1、 IEC 62944 Edition 1.0 2016-12 INTERNATIONAL STANDARD Audio, video and multimedia systems and equipment Digital television accessibility Functional specifications IEC 62944:2016-12(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherwi
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10、c If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 62944 Edition 1.0 2016-12 INTERNATIONAL STANDARD Audio, video and multimedia systems and equipment Digital television accessibility Functional specificati
11、ons INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 11.180.99; 33.160.01; 35.240.95 ISBN 978-2-8322-3686-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 62944:2016 IEC 2016 CONTENTS FORE
12、WORD . 5 1 Scope 7 2 Normative references 7 3 Terms, definitions and abbreviated terms 7 3.1 Terms and definitions 7 3.2 Abbreviated terms . 9 4 General . 10 4.1 Overview. 10 4.2 Objective 10 4.3 Summary 10 4.4 Principles 11 4.5 Considerations 11 5 Accessibility related to auditory perception 11 5.1
13、 Overview. 11 5.2 Essential functions 11 5.2.1 List of functions . 11 5.2.2 Closed captioning 12 5.2.3 Subtitles 12 5.2.4 (Open) Sign language 12 5.3 Additional functions . 13 6 Accessibility related to visual perception 13 6.1 Overview. 13 6.2 Essential functions 13 6.2.1 List of functions . 13 6.2
14、.2 Audio description . 14 6.2.3 Spoken subtitles 14 6.3 Additional functions . 14 6.4 Solutions for users with little or no visual perception . 14 6.4.1 Physical buttons and keys . 14 6.4.2 Assistive speech 16 6.4.3 Tone-based feedback 17 6.4.4 Speech recognition 18 6.5 Solutions for users with low
15、visual perception . 18 6.5.1 Overview . 18 6.5.2 Large fonts, icons, and buttons 18 6.5.3 Screen magnifier . 19 6.5.4 Arrows . 20 6.5.5 High contrast . 20 6.5.6 Background images . 20 6.6 Solutions for those with limited colour vision perception 20 7 Accessibility related to mobility 20 7.1 Overview
16、. 20 7.2 Functions 21 7.2.1 General . 21 7.2.2 Single hand operation 21 7.2.3 Single button operation 21 IEC 62944:2016 IEC 2016 3 7.2.4 Resting the remote control on a surface 21 7.2.5 Angle of use 21 8 Accessibility related to cognitive abilities . 21 8.1 Overview. 21 8.2 Language 22 8.3 Icons . 2
17、2 8.4 Labels . 22 8.5 Buttons . 22 8.6 Use of red . 22 8.7 Simplicity 22 9 Accessibility related all (other) perception . 22 9.1 Setup 22 9.1.1 Overview . 22 9.1.2 Entering account and authorisation information . 23 9.1.3 Suggested sequence for initial setup . 23 9.2 Content search . 24 Annex A (inf
18、ormative) Remote controls and buttons 26 Annex B (informative) On screen display 28 Annex C (informative) Content . 29 C.1 General . 29 C.2 Closed captioning . 29 C.3 Spoken subtitles . 29 C.4 Subtitles . 29 C.5 (Open) Sign language . 30 Annex D (informative) External devices. 31 D.1 Overview. 31 D.
