1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 8253-3:2012Acoustics Audiometric test methodsPart 3: Speech audiometry (ISO 8253-3:2012)BS EN ISO 8253-3:2012 BRITISH STANDARDNational forewordThis British Standard is
2、the UK implementation of EN ISO 8253-3:2012. It supersedes BS EN ISO 8253-3:1998,which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e E H / 1 , A c o u s t i c s .A list of organizations represented on this committee can be obtained on reque
3、st to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 71001 8 ICS 13.140 Compliance with a British Sta
4、ndard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2012.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8253-3 M
5、arch 2012 ICS 13.140 Supersedes EN ISO 8253-3:1998English Version Acoustics - Audiometric test methods - Part 3: Speech audiometry (ISO 8253-3:2012) Acoustique - Mthodes dessais audiomtriques - Partie 3: Audiomtrie vocale (ISO 8253-3:2012) Akustik - Audiometrische Prfverfahren - Teil 3: Sprachaudiom
6、etrie (ISO 8253-3:2012) This European Standard was approved by CEN on 29 February 2012. 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 list
7、s and bibliographical references 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
8、the responsibility of a CEN 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, France, Ge
9、rmany, 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 EUROPISCHES KOMITEE
10、FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8253-3:2012: EBS EN ISO 8253-3:2012EN ISO 8253-3:2012 (E) 3 Foreword This document (EN ISO 8253-3:2012) has be
11、en prepared by Technical Committee ISO/TC 43 “Acoustics“ 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
12、the latest by September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012. 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 responsible for identifying
13、any or all such patent rights. This document supersedes EN ISO 8253-3:1998. 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, Cyprus, Czech Republic, D
14、enmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 8253-3:2012 has
15、 been approved by CEN as a EN ISO 8253-3:2012 without any modification. BS EN ISO 8253-3:2012ISO 8253-3:2012(E) ISO 2012 All rights reserved iiiContents PageForeword . vIntroduction . vi1 Scope 12 Normative references . 13 Terms and definitions . 14 Requirements for recording of speech material . 54
16、.1 General requirements . 54.2 Reference recording . 54.3 Recording environment . 64.4 Frequency response of recording equipment . 64.5 Interval between successive test items 64.6 Levels . 64.7 Signal-to-noise ratio . 64.8 Phonemic balance across test lists . 64.9 Perceptual balance across test list
17、s 75 Validation of speech material recordings . 75.1 General . 75.2 Determination of reference speech recognition curve . 75.3 Determination of perceptual equivalence of test lists . 85.4 Determination of repeatability of results (average test-retest reliability) 85.5 Documentation . 96 Requirements
18、 for speech audiometry . 97 Ambient sound pressure levels in test room for speech audiometry . 98 Sound field speech audiometry . 99 Preparation and instruction of test subject .109.1 General .109.2 Preparation of test subject .109.3 Instruction of test subject .1010 Subjects response mode 1011 Dete
19、rmination of speech detection threshold level . 1112 Determination of speech recognition threshold level . 1112.1 General . 1112.2 Descending procedure using 5 dB steps .1212.3 Alternative descending procedure .1212.4 Adaptive procedure using fixed step sizes 1312.5 Other adaptive procedure .1413 De
20、termination of speech recognition scores 1414 Contralateral masking 1415 Speech audiometry with competing sound .1515.1 Type of competing sound 1515.2 Presentation of competing sound 1515.3 Speech and competing sound levels .1515.4 Test procedure .1516 Format of speech audiogram .1717 Measurement un
21、certainty .1718 Maintenance and calibration of equipment 1818.1 General .18BS EN ISO 8253-3:2012ISO 8253-3:2012(E)iv ISO 2012 All rights reserved18.2 Intervals between tests 1818.3 Stage A: Routine checking and listening tests .1818.4 Stage B: Periodic electroacoustic tests 1918.5 Stage C: Basic cal
22、ibration tests 19Annex A (informative) Example of speech materials 20Annex B (informative) Examples of competing sound conditions 21Annex C (informative) Typical results .22Annex D (informative) Optimization of perceptual balance of test lists 24Annex E (informative) Measurement uncertainty .25Bibli
23、ography .30BS EN ISO 8253-3:2012ISO 8253-3:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each
24、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 the work. ISO collaborates closely with the International
25、 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 International Standards. Draft International Standards ad
26、opted 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 of the elements of this document may be the subject of pat
27、ent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 8253-3 was prepared by Technical Committee ISO/TC 43, Acoustics.This second edition cancels and replaces the first edition (ISO 8253-3:1996), which has been technically revised.ISO 8253 consists of the fo
28、llowing parts, under the general title Acoustics Audiometric test methods: Part 1: Pure-tone air and bone conduction threshold audiometry Part 2: Sound field audiometry with pure-tone and narrow-band test signals Part 3: Speech audiometry ISO 2012 All rights reserved vBS EN ISO 8253-3:2012ISO 8253-3
29、:2012(E)IntroductionSpeech audiometry is used for the assessment of hearing in connection with diagnostic evaluation and audiological rehabilitation.The results of speech audiometry depend on the speech material and test method used. This part of ISO 8253 sets conditions for speech materials in orde
30、r to assure minimum requirements of precision and comparability between different tests using different speech materials including materials in different languages. It also specifies procedures to be used when testing speech recognition.vi ISO 2012 All rights reservedBS EN ISO 8253-3:2012Acoustics A
31、udiometric test methods Part 3: Speech audiometry1 ScopeThis part of ISO 8253 specifies basic methods for speech recognition tests for audiological applications.In order to ensure minimum requirements of precision and comparability between different test procedures including speech recognition tests
32、 in different languages, this part of ISO 8253 specifies requirements for the composition, validation and evaluation of speech test materials, and the realization of speech recognition tests. This part of ISO 8253 does not specify the contents of the speech material because of the variety of languag
33、es.Furthermore, this part of ISO 8253 also specifies the determination of reference values and fulfilment requirements for the realization and manner of presentation.This part of ISO 8253 specifies procedures and requirements for speech audiometry with the recorded test material being presented by a
34、ir conduction through an earphone, or from a loudspeaker for sound field audiometry. Methods for using noise either for masking the non-test ear or as a competing sound are described.Some test subjects, for example children, can require amended test procedures not specified in this part of ISO 8253.
