1、BSI Standards PublicationBS EN ISO 389-3:2016Acoustics Reference zero forthe calibration of audiometricequipmentPart 3: Reference equivalent thresholdvibratory force levels for pure tones andbone vibratorsBS EN ISO 389-3:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implement
2、ation of EN ISO 389-3:2016.It supersedes BS EN ISO 389-3:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/1, Hearing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purp
3、ort to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 82086 1ICS 11.040.01; 13.140Compliance with a British Standard cannot confer immunity fromlegal obl
4、igations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN ISO 389-3 February 2016 ICS 13.140 Supersedes EN ISO
5、389-3:1998English Version Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators (ISO 389-3:2016) Acoustique - Zro de rfrence pour ltalonnage dquipements audiomtriques - Partie 3: Nivea
6、ux de rfrence quivalents de force vibratoire liminaire pour les vibrateurs sons purs et les ossivibrateurs (ISO 389-3:2016) Akustik - Standard-Bezugspegel fr die Kalibrierung audiometrischer Gerte - Teil 3: quivalente Bezugs-Schwellenkraftpegel fr reine Tne und Knochenleitungshrer (ISO 389-3:2016) T
7、his European Standard was approved by CEN on 2 January 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical refer
8、ences concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN
9、 member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia
10、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISC
11、HES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 389-3:2016 EBS EN ISO 389-3:2016EN ISO 389-3:2016 (E) 3 European foreword This documen
12、t (EN ISO 389-3:2016) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identica
13、l text or by endorsement, at the latest by August 2016, and conflicting national standards shall be withdrawn at the latest by August 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held respo
14、nsible for identifying any or all such patent rights. This document supersedes EN ISO 389-3:1998. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyp
15、rus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the Unite
16、d Kingdom. Endorsement notice The text of ISO 389-3:2016 has been approved by CEN as EN ISO 389-3:2016 without any modification. BS EN ISO 389-3:2016ISO 389-3:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Reference equivalent threshold vibratory forc
17、e levels (RETVFL) 35 Test conditions and requirements . 45.1 General . 45.2 Bone vibrator 45.3 Fitting of the bone vibrator 45.4 Mechanical coupler . 55.5 Test signal 55.6 Masking noise 55.7 Masking transducer 55.8 Fitting of masking transducer 55.9 Baseline masking level . 6Annex A (informative) No
18、te on the derivation of RETVFL values . 7Annex B (informative) Guidance on the application of the reference zero to the calibration of bone-conduction audiometers 8Annex C (informative) Differences in reference equivalent threshold vibratory force levels between forehead and mastoid location of vibr
19、ator .10Annex D (informative) Bone-conduction threshold of hearing for frequencies below 250 Hz 12Bibliography .13 ISO 2016 All rights reserved iiiContents PageBS EN ISO 389-3:2016ISO 389-3:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national
20、standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. 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
21、 organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for
22、 its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org
23、/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be i
24、n the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions re
25、lated to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 43, Acoustics.This second edition cancels and re
26、places the first edition (ISO 389-3:1994), which has been technically revised. It also incorporates the Technical Corrigendum ISO 389-3:1994/Cor 1:1995.ISO 389 consists of the following parts, under the general title Acoustics Reference zero for the calibration of audiometric equipment: Part 1: Refe
27、rence equivalent threshold sound pressure levels for pure tones and supra-aural earphones Part 2: Reference equivalent threshold sound pressure levels for pure tones and insert earphones Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators Part 4: Reference
28、 levels for narrow-band masking noise Part 5: Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz Part 6: Reference threshold of hearing for test signals of short duration Part 7: Reference threshold of hearing under free-field and diffuse-field
29、 listening conditions Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones Part 9: Preferred test conditions for the determination of reference hearing threshold levelsiv ISO 2016 All rights reservedBS EN ISO 389-3:2016ISO 389-3:2016(E)IntroductionEac
30、h part of ISO 389 specifies a specific reference zero for the calibration of audiometric equipment. ISO 389-1, ISO 389-2 and ISO 389-8 are applicable to audiometric equipment for the transmission of pure tones by air conduction.For clinical diagnostic and other audiometric purposes, it is often nece
31、ssary to compare the measured hearing threshold levels of a person for sound transmitted to the inner ear by the air-conduction and bone-conduction pathways, respectively. Bone-conducted sound is provided for this purpose by an electromechanical vibrator applied to the mastoid prominence or to the f