19、2 Pairing with external devices . 31 D.3 External audio/headphone connections . 32 D.4 Support for USB human interface input/output devices 32 Annex E (informative) Background . 33 E.1 Widest range of users . 33 E.2 Context of use 33 E.3 Accessibility considerations 34 E.4 Accessibility principles 3
20、4 E.4.1 General . 34 E.4.2 Functional equivalency 35 E.4.3 User interface accessibility 35 E.4.4 Content accessibility 35 E.4.5 Accessibility through external solutions . 36 E.4.6 Evaluating accessibility and usability . 36 E.4.7 Multi-modality 37 Annex F (informative) Brief user profile outline 38
21、F.1 Preliminary remarks 38 F.2 Key demographic groups 38 F.2.1 Blind and partially sighted people 38 F.2.2 People with colour blindness . 39 F.2.3 Deaf and hard of hearing people 39 F.2.4 People with physical disabilities . 40 4 IEC 62944:2016 IEC 2016 F.2.5 People with cognitive disabilities . 40 F
22、.2.6 Older people 41 F.3 Key statistics 41 Annex G (informative) Guidance on use of colours 42 Annex H (informative) User abilities, characteristics and preferences Environment and context of use 43 Annex I (informative) Future access services . 44 Annex J (informative) FCC user interface rules 45 B
23、ibliography 46 Figure 1 Recommended layout of numeric keys . 16 Figure A.1 Layout of numeric keys in Japan . 27 Table H.1 User abilities, characteristics and preferences . 43 IEC 62944:2016 IEC 2016 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ AUDIO, VIDEO AND MULTIMEDIA SYSTEMS AND EQUIPMENT DIGIT
24、AL TELEVISION ACCESSIBILITY FUNCTIONAL SPECIFICATIONS 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-operat
25、ion 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 “
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33、ding 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
34、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 62944 has been prepared by technical area 16:
35、Active assisted living (AAL), accessibility and user interfaces, of IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this standard is based on the following documents: CDV Report on voting 100/2640/CDV 100/2795/RVC Full information on the voting for the app
36、roval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. 6 IEC 62944:2016 IEC 2016 The committee has decided that the contents of this document will remain unchanged until
37、 the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IE
38、C 62944:2016 IEC 2016 7 AUDIO, VIDEO AND MULTIMEDIA SYSTEMS AND EQUIPMENT DIGITAL TELEVISION ACCESSIBILITY FUNCTIONAL SPECIFICATIONS 1 Scope This document specifies a set of principles and considerations for digital television products in support of older people and persons with disabilities in addi
39、tion to mainstream users. The effect of following the principles and considerations as set out in this document is to ensure that the widest range of users can access, understand and use digital television products. These principles and considerations cover four main user profiles such as individual
40、s with hearing impairments, individuals with sight impairments, individuals with mobility impairments and individuals with cognitive impairments. This document applies to consumer solutions whose primary function is to receive digital television, such as integrated digital televisions, set top boxes
41、, digital television recorders and equivalent products and devices (see Annex D). All these solutions are referred to as digital television solutions throughout this document. The standard does not cover solutions that support digital television as a secondary function (for instance gaming consoles
42、or computers with digital receiver cards). However, much of the content also provides for future solutions and/or implementations.This document does not cover delivery, unpacking, secure installation on a stand or wall mounting or first time connection of the power and signals. 2 Normative reference
43、s The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) appl
44、ies. IEC 62731:2013, Text-to-speech for television General requirements ISO 7001:2007, Graphical symbols Public information symbols ISO 24500:2010, Ergonomics Accessible design Auditory signals for consumer products ISO 24501:2010, Ergonomics Accessible design Sound pressure levels of auditory signa
45、ls for consumer products ISO 24503:2011, Ergonomics Accessible design Tactile dots and bars on consumer products 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological data
46、bases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 8 IEC 62944:2016 IEC 2016 3.1.1 access service additional or alternative content associated with a television progr
47、amme, intended to make the programme accessible to specific users EXAMPLE Audio/video description for blind and partially sighted people, captioning/subtitling for deaf and hard of hearing people and/or for delivery to different language audiences, signed programmes for sign language users, etc. 3.1
48、.2 high definition HD video resolution, typically in the range of 720 to 1 080 vertical lines 3.1.3 standard definition SD video resolution, typically in the range of 480 to 576 vertical lines 3.1.4 electronic program guide EPG on screen application that provides users with scheduling information fo
49、r current and upcoming programming 3.1.5 safe area area of the television picture that can be seen on the great majority of television screens Note 1 to entry: See ST 2046-1:2009, RP 218-2002, and FCC 79.101 (12). 3.1.6 text-to-speech TTS solution that converts textual content to the audible content speech, often implemented with a speech synthesizer system 3.1.7 audio description AD verbal depiction of key visual elements in media and live productions Note 1 to entry: See 6
