SIST EN 62731:2013
(Main)Text-to-Speech for television - General requirements (IEC 62731:2013)
Text-to-Speech for television - General requirements (IEC 62731:2013)
This International Standard specifies the text-to-speech functionality for a (broadcast) receiver with a text-to-speech system. Such a system may be one device, i.e. a receiver with an integrated text-to-speech generator, or may be two devices, i.e. a receiver interfacing with an external text-to-speech device. This International Standard applies only to completely functional stationary (or semi-stationary) digital TV receivers such as set top boxes, integrated digital TVs, recorders and other products whose primary function is to receive TV content. Where this standard refers to TV, this will be shorthand for all such receivers. This International Standard does not apply to products that are capable of receiving TV as a secondary function (e.g. PCs or game consoles with digital television receivers). It also does not apply to sub-assemblies (e.g. PC tuner cards).
Text-zu-Sprache für Fernsehen - Allgemeine Anforderungen (IEC 62731:2013)
Synthèse vocale pour télévision - Exigences générales (CEI 62731:2013)
La CEI 62731:2013 définit la fonctionnalité de synthèse vocale pour un récepteur (de radiodiffusion) avec système de synthèse vocale. Un tel système peut être constitué d'un dispositif, à savoir, un récepteur avec un générateur de synthèse vocale intégré, ou être constitué de deux dispositifs, à savoir, un récepteur interfacé avec un dispositif de synthèse vocale extérieur. La présente Norme Internationale s'applique uniquement à des récepteurs de télévision numérique fixes (ou semi-fixes) entièrement fonctionnels, tels que des boîtiers décodeurs, des téléviseurs numériques intégrés, des enregistreurs et d'autres produits dont la fonction principale est de recevoir un contenu de télévision.
Pretvorba besedila v govor (govorna sinteza) za televizijo - Splošne zahteve (IEC 62731:2013)
Ta mednarodni standard določa funkcijo pretvorbe besedila v govor (govorne sinteze) za (televizijske) sprejemnike s sistemom pretvorbe besedila v govor. Tak sistem je lahko ena naprava, npr. sprejemnik z integriranim generatorjem za pretvorbo besedila v govor, ali pa dve napravi, npr. sprejemnik, ki se povezuje z zunanjo napravo za pretvorbo besedila v govor. Ta mednarodni standard velja samo za popolnoma funkcionalne stacionarne (ali delno stacionarne) digitalne TV-sprejemnike, kot so komunikatorji, integrirani digitalni televizijski sprejemniki, snemalniki in drugi izdelki, katerih glavna naloga je sprejemanje TV-vsebine. V tem standardu je TV okrajšava za vse take sprejemnike. Ta mednarodni standard ne velja za izdelke, pri katerih je sprejemanje TV-signala sekundarna funkcija (npr. osebni računalniki ali igralne konzole z digitalnimi televizijskimi sprejemniki). Prav tako ne velja za podsklope (npr. kartice sprejemnika za osebne računalnike).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62731:2013
01-julij-2013
Pretvorba besedila v govor (govorna sinteza) za televizijo - Splošne zahteve (IEC
62731:2013)
Text-to-Speech for television - General requirements (IEC 62731:2013)
Text-zu-Sprache für Fernsehen - Allgemeine Anforderungen (IEC 62731:2013)
Synthèse vocale pour télévision - Exigences générales (CEI 62731:2013)
Ta slovenski standard je istoveten z: EN 62731:2013
ICS:
33.160.25 Televizijski sprejemniki Television receivers
SIST EN 62731:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 62731:2013
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SIST EN 62731:2013
EUROPEAN STANDARD
EN 62731
NORME EUROPÉENNE
April 2013
EUROPÄISCHE NORM
ICS 33.160.25; 33.160.99
English version
Text-to-speech for television -
General requirements
(IEC 62731:2013)
Synthèse vocale pour télévision - Text-zu-Sprache für Fernsehen -
Exigences générales Allgemeine Anforderungen
(CEI 62731:2013) (IEC 62731:2013)
This European Standard was approved by CENELEC on 2013-03-05. 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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62731:2013 E
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SIST EN 62731:2013
EN 62731:2013 - 2 -
Foreword
The text of document 100/2070/FDIS, future edition 1 of IEC 62731, prepared by IEC/TC 100 "Audio,
video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 62731:2013.
