1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN ISO 9921:2003 has the status of a British StandardICS 13.180Ergonomics Ass
2、essment of speech communicationBRITISH STANDARDBS EN ISO 9921:2003Incorporating Corrigenda Nos. 1 and 2BS EN ISO 9921:2003This British Standard was published under the authority of the Standards Policy and Strategy Committee on 26 November 2003 BSI 28 October 2005ISBN 0 580 42979 2request to its sec
3、retary.Cross-referencesThe British 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 Catalo
4、gue or of British Standards Online.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.Summary of pagesThis document com
5、prises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 28, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendmen
6、ts issued since publicationAmd. No. Date Comments14922 Corrigendum No. 123 December 2003 Correction to EN ISO foreword page15612 Corrigendum No. 228 October 2005 Addition of supersession detailsA list of organizations represented on this committee can be obtained on enquiries on the interpretation,
7、or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard is the official English language version of EN ISO 9921:2003. It is identical with ISO 9921:2003. It supersedes BS
8、 ISO 9921-1:1996, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PH/9, Applied ergonomics, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any EUROPEAN STANDARDNORME EU
9、ROPENNEEUROPISCHE NORMEN ISO 9921October 2003ICS 13.180English versionErgonomics - Assessment of speech communication (ISO9921:2003)Ergonomie - Evaluation de la communication parle (ISO9921:2003)Ergonomie - Beurteilung der Sprachkommunikation (ISO9921:2003)This European Standard was approved by CEN
10、on 1 October 2003.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 bibliographical references concerning such nationalstandards may
11、be obtained on application to the 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 member into its own language and notified to the Managemen
12、t Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland a
13、nd UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2003 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 9921:2
14、003 ECORRECTED 2003-12-03ForewordThis document (EN ISO 9921:2003) has been prepared by Technical Committee ISO/TC 159“Ergonomics“ in collaboration with Technical Committee CEN/TC 122 “Ergonomics“, thesecretariat of which is held by DIN.This European Standard shall be given the status of a national s
15、tandard, either by publication ofan identical text or by endorsement, at the latest by April 2004, and conflicting nationalstandards shall be withdrawn at the latest by April 2004.According to the CEN/CENELEC Internal Regulations, the national standards organizations ofthe following countries are bo
16、und to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland andthe United Kingdom.Endorsement noticeThe text of ISO 9921:20
17、03 has been approved by CEN as EN ISO 9921:2003 without anymodifications.EN ISO 9921:2003Reference numberISO 9921:2003(E)INTERNATIONAL STANDARD ISO9921First edition2003-10-15Ergonomics Assessment of speech communication Ergonomie valuation de la communication parle EN ISO 9921:2003DPlcsid Fremia ihT
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21、.devr lnUeto sswrehise specified, on trap fo this lbupictaion maeb y cudorperro de tuilizi den yna form ro na ybm ynae,s lecetrinoc ro mceinahcla, incliduntohp gcoiypodna gn micrfoilm, wittuoh repmissii now nritign from ietI rehSa Ot tsserdda eh ebolw or ISOs memreb i ydobn the cnuotfo yr ttseuqer e
22、he.r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 avleT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mial coirypthgis.o groWe bwww.is.o groii EN ISO 9921:2003I SO 3002 All irhgts seredevr iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions.
