BS EN ISO 389-8-2004 Acoustics - Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones and circumaural e.pdf

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1、BRITISH STANDARD BS EN ISO 389-8:2004 Acoustics Reference zero for the calibration of audiometric equipment Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones The European Standard EN ISO 389-8:2004 has the status of a British Standard ICS 13.140 BS

2、 EN ISO 389-8:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 June 2004 BSI 8 June 2004 ISBN 0 580 43854 6 National foreword This British Standard is the official English language version of EN ISO 389-8:2004. It is identical with ISO

3、389-8:2004. The UK participation in its preparation was entrusted to Technical Committee EH/1, Acoustics, to Subcommittee EH/1/1, Hearing, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The Briti

4、sh Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Onli

5、ne. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsib

6、le 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 them in the UK. Summary of pages This document comprises a front cover, an inside front cover,

7、the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENN

8、E EUROPISCHENORM ENISO3898 May2004 ICS13.140 Englishversion AcousticsReferencezeroforthecalibrationofaudiometric equipmentPart8:Referenceequivalentthresholdsound pressurelevelsforpuretonesandcircumauralearphones(ISO 3898:2004) AcoustiqueZroderfrencepourltalonnage dquipementsaudiomtriquesPartie8:Nive

9、auxde rfrencequivalentsdepressionacoustiqueliminairepour lescouteurssonspurscircumauraux(ISO3898:2004) AkustikBezugpegelfrdieAudiometrieTeil8:Bezugs SchwellenSchalldruckpegelfrReintneundcircumaurale Kopfhrer(ISO3898:2004) ThisEuropeanStandardwasapprovedbyCENon16April2004. CENmembersareboundtocomplyw

10、iththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStan

11、dardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRe

12、public,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRN

13、ORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO3898:2004:E I NESO 83-9:802( 40E) 2 Foreword This document (EN ISO 389-8:2004) has been prepared by Technical Committee ISO/TC 43 “Acoustics

14、“ in collaboration with Technical Committee CEN/TC 211 “Acoustics“, the secretariat of which is held by DS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2004, and conflicting national

15、standards shall be withdrawn at the latest by November 2004. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

16、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 389-8:2004 has been approved by CEN as EN ISO 389-8:2004 without any m

17、odifications. ENISO3898:2004 Reference number ISO 389-8:2004(E) OSI 4002INTERNATIONAL STANDARD ISO 389-8 First edition 2004-05-15 Acoustics Reference zero for the calibration of audiometric equipment Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphone

18、s Acoustique Zro de rfrence pour ltalonnage dquipements audiomtriques Partie 8: Niveaux de rfrence quivalents de pression acoustique liminaire pour les couteurs sons purs circumauraux ENISO3898:2004IS-983 O8:(4002E) DPlcsid Fremia ihTs PDF file may ctnoian emdebt dedyfepcaes. In ccaocnadrw eith Aebo

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23、4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.o gr We bwww.is.o gro Pulbisdehi n Switlrez dnaii ISO 4002 Allr ithgsr esedevrENISO3898:2004IS-983 O8:(4002E) I SO 4002 All irthgs ersedevr iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of n

24、ational 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. Inter

25、national 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. International Standards are drafted in accordance with the

26、 rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by

27、 at least 75 % of the member bodies casting a vote. 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. ISO 389-8 was prepared by Technical Committee ISO

28、/TC 43, Acoustics. ISO 389 consists of the following parts, under the general title Acoustics Reference zero for the calibration of audiometric equipment: Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones Part 2: Reference equivalent threshold soun

29、d pressure levels for pure tones and insert earphones Part 3: Reference equivalent threshold force levels for pure tones and bone vibrators Part 4: Reference levels for narrow-band masking noise Part 5: Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz

30、to 16 kHz Part 6: Reference equivalent threshold sound pressure levels for acoustic test signals of short duration Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaura

31、l earphones Part 9 on preferred test conditions for the standardization of reference equivalent threshold sound pressure levels or vibratory force levels, is under preparation. ENISO3898:2004IS-983 O8:(4002E) iv I SO 4002 All irthgs ersedevrIntroduction This part of ISO 389 has been established in o

32、rder to be able to use the same earphone for pure tone audiometry in the frequency range 125 Hz to 16 000 Hz. It specifies reference values from 125 Hz to 8 000 Hz. ISO/TR 389-5 specifies values from 8 000 Hz to 16 000 Hz. The reference values are based on information provided by laboratories in dif

