1、BRITISH STANDARDBS EN ISO 389-6:2007Acoustics Reference zero for the calibration of audiometric equipment Part 6: Reference threshold of hearing for test signals of short durationThe European Standard EN ISO 389-6:2007 has the status of a British StandardICS 13.140g49g50g3g38g50g51g60g44g49g42g3g58g
2、44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 389-6:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August
3、 2007 BSI 2007ISBN 978 0 580 54490 3National forewordThis British Standard is the UK implementation of EN ISO 389-6:2007. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to Subcommittee EH/1/1, Hearing.A list of organizations represented on this committe
4、e can be obtained on request to its secretary.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 cannot confer immunity from legal obligations.Amendments issued since publicatio
5、nAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 389-6July 2007ICS 13.140English VersionAcoustics - Reference zero for the calibration of audiometricequipment - Part 6: Reference threshold of hearing for testsignals of short duration (ISO 389-6:2007)Acoustique - Zro de rf
6、rence pour ltalonnagedquipements audiomtriques - Partie 6: Niveauxliminaires daudition de rfrence pour signaux dessai decourte dure (ISO 389-6:2007)Akustik - Bezugsschwellen zur Kalibrierung vonAudiometern - Teil 6: quivalente Bezugsschwellen-Schalldruckpegel fr akustische Kurzzeit-Testsignale (ISO3
7、89-6:2007)This European Standard was approved by CEN on 30 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographica
8、l references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN mem
9、ber into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, La
10、tvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussel
11、s 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 389-6:2007: E3 Foreword This document (EN ISO 389-6:2007) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 211
12、“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 January 2008, and conflicting national standards shall be withdrawn at the latest by January 200
13、8. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ital
14、y, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 389-6:2007 has been approved by CEN as a EN ISO 389-6:2007 without any modification. EN ISO 389-6:2007Ref
15、erence numberISO 389-6:2007(E)INTERNATIONAL STANDARD ISO389-6First edition2007-07-01Acoustics Reference zero for the calibration of audiometric equipment Part 6: Reference threshold of hearing for test signals of short duration Acoustique Zro de rfrence pour ltalonnage dquipements audiomtriques Part
16、ie 6: Niveaux liminaires daudition de rfrence pour signaux dessai de courte dure EN ISO 389-6:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norma
17、lly 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in th
18、e work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare
19、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 at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some
20、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 389-6 was prepared by Technical Committee ISO/TC 43, Acoustics. ISO 389 consists of the following parts, under the general title Acoustics Refere
21、nce 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 sound pressure levels for pure tones and insert earphones Part 3: Reference equivalent threshold force l
22、evels 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 to 16 kHz Part 6: Reference threshold of hearing for test signals of short duration Part 7: Referenc
23、e threshold of hearing under free-field and diffuse-field 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 levels EN ISO 389-6:2007iv Intro
24、duction IEC 60645-3 specifies audiometric test signals of short duration. These short-duration signals consist of clicks and tone-bursts, and they are used in different diagnostic tests, e.g. in Evoked Response Audiometry such as auditory electrophysiology (electrocochleography, auditory brainstem r
25、esponses, etc.), and transient evoked otoacoustic emissions. This part of ISO 389 specifies reference threshold values for the short-duration signals. The reference hearing threshold data for specific transducers described herein will promote agreement and uniformity in the expression of results of
26、hearing threshold measurements. EN ISO 389-6:20071Acoustics Reference zero for the calibration of audiometric equipment Part 6: Reference threshold of hearing for test signals of short duration 1 Scope This part of ISO 389 specifies reference hearing threshold levels for tests signals of short durat
27、ion applicable to the calibration of audiometric equipment where such signals are used. NOTE 1 Some notes on different parameters and their effects on threshold levels are given in Annex A. NOTE 2 Preferred test conditions for determining hearing thresholds for standardization are specified in ISO 3
28、89-9. 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 edition of the referenced document (including any amendments) applies. ISO 389-1, Acoustics
29、 Reference zero for the calibration of audiometric equipment Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones IEC 60318-1, Electroacoustics Simulators of human head and ear Part 1: Ear simulator for the calibration of supra-aural and circumaural e
30、arphones IEC 60318-4, Electroacoustics Simulators of human head and ear Part 4: Occluded-ear simulator for the measurement of earphones coupled to the ear by inserts 1)IEC 60318-6, Electroacoustics Simulators of human head and ear Part 6: Mechanical coupler for the measurements on bone vibrators 2)I
