1、BRITISH STANDARD BS6083-10: 1988 IEC 118-10: 1986 Hearing aids Part10: Guide to hearing aid standards UDC534.77:001.4:006.3/.8BS6083-10:1988 This British Standard, having been prepared under the directionof the Electronic Equipment Standards Committee,was published underthe authority of the BoardofB
2、SI and comes into effecton 29 April1988 BSI09-1999 The following BSI references relate to the work on this standard: Committee reference EEL/24 Draft for comment84/28508DC ISBN 0 580 16452 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by th
3、e Electronic Equipment Standards Committee (EEL/-) to Technical Committee EEL/24, upon which the following bodies were represented: British Coal British Medical Association British Society of Audiology Confederation of British Industry Department of Health and Social Security Department of Trade and
4、 Industry (National Physical Laboratory) Health and Safety Executive Hearing Aid Industry Association Institute of Acoustics Institute of Sound attention is drawn especially to the following. Wherever page numbers are quoted, they refer to IEC page numbers given in brackets at the bottom of each pag
5、e. Cross-references International Standard Corresponding British Standard IEC90:1973 BS2813:1981 Specification for dimensions of plugs for hearing aids (Identical) IEC118 BS6083 Hearing aids IEC118-0:1983 Part0:1984 Methods for measurement of electroacoustical characteristics (Identical) IEC118-1:19
6、83 Part1:1984 Method for measurement of characteristics of hearing aids with induction pick-up coil input (Identical) IEC118-2:1983 Part2:1984 Methods for measurement of electroacoustical characteristics of hearing aids with automatic gain control circuits (Identical) IEC118-3:1983 Part3:1984 Method
7、s for measurement of electroacoustical characteristics of hearing aid equipment not entirely worn on the listener (Technically equivalent) IEC118-4:1981 Part4:1981 Specification for magnetic field strength in audio-frequency induction loops for hearing aid purposes (Technically equivalent) IEC118-5:
8、1983 Part5:1984 Specification for dimensions of the nipple and sealing device for insert earphones (Identical) IEC118-6:1984 Part6:1985 Specification for characteristics of electrical input circuits for hearing aids (Identical) IEC118-7:1983 Part7:1985 Methods for measurement of the performance char
9、acteristics of hearing aids for quality inspection on delivery (Identical) IEC118-8:1983 Part8:1985 Methods for measurement of the performance characteristics of hearing aids under simulated in situ working conditions (Identical)BS6083-10:1988 BSI 09-1999 iii The IEC publication for “Provisional Hea
10、d and Torso Simulator for Acoustic Measurements of Air Conduction Hearing Aids” referred to in3.2.6, is still in preparation. Parts of BS6840 when issued will supersede BS5428 which will be withdrawn. NOTETypographical error. In 3.1.5 “Scope” in line1, “producing and alternating” should be read as “
11、producing an alternating”. 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 immunity from legal obligations. International
12、Standard Corresponding British Standard IEC118-9:1985 Part9:1986 Methods for measurement of characteristics of hearing aids with bone vibrator output (Identical) IEC118-10:1986 Part10:1988 Guide to hearing aid standards (Identical) IEC118-11:1983 Part11:1984 Specification for symbols and other marki
13、ngs on hearing aids and related equipment (Identical) IEC126:1973 BS6111:1981 Specification for reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts (Identical) IEC268 BS5428 Methods for specifying and measuring the characteristics of sound
14、 system equipment (Identical) BS6840 Sound system equipment (Identical) IEC303:1970 BS4668:1971 Specification for an acoustic coupler (IECreference type) for calibration of earphones used in audiometry (Technically equivalent) IEC318:1970 BS4669:1971 Specification for an artificial ear of the wide b
15、and type for the calibration of earphones used in audiometry (Technically equivalent) IEC373:1971 BS4009:1975 Specification for an artificial mastoid for the calibration of bone vibrators used in hearing aids and audiometers (Technically equivalent) IEC711:1981 BS6310:1982 Specification for occluded
16、-ear simulator for the measurement of earphones coupled to the ear by ear inserts (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, pages1to16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may ha
17、ve had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS6083-10:1988 BSI 09-1999 1 Introduction This report is intended as an introduction to and a catalogue of the existing IEC publications on hearing aids. Different types of hearing aid mea
18、surement call for different test methods. There is therefore, a need for guidance to ensure the proper use of the different IEC publications. It is furthermore considered necessary to provide a survey of the existing IEC publications concerning hearing aids and also a glossary of terms defined in th
19、ese publications. 1 Scope and object The object of this report is to provide a guide to appropriate IEC publications related to hearing aids. The report includes a glossary of terms and the scope of each publication. The particular measurement needs are indicated. A method of classifying hearing aid
20、s is given based upon maximum saturation sound pressure level. 2 Glossary of terms This glossary lists all terms for which definitions are given in the IEC Publication118 series. See also Appendix C. The number of the publication containing the definition is stated. 2.1 Acoustic gain (at a specified
21、 frequency and under specified operating conditions) (IECPublication118-0). The difference between the sound pressure level developed in the occluded ear simulator by the hearing aid and the sound pressure level measured at the test point. NOTE 1See also IEC Publication118-7 where constant entrance
22、sound pressure method is used and the occluded-ear simulator is replaced by the IEC reference coupler (IECPublication126). See also Sub-clause3.2.2 of this report. NOTE 2For acoustic couplers mentioned in IEC Publication118-3, reference is made to Sub-clauses3.2.3 and3.2.4 of this report. 2.2 Acoust
23、o-mechanical sensitivity (IECPublication118-9) At a specified frequency and under specified operating conditions, 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. 2.3 Acousto-mechanical sensiti
