1、STD-BSI BS EN IS0 347-L-ENGL 2000 Lb24669 0442b46 826 BRITISH STANDARD Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones The European Stanard EN IS0 39-1:2000 has the status
2、of a British standard CS 17.140.M) BS EN IS0 389-1:2000 NO COPYING WITIIOUT BSI PERMISSION EXCEPT AS PERMlTED BY COPYRIGHT LAW STD-BSI BS EN IS0 389-L-ENGL 2000 Lb24bb9 0842697 762 been prepared under the direction of the Health and AmdNo. Date Environment Sector Committee, was published under the a
3、uthority of the Standards Committee and comes into effect on 15 May ZOO0 Q BSI 06-2000 ISBN O 680 34608 O BS EN IS0 389-1:2000 National foreword Comments This British Standard is the English language version of EN IS0 389-1:2000. It is identical with IS0 389-1: 1998. It supersedes BS EN IS0 389 1997
4、 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EWl, Acoustics, which has the responsibility to: - aid enquirers to understand the te* - present to the responsible internationaVEuropean committee any enquiries on the interpreaon, or prop b) the const
5、ruction and material shall be suitable for providing a good acoustical seal between the earphone (or its cushion) and the human ear; c) when placed in contact with a plane surface, the circle of contact of the earphone (or its cushion) shall be of a diameter comparable with the sagittal dimensions o
6、f the human pinna; d) no part of the earphone (or its cushion) shall protrude beyond the plane of contact given in c), and the recess shall be approximately in the form of a truncated cone; e) the contour of the earphone, or its cushion if provided, shall be such that contact with an artificial ear
7、of the type specified in IEC 60318 is effective only at a diameter of 25 mm; NOTE 1 a diameter exceeding 25 mm will be greater than 1 16“. This requirement means that the angle at the vertex of any cone which is tangential to the earphone contour on f) the material of the cushion, if provided, shall
8、 not be so soft as to cause significant deformation when the earphone is applied to an artificial ear as determined by the following test: when a static force of 5 N is changed to 10 N, the apparent sensitivity level at 1 kHz shall not change by more than 0,2 dB; g) the contour of the earphone, or i
9、ts cushion if provided, shall be such that, when placed on the human ear, contad is made with the pinna and not with the cranial tissue posterior to the pinna; NOTE 2 This requirement excludes earphones of the circumaural type. h) a headband shall be provided to hold the earphone on the human pinna
10、with a static force of 4,5 N f 0,5 N. The RETSPL values apply when the earphone is coupled to the artificial ear under the following conditions: a) the earphone and artificial ear are coaxial and the axis is vertical; b) without acoustic leakage; c) with nominal static force of 4,5 N f 0,5 N, not in
11、cluding the weight of the earphone itself. 4 STD-BSI BS EN IS0 3S-1-ENGL 2000 O Lb24bb9 0842709 204 I EN IS0 389-12000 Table 2 - Reference equivalent threshold sound pressure levels in an artificial ear complying with IEC 60318 Frequency HZ 125 160 200 250 31 5 400 500 630 750 800 1 O00 I 250 1 500
12、1 600 2 O00 2 500 3 O00 3 150 4 O00 5 O00 6 O00 6 300 8 O00 RETSPL (Reference: 20 pPa) dB 45 38,5 32,5 27 22 17 13,5 10,5 9 83 7,5 7,5 7,5 8 9 10,5 11,5 11,5 12 11 16 21 15.5 NOTE Values are rounded to the nearest half decibel. 5 STD-BSI BS EN IS0 389-3-ENGL 2000 3624669 0842730 T2b EN IS0 389-1:200
13、0 Annex A (informative) Notes on the derivation and application of the recommended reference levels A.l Derivation A.l.l General It is very important to note that the RETSPLs given in Table 1 and Table 2 refer, as closely as can be ascertained from existing data, to the same hearing threshold levels
14、. The differences between the values are mainly due to differences between the acoustical properties of the acoustic coupler and those of the artificial ear. A.1.2 Octave frequencies and additional audiometric frequencies 1 500 Hz, 3 O00 Hz and 6 O00 Hz The RETSPLs given in Table 1 for the Beyer DT
15、48 earphone correspond to an average of 15 determinations published, or otherwise communicated to the International Organization of Standardization, during the period from 1950 to 1961. The values have been determined by a cooperative investigation carried out by the following five standardizing lab
16、oratories: Centre National dctudes des Tlcommunications, Palaiseau, France; Physikalisch-Technische Bundesanstalt, Braunschweig, Germany; National Physical Laboratoty, Teddington, United Kingdom; National Bureau of Standards, Washington DC, USA; V.N.I.I.M. Laboratoty, Leningrad, USSR. The RETSPLs gi
17、ven in Table 1 for the Telephonics TDH 39 earphone were derived at a later date by subjective loudness balancing methods. For details, see references 2 to 5 in the Bibliography. The RETSPL values given in Table 2 were obtained by averaging the results of transfer measurements on several examples of
18、six models of earphone. These measurements, carried out by the laboratories mentioned below, compared the sound pressure level developed in the acoustic coupler (see IEC 60303) and the IEC artificial ear (see IEC 60318) for equal electrical excitation of the earphones. The participating laboratories