31、EC 61094-1, Measurement microphones Part 1: Specifications for laboratory standard microphones 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 389-1 and the following apply. 3.1 short-duration signal signal having a duration of less than 200 ms 1) Re
32、vision of IEC 60711:1981. 2) Revision of IEC 60373:1990. EN ISO 389-6:20072 3.2 click transient acoustic or vibratory signal whose frequency spectrum covers a broad frequency range, and which is produced by applying a single rectangular pulse to a transducer 3.3 tone-burst sinusoidal signal multipli
33、ed by a time window of less than 200 ms 3.4 condensation signal short-duration signal, the initial pressure wave of which causes an over-pressure relative to ambient pressure, or the initial force wave of which causes an over-force relative to the static force at the plane of the output port of the
34、transducer 3.5 rarefaction signal short-duration signal, the initial pressure wave of which causes an under-pressure relative to ambient pressure, or the initial force wave of which causes an under-force relative to the static force at the plane of the output port of the transducer 3.6 alternating p
35、olarity signal series of short-duration signals, alternating between rarefaction and condensation signals 3.7 reference pulse electric rectangular pulse (single monophasic rectangular wave) of (100 10) s duration with rise and fall times less than 25 s as specified in IEC 60645-3:2007, 5.2 NOTE The
36、signal output of the transducer can vary considerably depending upon the type used. 3.8 reference tone-burst electric signal consisting of five periods of the fundamental sine wave and having a linear rise and fall of 1,6 periods and a duration of three periods as specified in IEC 60645-3:2007, 5.3
37、NOTE 1,6 periods of linear rise and fall corresponds to two periods from zero to 100 % amplitude. The signal envelope remains at the 100 % amplitude for one period. The reference tone-burst can also be described according to the 2-1-2 concept where 2 indicates the number of periods from zero to 100
38、% amplitude and back to zero, and 1 is the 100 % amplitude period. 3.9 reference equivalent threshold sound pressure level RETSPL at a specified frequency, the median value of the equivalent threshold sound pressure levels of a sufficiently large number of ears of otologically normal persons, of bot
39、h sexes, aged between 18 years and 25 years inclusive, expressing the threshold of hearing in a specified ear simulator for a specified type of earphone 3.10 reference equivalent threshold vibratory force level, monaural listening RETVFL at a specified frequency, the median value of the equivalent t
40、hreshold vibratory force levels of a sufficiently large number of ears of otologically normal persons, of both sexes, aged between 18 years and 25 years inclusive, expressing the threshold of hearing in a specified mechanical coupler for a specified configuration of bone vibrator EN ISO 389-6:200733
41、.11 reference threshold sound pressure level RTSPL at a specified frequency, the median value of the threshold sound pressure levels of a sufficiently large number of otologically normal persons, of both sexes, aged between 18 years and 25 years inclusive, expressing the threshold of hearing under f
42、ree-field conditions 3.12 peak-to-peak equivalent signal level root-mean-square (r.m.s.) value of a long-duration sinusoidal signal which, when compared under the same test conditions with a short-duration output signal from the transducer under test, has the same peak-to-peak value (i.e. difference
43、 between the extreme positive and the extreme negative values) as the short-duration signal NOTE 1 For clicks (3.2), the long-duration sinusoidal signal should have a frequency of 1 000 Hz, and for tone-bursts (3.3) its frequency should equal the fundamental frequency of the tone-burst. NOTE 2 The t
44、erm peak-to-peak equivalent signal level is often called peak equivalent signal level. NOTE 3 The peak level of a short-duration signal is between 3 dB and 9 dB greater than the peak-to-peak equivalent level, i.e. 3 dB when the signal is quite symmetrical around the zero baseline and 9 dB when it is
45、 completely on one side of the zero level. NOTE 4 The recommended abbreviations for peak-to-peak equivalent (pe) sound pressure level and vibratory force level are peSPL and peVFL. 3.13 peak-to-peak equivalent reference equivalent threshold sound pressure level or vibratory force level peRETSPL/peRE
46、TVFL peak-to-peak equivalent RETSPL or RETVFL value NOTE The equivalence in this clause when the full terms (peRETSPL or peRETVFL) are used is between two different signals. When short-duration signals are standardized as sound pressure levels or vibratory force levels for hearing threshold purposes
47、, a further equivalence occurs due to the method of measuring hearing threshold levels in an ear simulator or on a mechanical coupler, respectively, i.e. in terms of equivalent threshold sound pressure or vibratory force levels. 3.14 peak-to-peak equivalent reference threshold sound pressure level p
48、eRTSPL peak-to-peak equivalent RTSPL value 4 Specifications The reference hearing threshold levels depend on the type of test signal (click, tone-burst), the type of transducer (earphone, bone vibrator, loudspeaker) and the equipment used for calibration (ear simulator, free field). The recommended
49、standard values for the click signal based on the reference pulse are given in Tables 1 to 3. They are derived from determinations of the threshold of hearing of otologically normal persons (conditions given in References 4 to 6). Similarly, the recommended standard values for the reference tone-burst signals are given in Table 4. They are derived from determinations of the threshold of hearing of otologically normal persons (conditions given in References 6 to 8). EN ISO 389-6:20074 Tab