33、ferent countries, representing the most reliable data available at this time. At present, reference values for only one type of circumaural earphone, SENNHEISER HDA 200, are available. This earphone provides a good attenuation of background noise and its frequency response is without pronounced reso

34、nances on a human ear as well as on an ear simulator. ENISO3898:2004INTENRATIONAL TSANDADR IS-983 O8:(4002E)I SO 4002 All irthgs ersedevr 1Acoustics Reference zero for the calibration of audiometric equipment Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural

35、 earphones 1 Scope This part of ISO 389 specifies reference equivalent threshold sound pressure levels (RETSPLs) for pure tones in the frequency range from 125 Hz to 8 kHz, applicable to the calibration of air conduction audiometers equipped with a particular model of circumaural earphones (SENNHEIS

36、ER HDA 200). NOTE Some notes and references on the derivation and the test conditions used to determine the recommended reference levels are given in Annex A and the Bibliography. The sound attenuation of the earphone is given in Annex B. For speech audiometers of types A-E and B-E (see IEC 60645-2)

37、, the correction figures of the earphone for a free-field equivalent output are given in Annex C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest

38、 edition of the referenced document (including any amendments) applies. ISO 389-1, Acoustics Reference zero for the calibration of audiometric equipment Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones ISO 4869-1, Acoustics Hearing protectors Part

39、 1: Subjective method for the measurement of sound attenuation IEC 60318-1, Electroacoustics Simulators of human head and ear Part 1: Ear simulator for the calibration of supra-aural earphones IEC 60318-2:1998, Electroacoustics Simulators of human head and ear Part 2: An interim acoustic coupler for

40、 the calibration of audiometric earphones in the extended high-frequency range IEC 60645-2, Audiometers Part 2: Equipment for speech audiometry 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 389-1, ISO 4869-1, IEC 60318-1 and IEC 60645-2 apply. ENIS

41、O3898:2004IS-983 O8:(4002E) 2 I SO 4002 All irthgs ersedevr4 Specifications The reference equivalent threshold sound pressure levels depend on the model of earphone and on the combination of the coupler or ear simulator and adapter used to calibrate it. Values for a closed-type circumaural earphone,

42、 SENNHEISER HDA 200, using an ear simulator and adapter as specified in IEC 60318-1 and IEC 60318-2:1998, Figure 1, respectively, are given in Table 1. Table 1 Reference equivalent threshold sound pressure levels of a circumaural earphone for a specified ear simulator and a specified adapter RETSPL

43、(ref. 20 Pa), in dB bModel of earphone Frequency Hz SENNHEISER HDA 200 125 160 a200 a30,5 26,0 22,0 250 315 a400 a18,0 15,5 13,5 500 630 a750 11,0 8,0 6,0 800 a1 000 1 250 a6,0 5,5 6,0 1 500 1 600 a2 000 5,5 5,5 4,5 2500 a3 000 3 150 a3,0 2,5 4,0 4 000 5 000 6 000 9,5 14,0 17,0 6 300 a8 000 c17,5 17

44、,5 aValues for these frequencies are partly derived by interpolation. bValues rounded to the nearest half decibel. cValue taken from ISO/TR 389-5. NOTE Values for the HDA 200 earphone are based on the results from five laboratories (see Annex A). They are derived from determinations of the threshold

45、 of hearing of otologically normal persons under conditions as close as possible to those described in Reference 1. ENISO3898:2004IS-983 O8:(4002E) I SO 4002 All irthgs ersedevr 3The characteristics of earphones depend on temperature. It is therefore recommended to calibrate audiometers equipped wit

46、h these earphones as closely as possible within the temperature range 21 C to 25 C. The headband force of the circumaural earphone HDA 200 shall be within 10,0 N 1,0 N. The headband force shall be measured when the two earphones are separated by 145 mm and the height of the earphone is adjusted to p

47、rovide a distance of 130 mm measured between the centre (top) of the headband and a line between the centres of the earphones. ENISO3898:2004IS-983 O8:(4002E) 4 I SO 4002 All irthgs ersedevrAnnex A (informative) Notes on the derivation of the reference equivalent threshold sound pressure levels for

48、the circumaural audiometric earphone HDA 200 The reference equivalent threshold sound pressure levels for the circumaural audiometric earphone specified in this part of ISO 389 are obtained from the results of five independent experimental investigations (see References 2 to 6). Specific details of the tests are given in Table A.1. Table A.1 Investigations of equivalent threshold sound pressure