IEC 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

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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

– 2 – 62731 © IEC:2013
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

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,
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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-
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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
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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.

– 4 – 62731 © IEC:2013
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.
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 ma
...