19、 were Audiologiske Institutt, Rikshospitalet, Oslo, Norway; Karolinska Institutet, Stockholm, Sweden; National Bureau of Standards, Washington DC, USA; National Physical Laboratory, Teddington, United Kingdom; Physikalisch-Technische Bundesanstalt, Braunschweig, Germany. For details, see reference 6
20、. 6 STD-BSI BS EN IS0 389-1-ENGL 2000 Lb24bb9 0842711 962 EN IS0 389-1:2000 A.1.3 Supplementary frequencies The RETSPL values for supplementary frequencies have been derived by interpolation from those values specified for octave frequencies and the additional audiometric frequencies 1 500 Hz, 3 O00
21、 Hz and 6 O00 Hz and supported by some experimental data. In the frequency range from 125 Hz to 1 O00 Hz, the interpolation was based on the assumption of a third-order polynomial relation between reference level in decibels and Ism. In the range from 1 O00 Hz to 8 O00 Hz, linear interpolation was u
22、sed for Table 1. For Table 2, linear interpolation was used in the range from 1 O00 Hz to 4 O00 Hz. Above this range, the data are based on experimental evidence. NOTE Experimental data were submitted to IS0 by the following laboratories: Health and Welfare, Ottawa, Canada; Physikalisch-Technische B
23、undesanstalt, Braunschweig, Germany; Regionsjukhuset, Linkping, Sweden; Technical University, Lyngby, Denmark. For details, see references 7 to lo. A.2 Application A.2.1 As regards the calibration of audiometers which are fitted with earphones of one the models mentioned in Table 1 or specified in 4
24、.3, measurements of the acoustical output, using the specified type of coupler or artificial ear, suffice to calibrate the audiometer in terms of the recommended RETSPLs given in the appropriate table. When the earphone is applied to the human ear, the headband used should provide a nominal static f
25、orce of 4,5 N IO,5 N. NOTE A headband providing a force of 4,5 N for a mean head width of 145 mm will usually comply with this tolerance for adult test populations. A.2.2 In the case of audiometers fitted with earphones of models neither mentioned in Table 1 nor specified in 4.3, it is necessary fir
26、st to determine the corresponding RETSPLs for this model of earphone. This would normally be done by comparing the earphone subjectively with an earphone of one of the models considered in clause 4, using a suitable ”equal-loudness balance” or ”threshold balance” technique. In certain cases, the res
27、ults of such comparisons may already be available. For details of the technical procedures and facilities for such work, reference should be made to the manufacturer or direct to the appropriate standardizing laboratory. 7 STD-BSI BS EN IS0 389-3-ENGL 2000 M 3b24bb9 0842732 8T9 - EN IS0 389-1:2000 B
28、ibliography 31 41 151 161 171 i81 i1 31 11 41 i 51 MRASS, H. and DIESTEL, H.G. Acoustica, 9,1959, pp. 61-64. WEISSLER, P.G. International Standard Reference Zero for Audiometers, J. Acoust. Soc. Amer., 44, 1968, pp. 264-275. Cox, Jr., J.R. and BILGER, R.C. Suggestion Relative to the Standardization
29、of Loudness-Balance Data for the Telephonics TDH-39 Earphone, J. Acoust. Soc. Amer., 32, 1960, pp. 1081 -1 082. WHITTLE, L.S. and DELANY, M.E. Equivalent Threshold Sound-Pressure Levels for the TDH-39/MX41 -AR Earphone, J. Acoust. Soc. Amer., 39, 1966, pp. 1187-1188. MICHAEL, P.L. and BIENVENUE, G.R
30、. A comparison of acoustical performance between a new one-piece earphone cushion and the conventional two-piece MX-41/AR cushion, J, Acoust, Soc, Amer., 67(2), 1980, ROBINSON, D.W. A proposal for Audiometric zero referred to the lEC artificial ear, UK National Physical Laboratory, Acoustics Report
31、Ac 85 (1978). ARLINGER, S. Normal thresholds of hearing at preferred frequencies, Scand. Audio/., 11, 1982, pp. 285-286. pp. 693-698. RASMUSSEN, O. Reference equivalent threshold sound pressure levels for headphones at one-third octave standard frequencies, Internal Report No. 14, 1981, The Acoustic
32、s Laboratory, Technical University of Denmark, Lyngby. BRINKMANN, K. and RICHTER, U. Determination of the normal threshold of hearing by bone conduction using different types of bone vibrators, Audiological Acoustics, 22, 1983, pp. 62-85 and 1 14-1 22. BENWELL, D.A. and HUSSEY, R.G. Reference equiva
33、lent threshold sound pressure levels at 5 and 6.3 kHz using Telephonics TDH 39 earphones with MX-41/AR cushions, J. Acoust. Soc. Amer., 72, 1982, Supplement 1, p. S. 109. IS0 266: 1 997, Acoustics - Preferred frequencies. IS0 61 89:1983, Acoustics - Pure tone air conduction threshold audiomety for h
34、earing conservation purposes. IS0 7029:1984, Acoustics - Statistical distribution of hearing thresholds as a function of age and sex for otologically nomal persons. IS0 7566:1987, Acoustics - Standard reference zero for the calibration of pure-tone bone conduction audiometers. IS0 8253- 1 :1989, Aco
35、ustics - Audiometric test methods - Part 1: Basic pure tone air and bone conduction threshold audiometry. 8 BS EN IS0 389- 1 :2000 BSI 389ChiswickHighRoad London w4 4AL STD=BSI BS EN IS0 389-L-ENGL 2000 I Lb24bb9 0842733 735 BSI - British Standards Institution BSI is the independent nationai body re
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