35、Specialized tests such as those used for evaluating directional hearing and dichotic hearing are outside the scope of this part of ISO 8253.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited ap
36、plies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 266, Acoustics Preferred frequenciesISO 8253-1, Acoustics Audiometric test methods Part 1: Pure-tone air and bone conduction audiometryISO 8253-2, Acoustics Audiometric test methods Pa
37、rt 2: Sound field audiometry with pure-tone and narrow-band test signalsISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)IEC 60645-1, Electroacoustics Audiological equipment Part 1: Pure-tone audiometers IEC 60645-2:1993, Audiomet
38、ers Part 2: Equipment for speech audiometryIEC 61672-1, Electroacoustics Sound level meters Part 1: Specifications3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 8253-1 and ISO 8253-2 and the following apply.INTERNATIONAL STANDARD ISO 8253-3:2012(E) I
39、SO 2012 All rights reserved 1BS EN ISO 8253-3:2012ISO 8253-3:2012(E)3.1speech signalacoustic signal which carries information in a given languageNOTE A speech signal may be a voice signal or an acoustic signal simulating a voice signal.3.2test itemparticular monosyllabic or polysyllabic word or loga
40、tom, or sentence, or time-limited segment of connected speech, used in accordance with defined rules of presentation and scoring in a speech audiometric procedureNOTE Scoring may be based on a complete test item or parts thereof being correctly recognized.3.3speech materialentire set of test items w
41、hich is used for speech recognition testsNOTE Usually the speech material is subdivided into several test lists. 3.4open-set test materialset of test items in which the number of alternative responses to each test item is unlimited3.5closed-set test materialset of test items in which the number of a
42、lternative responses to each test item is limited3.6phonemesmallest recognizable unit of speech in a given natural language3.7phoneme classsubdivision of phonemes that show characteristic similarities in vocal production mode as well as in acoustical signal properties3.8syllablesegment of speech whi
43、ch consists of a vowel with or without one or more accompanying consonants immediately preceding or following3.9spondeetwo-syllable word with equal stress on each syllable3.10logatomsyllabic unit that has no verbal meaning to the listenerNOTE A logatom is sometimes called a “nonsense syllable”.3.11t
44、est listnumber of selected test items, presented and scored as a single unit3.12set of test itemsselected number of test items from a test list2 ISO 2012 All rights reservedBS EN ISO 8253-3:2012ISO 8253-3:2012(E)3.13phonemically balanced test listtest list which contains approximately the same propo
45、rtions of the various phonemes as are present in typical speech communication within a given language3.14perceptually balanced test listtest list which yield equivalent speech recognition score with minimized variance at a specified speech level under equivalent conditions (specified manner of prese
46、ntation and specified group of listeners)NOTE Usually the specified group of listeners consists of otologically normal persons with an age from 18 years to 25 years inclusive. For special tests, different groups (e.g. otologically normal children within a specified age range) may be used as well.3.1
47、5carrier phrasesentence or phrase in which a test item is embedded such that the correct recognition of the test item is not dependent upon the context or meaning of the sentence or phrase3.16reference recording of speech materialmaster recordingwell-defined recording that represents the speech mate
48、rial and that is used for validation and application of the speech material3.17speech levelequivalent continuous sound pressure level of the speech material as measured in an appropriate coupler, ear simulator or in a sound field, with frequency weighting C according to IEC 61672-1NOTE For speech te
49、st lists based on single test items separated by silent intervals, the integration does not include these intervals. For test lists based on single test items with a carrier phrase, the integration includes the test items only. In a digital recording, the silent intervals can be removed by editing. Numerical correction may also be made by determination of the total duration of the test items and the total duration of the silent intervals.3.18equivalent continuous sound pressure levelLp,eqTten times the logarithm to the bas