The following dates are fixed:
(dop) 2013-12-05
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-03-05
• latest date by which the national
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62731:2013 was approved by CENELEC as a European
Standard without any modification.
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SIST EN 62731:2013
IEC 62731
®
Edition 1.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Text-to-speech for television – General requirements
Synthèse vocale pour télévision – Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 33.160.25; 33.160.99 ISBN 978-2-83220-600-3
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 5
3.1 Terms and definitions . 5
3.2 Abbreviations . 7
4 Guiding principles and conventions . 7
5 User requirements of visually impaired people . 7
5.1 Users' needs . 7
5.2 Navigating channels . 8
5.3 Navigating TV inputs . 8
5.4 Additional data services . 8
5.5 Operating the TV . 8
5.6 TV use . 9
6 Functional requirements . 9
6.1 Functionality for TV, TTS device combination . 9
6.2 Functionality: TTS device/engine . 10
6.3 Functionality: TV . 10
6.4 Setting up: TV, TTS device combination . 10
7 TV events and TTS data . 11
7.1 TV context and events . 11
7.2 TTS data per event . 12
7.2.1 Details . 12
7.2.2 Channel change . 12
7.2.3 Additional information . 13
7.2.4 Navigation and selection . 13
7.2.5 Context switch . 14
7.2.6 Pop-up message. 15
8 TTS profiles . 16
8.1 Basic profile . 16
8.2 Main profile . 16
8.3 Enhanced profile . 17
8.4 Summary . 17
Bibliography . 19
Figure 1 – TV – TTS device system diagram . 9
Figure 2 – Context event state diagram . 12
Table 1 – Overview of profiles . 18
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62731 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEXT-TO-SPEECH FOR TELEVISION –
GENERAL REQUIREMENTS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62731 has been prepared by IEC technical committee 100: Audio,
video and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/2070/FDIS 100/2109/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 62731:2013
62731 © IEC:2013 – 5 –
TEXT-TO-SPEECH FOR TELEVISION –
GENERAL REQUIREMENTS
1 Scope
This International Standard specifies the text-to-speech functionality for a (broadcast) receiver
with a text-to-speech system. Such a system may be one device, i.e. a receiver with an
integrated text-to-speech generator, or may be two devices, i.e. a receiver interfacing with an
external text-to-speech device. This International Standard applies only to completely
functional stationary (or semi-stationary) digital TV receivers such as set top boxes,
integrated digital TVs, recorders and other products whose primary function is to receive TV
content. Where this standard refers to TV, this will be shorthand for all such receivers.
This International Standard does not apply to products that are capable of receiving TV as a
secondary function (e.g. PCs or game consoles with digital television receivers). It also does
not apply to sub-assemblies (e.g. PC tuner cards).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
(void)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
context
one specific function of a TV
EXAMPLE Watching TV, EPG, etc.
3.1.2
DTV broadcast event
set of related broadcast streams with a defined start and end time, commonly referred to as a
TV programme
Note 1 to entry: DTV events have typically the following properties associated with them: start time, end time or
duration, content synopsis, additional content information, parental rating and availability of subtitles or audio
description.
3.1.3
DTV service information
metadata describing broadcasting content and its scheduling and timing details
Note 1 to entry: The purpose of DTV service information is to aid the end user to select and schedule viewing and
recording, and also to select the equipment configuration.
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3.1.4
DTV broadcast event classification
general category of programme/event content, or its classification
EXAMPLES Movie (drama), news/current affairs, talk show, sports (football), etc.
3.1.5
EPG filter
filter that organises or reduces the list of displayed EPG items according to certain criteria
EXAMPLES Of criteria are to show only:
• programmes with a certain content type;
• favourites;
• programmes that are audio described;
• programmes for a given time period (for instance "today", "tomorrow", "next 7 days").