24、vity level (AMSL) (IEC Publication118-9) Twenty times the logarithm to the base10 of the ratio of the acousto-mechanical sensitivity to the reference sensitivity ofexpressed in decibels. NOTETo calculate the acousto-mechanical sensitivity level (AMSL) from measurements made in this report the follow
25、ing formula may be used: AMSL=(Output force level). OFL expressed in dB (re14N) minus (sound pressure level applied to the hearing aid microphone in dB (re204Pa). AMSL=OFL input SPL. 2.4 Attack time (IEC Publication118-2) The time interval between the moment when the input signal level is increased
26、abruptly by a stated number of decibels and the moment when the output sound pressure from a hearing aid with an AGC circuit stabilizes at the elevated steady-state level within2dB. 2.5 Attack time for the normal dynamic range of speech (IEC Publication118-2) The attack time, when the initial input
27、sound pressure level is55dB and the increase in input sound pressure level is25dB. 2.6 Automatic gain control (AGC) (IECPublication118-2) A means in a hearing aid by which the gain is automatically controlled as a function of the magnitude of the envelope of the input signal or other signal paramete
28、r. 2.7 Axis of rotation of the manikin (IECPublication118-8) A straight line passing through the reference point of the manikin and lying in the plane of symmetry of the manikin, and having a direction that would be vertical if the manikin were mounted in a position corresponding to that of a standi
29、ng person (andabout which the manikin can be rotated). 2.8 Azimuth angle of sound incidence ( ) (IECPublication118-8) The angle between the plane of symmetry of the manikin and the plane defined by the axis of rotation and the test axis. When the manikin faces the sound source the azimuth angle of s
30、ound incidence is defined as0 . When the right ear of the manikin faces the sound source, the azimuth angle is defined as+90 . When the left ear faces the sound source, the angle is defined as+270 . 2.9 Basic force level frequency response curve (IEC Publication118-9) The output force level frequenc
31、y response curve obtained with the gain control in the reference test gain position and with an input SPL of60dB. 2.10 Basic frequency response curve (IECPublication118-0) The frequency response curve obtained at the reference test gain setting with an input sound pressure level of60dB. 1 4N 20 4Pa
32、-BS6083-10:1988 2 BSI 09-1999 2.11 Bone vibrator (IEC Publication118-9) An electromechanical transducer intended to produce the sensation of hearing by vibrating the cranial bones. 2.12 Comparison method (IECPublication118-0) A method of measurement in which the hearing aid and the microphone employ
33、ed to measure the free-field sound pressure are placed simultaneously at two acoustically equivalent points in the sound field. 2.13 Comprehensive frequency response curves (IEC Publication118-0) A family of frequency response curves obtained with the gain control in the reference test gain position
34、 using a series of input sound pressure levels to exhibit the input-output characteristics of the hearing aid over its full range of operation. 2.14 Compression ratio (between specified input sound pressure level values) (IECPublication118-2) Under steady-state conditions, the ratio of an input soun
35、d pressure level difference to the corresponding output sound pressure level difference, both expressed in decibels. 2.15 Dynamic output characteristics (IECPublication118-2) The output sound pressure envelope shown as a function of time when an input sound signal of a predetermined frequency and le
36、vel is modulated by a square envelope pulse with a predetermined pulse amplitude. 2.16 Ear canal extension (IEC Publication118-8) A device which connects the concha portion of the pinna simulator with the outer (reference plane) face of the occluded ear simulator, simulating the outer part of the ea
37、r canal excluding the pinna. 2.17 Ear insert simulator (IECPublication118-8) A device used to provide the acoustic coupling between an earphone and the ear canal (e.g.anear-mould or a similar device without a connecting tube). 2.18 Ear simulator (IEC Publications118-0,118-8 and711) An ear simulator
38、is a device for measuring the output sound pressure of an earphone under well defined loading conditions in a specified frequency range. It consists essentially of a principal cavity, acoustic load networks, and a calibrated microphone. The location of the microphone is chosen so that the sound pres
39、sure at the microphone corresponds approximately to the sound pressure existing at the human eardrum. 2.19 Elevation angle of sound incidence ( ) (IEC Publication118-8) The angle between the reference plane of the manikin and the test axis. When the vertex points towards the sound source, the elevat
40、ion angle is defined as+90 . When the test axis lies in the reference plane, the elevation angle is defined as0 . 2.20 Frequency response (IECPublication118-0) The sound pressure level developed in the ear simulator by the hearing aid expressed as a function of frequency under specified test conditi
41、ons. NOTESee Notes1 and2 of Sub-clause2.1. 2.21 Full-on acoustic gain (IECPublication118-0) At a specified frequency or as a function of frequency. The acoustic gain under essentially linear input/output conditions obtained from the hearing aid measured with the gain control at maximum (full on) and
42、 at stated settings of the other hearing aid controls. See also IEC Publication118-7. 2.22 Full-on simulated insertion gain (IECPublication118-8) The SIG obtainable from a hearing aid with the gain control at maximum (full on) and at stated settings of the other hearing aid controls. 2.23 High level
43、 attack time (IEC Publication118-2) The attack time, when the initial input sound pressure level is60dB and the increase in input sound pressure level is40dB. 2.24 High level recovery time (IECPublication118-2) The recovery time, when the initial sound pressure level is100dB and the decrease in inpu
44、t sound pressure level is40dB. 2.25 Lower AGC limit or AGC threshold (IECPublication118-2) The input sound pressure level which, when applied to the hearing aid, gives a reduction in the gain of2 0.5dB with respect to the gain in the linear mode. 2.26 Manikin (head and torso simulator) (IECPublication118-8) A head and torso simulator extending downward from the top of the head to the waist and designed to simulate the acoustic diffraction produced by a median adult human head and torso. The head includes two pinna simulators, and contains at least one occluded-ear simulator.