23、 1 4 Descriptions of speech communications. 3 4.1 General. 3 4.2 Speaker 3 4.3 Transmission channel 3 4.4 Listener 3 5 Performance of speech communications. 3 5.1 General. 3 5.2 Alert and warning situations 4 5.3 Person-to-person communications 4 5.4 Public address in public areas 4 5.5 Personal com
24、munication systems 5 5.6 Summary of recommended minimum performance 5 6 Assessment and prediction . 5 6.1 General. 5 6.2 Subjective assessment methods 5 6.3 Objective assessment and prediction methods 6 Annex A (normative) Speaker and listener characteristics . 7 Annex B (informative) Subjective spe
25、ech-intelligibility tests 9 Annex C (informative) Speech transmission index, STI . 12 Annex D (informative) Overview of the means of communication and related parameters . 14 Annex E (normative) Speech interference level, SIL 18 Annex F (informative) Intelligibility ratings for speech communications
26、. 19 Annex G (normative) Definition of symbols 22 Annex H (informative) Examples of applications of predictive intelligibility methods . 23 Bibliography . 28 EN ISO 9921:2003iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (I
27、SO 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 organizations, gov
28、ernmental 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 rules given in the ISO/IEC
29、 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 at least 75 % of the membe
30、r 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 9921 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcomm
31、ittee SC 5, Ergonomics of the physical environment. This first edition of ISO 9921 cancels and replaces ISO 9921-1:1996. EN ISO 9921:2003vIntroduction The aim of standardization in the field of the ergonomic assessment of speech-communication is to recommend the levels of speech-communication qualit
32、y required for conveying comprehensive messages in different applications. The quality of speech communication is assessed for the following cases: warning of hazard; warning of danger; information messages for work places, public areas, meeting rooms, and auditoria. For some applications, direct co
33、mmunication between humans is considered while, in others, the use of electro-acoustic systems (e.g. PA systems) or personal communication equipment (e.g. telephone, intercom) will be the most convenient means of informing and instructing or exchanging information. The use of auditory warning symbol
34、s other than speech is not included in this International Standard but is covered by ISO 7731. Acoustical danger and warning signals are in general omni-directional and therefore may be universal in many situations. Auditory warnings are of great benefit in situations where smoke, darkness or other
35、obstructions interfere with visual warnings. It is essential that, in the case of verbal messages, a sufficient level of intelligibility is achieved, in the coverage area. If this cannot be achieved, non-voice warning signals (see ISO 7731, IEC 60849 and 4 in the Bibliography) or visual warning sign
36、als (see ISO 11429) may be preferable. If acoustical signals are too loud, hearing damage or environmental problems may occur (e.g. noise nuisance to dwellings near railway platforms, road traffic, airports, etc.). Good design can minimize these negative aspects. In addition, prediction methods with
37、 sufficient accuracy are useful for consultants, suppliers and end-users and may thus reduce costs of necessary adjustments after installation of a system. The communications might be directly between humans, through public address or intercom systems or by pre-recorded messages. In general, text-to
38、-speech systems are not recommended because of the low intelligibility of these systems. It is recognized that, in a general-purpose document, simple to apply and easily available tools for prediction and assessment should be described, as well as more sophisticated advanced technological methodolog
39、ies. EN ISO 9921:2003INTENRATIONAL TSANDADR IS:1299 O3002(E)I SO 3002 All irhgts seredevr 1Ergonomics Assessment of speech communication 1 Scope This International Standard specifies the requirements for the performance of speech communication for verbal alert and danger signals, information message
40、s, and speech communication in general. Methods to predict and to assess the subjective and objective performance in practical applications are described and examples are given. In order to obtain optimal performance in a specific application, three stages can be considered: a) specification of the
41、application and definition of the corresponding performance criteria; b) design of a communication system and prediction of the performance; c) assessment of the performance for in situ conditions. The use of auditory warning signals other than speech is not included in this International Standard b
42、ut is covered by ISO 7731. 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.
43、 ISO/TR 4870:1991, Acoustics The construction and calibration of speech intelligibility tests IEC 60268-16:1998, Sound system equipment Part 16: Objective rating of speech intelligibility by speech transmission index 3 Terms and definitions For the purposes of this document, the following terms and
44、definitions apply. 3.1 alarm warning of existing or approaching danger 3.2 danger risk of harm or damage 3.3 effective signal-to-noise ratio measure to express the (combined) effect of various types of distortions on the intelligibility of a speech signal in terms of the effect of a masking noise re
45、sulting in a speech signal having the same intelligibility 3.4 emergency imminent risk or serious threat to persons or property 1EN ISO 9921:2003ISO 9921:2003(E) 2 I SO 3002 All irhgts seredevr3.5 Lombard effect spontaneous increase of the vocal effort induced by the increase of the ambient noise le
46、vel at the speakers ear 3.6 non-native speaker person speaking a language which is different from the language that was learned as the primary language during the childhood of the speaker 3.7 speech communication conveying or exchanging information using speech, speaking, hearing modalities, and und
47、erstanding NOTE Speech communication may involve brief texts, sentences, groups of words and/or isolated words. 3.8 speech communicability rating of the ease with which speech communication is performed NOTE Speech communicability includes speech intelligibility, speech quality, vocal effort, and de
48、lays. 3.9 speech intelligibility rating of the proportion of speech that is understood NOTE Speech intelligibility is usually quantified as the percentage of a message understood correctly. 3.10 speech intelligibility index SII objective method for prediction of intelligibility based on the Articula
49、tion Index NOTE See 1 in the Bibliography. 3.11 speech interference level SIL difference between A-weighted speech level and the arithmetic average of sound-pressure levels of ambient noise in four octave bands with central frequencies of 500 Hz, 1 000 Hz, 2 000 Hz and 4 000 Hz 3.12 speech quality rating of sound quality of a speech signal NOTE Speech quality characterizes the amount of audible distortion of a speech signal and is usually rated by a description. 3.13 speech transmissio
