufficiently low to ensure that the reading shall drop at least 10 dB when the test signal is switched off. For this purpose a high-pass filter not affecting frequencies of 200 Hz and above may be employ
49、ed. 5.1.3 The output indicator used shall give the r.m.s. indication within a tolerance of 0.5 dB at a signal crest factor of not more than 3. NOTE 1Under certain conditions it is necessary to use a selective measuring system in order to ensure that the response of the hearing aid to the signal can be differentiated from inherent noise in the hearing aid. The use of the selective system should be stated in the report on test results. NOTE 2It is well known that the type of output indicator employed may influence the test results signific