3.1.6
event
trigger to start an action
3.1.7
list
collection of items
3.1.8
menu
subsequent order of items
3.1.9
receiver
device capable of receiving or handling digital television signals
3.1.10
service
sequence of programs under the control of a broadcaster which can be broadcast as part of a
schedule
3.1.11
subtitle
textual representation of the dialogue (and frequently additional auditory information),
typically shown at the bottom of the screen
Note 1 to entry: Subtitles can be a textual rendering in the same language as the spoken dialogue, or can provide
a written translation in a different language.
Note 2 to entry: In some parts of the world subtitles are called "(closed) captions", and subtitling is referred to as
"(closed) captioning".
Note 3 to entry: This standard uses the term subtitles throughout.
3.1.12
TTS audio
audio output by the TTS engine in correspondence with TTS data
Note 1 to entry: If the TV uses an external TTS converter, TTS audio is interpreted as TTS data.
3.1.13
TTS data
(text) data converted into TTS audio information by the text-to-speech engine
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62731 © IEC:2013 – 7 –
3.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
DTV digital television
EPG electronic programme guide
STB set top box
TTS text-to-speech
TV television
UI user interface
4 Guiding principles and conventions
This standard describes the required basic behaviour for a TV text-to-speech combination in a
basic profile, but also provides for enhanced profiles. It also gives a short introduction into the
basic problems of visually impaired people: i.e. what are the problems visually impaired
people experience when using and watching TV?
Providing text-to-speech functionality for a broadcast receiver, e.g. TV or STB can be of great
help to (visually) disabled people. Such speech functionality may be integrated in the receiver
or may be external to the receiver in a separate device.
In general as the guiding principle, when building a TTS interface in the context of this
standard, implementers should aspire to achieve functional equivalence of the user
experience. This means that a person operating the device using the speech interface should
have access to similar information and be able to accomplish similar tasks as with a graphical
UI.
The main features of this International Standard are:
• basic functional description for a TV-TTS device combination or TV with integrated TTS;
• profiles for different levels of TV-TTS functionality;
• targeted towards the digital TV application.
In this standard mandatory requirements are specified; optional and informative features are
also included.
A claim of conformity with this standard requires conformity with all mandatory requirements.
A TV-TTS device combination or a TV with a TTS that is integrated may provide options for a
user to enable or disable product features.
5 User requirements of visually impaired people
5.1 Users' needs
This subclause 5.1 explains the needs of visually impaired people as the primary target users
for a TV with TTS. Unless these needs are met, the system is not accessible to this user
group. Visually impaired people experience access barriers in the course of the following
activities when watching TV:
a) following TV programming, e.g. the TV series;
b) using a remote control;
c) not being able to see subtitles;
d) navigating channels;
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e) navigating TV inputs;
f) using additional data (text) services provided by the broadcaster, e.g. an EPG;
g) daily operation of the TV and initial setup of the TV for use.
Items a), b) and c) are outside the scope of this standard. Item c) further relates to the fact
that in some countries foreign language programmes are being translated via subtitles. For
users who cannot see the subtitles, supplementary audio services are sometimes used to
deliver an audio version of the subtitles. This standard elaborates on the remaining four items,
i.e. d), e), f) and g), in 5.2 to 5.6.
NOTE 1 For DVB systems, item a) is already solved by audio description. Also, the use case of providing
supplementary audio services to deliver an audio version of the subtitles is covered in the DVB-SI specification
ETSI EN 300 468.
NOTE 2 For ATSC systems, the audio system includes a visually impaired (VI) associate service which allows a
complete programme mix containing music, effects, dialogue, and additionally a narrative description of the picture
content, see ATSC A/53 part 5 and part 6.
5.2 Navigating channels
The problem is a user does not know which channel the TV displays, i.e. the user gets “lost
during navigation”. The TV is displaying navigation data on the screen but the user is unable
to see it. Such data are for example:
• channel number,
• service name,
• (DTV broadcast) event name.
5.3 Navigating TV inputs
The problem is that a user is unable to select the required input to the TV, e.g. the user
wishes to select DTV or a specific external input linked to a recording or other device. The
choice is shown on the screen but the user is unable to see it.
5.4 Additional data services
With digital TV a broadcaster may transmit additional data (text) services to augment TV
programming, provide add
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