EN 60268-16:2003
(Main)Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
defines objective methods for rating the transmission quality of speech with respect to intelligibility. The four methods, which are closely related, are referred to as the STI, the STITEL, the STIPA and the RASTI methods (see Clause 3).
Elektroakustische Geräte - Teil 16: Objektive Bewertung der Sprachverständlichkeit durch den Sprachübertragungsindex
Equipements pour systèmes électroacoustiques - Partie 16: Evaluation objective de l'intelligibilité de la parole au moyen de l'indice de transmission de la parole
Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index (IEC 60268-16:2003)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
1DGRPHãþD
SIST EN 60268-16:1999
Sound system equipment - Part 16: Objective rating of speech intelligibility by
speech transmission index (IEC 60268-16:2003)
Sound system equipment -- Part 16: Objective rating of speech intelligibility by speech
transmission index
Elektroakustische Geräte -- Teil 16: Objektive Bewertung der Sprachverständlichkeit
durch den Sprachübertragungsindex
Equipements pour systèmes électroacoustiques -- Partie 16: Evaluation objective de
l'intelligibilité de la parole au moyen de l'indice de transmission de la parole
Ta slovenski standard je istoveten z: EN 60268-16:2003
ICS:
33.160.30 Avdio sistemi Audio systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 60268-16
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2003
ICS 33.160.01 Supersedes EN 60268-16:1998
English version
Sound system equipment
Part 16: Objective rating of speech intelligibility
by speech transmission index
(IEC 60268-16:2003)
Equipements pour systèmes Elektroakustische Geräte
électroacoustiques Teil 16: Objektive Bewertung der
Partie 16: Evaluation objective Sprachverständlichkeit durch den
de l'intelligibilité de la parole Sprachübertragungsindex
au moyen de l'indice de transmission (IEC 60268-16:2003)
de la parole
(CEI 60268-16:2003)
This European Standard was approved by CENELEC on 2003-07-01. CENELEC 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 references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC 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 CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60268-16:2003 E
Foreword
The text of document 100/650/FDIS, future edition 3 of IEC 60268-16, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 60268-16 on 2003-07-01.
This European Standard supersedes EN 60268-16:1998.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-07-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A and ZA are normative and annexes B to E are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60268-16:2003 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60268-16:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
ISO/TR 4870 1991 Acoustics - The construction and - -
calibration of speech intelligibility tests
ITU-T 1996 Artificial mouth - -
Recommendation
P.51
INTERNATIONAL IEC
STANDARD
60268-16
Third edition
2003-05
Sound system equipment –
Part 16:
Objective rating of speech intelligibility
by speech transmission index
Equipements pour systèmes électroacoustiques –
Partie 16:
Evaluation objective de l'intelligibilité de la parole
au moyen de l'indice de transmission de la parole
IEC 2003 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
– 2 – 60268-16 IEC:2003(E)
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Definitions and abbreviations. 6
4 Description of the methods . 7
4.1 General . 7
4.2 The STI method. 8
4.3 The STITEL method. 9
4.4 The STIPA method .10
4.5 The RASTI method .10
4.6 Methods of measurement.13
5 Methods of determining intelligibility .15
5.1 Word tests .15
5.2 Modified rhyme tests.15
5.3 Speech Intelligibility Index .15
5.4 Articulation loss of consonants .15
Annex A (normative) Speech transmission index (STI) and revised (STI ) methods .16
r
A.1 Background .16
A.2 The STI method .19
A.3 The test signals .23
Annex B (informative) The STITEL method.24
Annex C (informative) The STIPA method .25
Annex D (informative) The RASTI method .26
Annex E (informative) Qualification of the STI and relation with some subjective
intelligibility measures.27
Bibliography.28
Figure 1 – Modulation transfer function: input/output comparison . 7
Figure 2 – Relationship between the theoretical STI by the RASTI method and the STI
measured by a proprietary equipment with a measurement time of 12 s approximately .11
Figure 3 – Conditions under which RASTI results do not differ by more than 0,05 .12
Figure A.1 – Envelope function (panel A) of a 10 s speech signal for the 250 Hz
octave band and corresponding envelope spectrum (panel B) .16
Figure A.2 – Theoretical expression of the MTF .18
Figure A.3 – The measurement system and frequencies for the STI method.19
Figure A.4 – Auditory masking strength of octave band (k – 1) on that above (k).20
Figure A.5 – The relationship between effective signal-to-noise ratio and transmission
index for a shift of 15 dB and a range of 30 dB.22
Figure D.1 – Illustration of a practical RASTI test signal.26
Figure E.1 – Qualification of the STI and relation with some subjective intelligibility
measures .27
60268-16 IEC:2003(E) – 3 –
Table A.1 – Octave level specific slope of masking and corresponding auditory
masking factor (amf) .21
Table A.2 – STI octave band specific male and female weighting factors .23
r
Table A.3 – Octave band levels (dB) relative to the A-weighted long-term speech level.23
Table B.1 – STITEL: modulation frequencies for the seven octave bands.24
Table C.1 – STIPA: modulation frequencies for the seven octave bands .25
Table C.2 – STI octave band specific male and female weighting factors adopted
r
to STIPA .25
– 4 – 60268-16 IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOUND SYSTEM EQUIPMENT –
Part 16: Objective rating of speech intelligibility
by speech transmission index
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60268-16 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This third edition cancels and replaces the second edition, published in 1998. This third
edition constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
100/650/FDIS 100/677/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in
...
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