32、orehead of the person under test.The reference zero for the calibration of audiometric equipment for air conduction is defined in ISO 389-1, ISO 389-2 and ISO 389-8 in terms of reference equivalent threshold sound pressure levels (RETSPL), i.e. threshold sound pressure levels produced in an ear simu
33、lator or acoustic coupler of specified characteristics by supra-aural, circumaural or insert earphones of various patterns, when excited electrically at a level corresponding to the threshold of hearing of young otologically normal persons. Similarly, this part of ISO 389 provides a reference zero f
34、or bone-conduction audiometry in terms of reference equivalent threshold vibratory force levels (RETVFL), i.e. the vibratory force levels produced by a bone vibrator on a specified mechanical coupler when the vibrator is excited electrically at a level corresponding to the threshold of hearing of yo
35、ung otologically normal persons. In some countries, the preferred location is the mastoid prominence; in other countries, the forehead location is used in addition to the mastoid prominence. Different RETVFL values are valid for each of the two positions (see Annex C).For bone-conduction measurement
36、s, it is necessary to specify the static force of application of the vibrator to the test subject and to the mechanical coupler, as well as certain geometrical features of the vibrator tip. In addition, it is usually necessary to apply masking noise to the ear not under test, since excitation of the
37、 cranial bones by the vibrator may be heard by that ear instead of (or in addition to) the ear intended for the test. An appropriate specification of the masking noise is, therefore, required as an adjunct to the reference equivalent threshold vibratory force levels, and such a specification is give
38、n in this part of ISO 389. Due to the so-called “occlusion effect” whereby the wearing of the transducer needed to provide the (air-conducted) masking noise causes a lowering of the bone-conduction threshold of hearing of the ear receiving the masking signal, it is necessary for the level of masking
39、 noise to be raised to cancel out the occlusion effect and provide adequate masking of the ear not under test. The specification of masking noise given in this part of ISO 389 is based on the procedures used in the experimental investigations from which the reference zero of this part of ISO 389 is
40、derived.Use of this reference zero to calibrate audiometers will ensure that measured bone-conduction hearing threshold levels of persons with unimpaired hearing or with hearing losses of purely sensorineural type (i.e. having unimpaired outer and middle ear function) will be compatible with the air
41、-conduction hearing threshold levels of the same persons when using the reference zero of ISO 389-1, ISO 389-2 or ISO 389-8, respectively. Although exact equivalence of air-conduction and bone-conduction thresholds for any individual in these classes cannot be expected, due to biological variability
42、 of sound transmission through the external and middle ear and through the cranial bones, this part of ISO 389 will ensure that systematic deviations averaged over groups of such persons are reduced to a practical minimum.This part of ISO 389 is based on an assessment of technical data provided by l
43、aboratories in three countries using methods of threshold testing which, in the respects described, were essentially uniform. Examination of the data showed that the experimental results were consistent. It has, therefore, been possible to standardize a reference zero by means of RETVFL values which
44、 are to be used for all bone vibrators used in audiometry having similar characteristics to those used by the laboratories. The systematic uncertainties introduced by this deliberate simplification will be small in comparison to the usual step size of hearing level controls in clinical audiometers (
45、5 dB). ISO 2016 All rights reserved vBS EN ISO 389-3:2016BS EN ISO 389-3:2016Acoustics Reference zero for the calibration of audiometric equipment Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators1 ScopeThis part of ISO 389 specifies the following data a
46、pplicable to the calibration of bone vibrators for pure-tone bone-conduction audiometry:a) reference equivalent threshold vibratory force levels (RETVFL), corresponding to the threshold ofhearing of young otologically normal persons by bone-conduction audiometry;b) essential characteristics of the b
47、one vibrator and the method of coupling to the test subject, and tothe mechanical coupler;c) essential characteristics of the masking noise and the baseline masking noise level applied to theear not under test.Guidance on the practical application of this part of ISO 389 in the calibration of audiom
48、eters is given in Annex B.RETVFL is the vibratory force level transmitted to a mechanical coupler of specified characteristics by a vibrator when applied to the mechanical coupler under stated conditions of test and when energized at the voltage level corresponding to the normal threshold of hearing
49、 for location on the mastoid prominence.NOTE 1 Values for the differences in reference equivalent threshold vibratory force levels between location on the forehead and mastoid are included for information in Annex C.NOTE 2 Recommended procedures for carrying out bone-conduction audiometry are specified in ISO 8253-1.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated refe
