1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T H.702 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1 (03/2017) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS IPTV multimedia services and applications for IPTV General aspects Accessibility profiles for IPTV s
2、ystems: Various corrections and clarifications Corrigendum 1 Recommendation ITU-T H.702 (2015) Corrigendum 1 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission
3、 multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and mult
4、imedia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.360H.369 Telepresence H.420H.429 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H
5、.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility in
6、terworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applicati
7、ons and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV s
8、ervice discovery up to consumption H.770H.779 Digital Signage H.780H.789 E-HEALTH MULTIMEDIA SERVICES AND APPLICATIONS Personal health systems H.810H.819 Interoperability compliance testing of personal health systems (HRN, PAN, LAN, TAN and WAN) H.820H.859 Multimedia e-health data exchange services
9、H.860H.869 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) i Recommendation ITU-T H.702 Accessibility profiles for IPTV systems: Various corrections and clarifications Corrigendum 1 Summary Recommendation ITU-T H.702 defines three profi
10、les for accessibility features in Internet protocol television (IPTV) systems, with increasing levels of support. The Basic profile provides an entry-level support of accessibility, whereas the Main profile provides the widest range of features; the Enhanced profile provides the middle level support
11、 between the Basic profile and the Main profile. Accessibility information is information such as captions, sign language streams and audio description that are sent separately from video contents to IPTV terminal devices. By defining the above profiles, persons with disabilities can choose more eas
12、ily the terminal devices that have the functions they need. Corrigendum 1 harmonizes the variations of the profile name, such as “basic accessibility profile“ and “basic profile“ into “basic profile“, and uniforms the variations of the optionality “O“ and “OR“ into “OR“. History Edition Recommendati
13、on Approval Study Group Unique ID* 1.0 ITU-T H.702 2015-11-29 16 11.1002/1000/12648 1.1 ITU-T H.702 (2015) Cor. 1 2017-03-01 16 11.1002/1000/13192 Keywords Accessibility, audio description, caption, IPTV, sign language. * To access the Recommendation, type the URL http:/handle.itu.int/ in the addres
14、s field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunicat
15、ions, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunicatio
16、ns on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure la
17、id down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunic
18、ation administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these man
19、datory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws
20、attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or o
21、thers outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not repres
22、ent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.702 (2015)/C
23、or.1 (03/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 Conventions 3 6 Background . 4 7 Accessibility service . 4 7.1 Overview 4 7.2 Architecture 4 7.3 Required
24、 functions 5 8 Profiles 7 8.1 Details of profiles . 7 8.2 Requirement for transmitting device 11 Appendix I An implementation method with ITU-T H.762 . 12 I.1 Terminal device 12 Appendix II Accessibility medium flow to ITA . 15 Bibliography. 16 iv Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) List of Tabl
25、es Page Table 1 Capabilities of caption, sign language and audio description 5 Table 2 Capabilities of profiles . 10 List of Figures Page Figure 1 Functional blocks of accessibility service 5 Figure II.1 Accessibility medium flow to ITA . 15 Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) v Introduction Thi
26、s Recommendation defines three profiles for accessibility features in Internet protocol television (IPTV) systems, with increasing levels of support. The Basic profile provides an entry-level support of accessibility, whereas the Main profile provides the widest range of features. Beyond 2020, the M
27、ain profile should be available in all IPTV terminal devices that are considered fully accessible. Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) 1 Recommendation ITU-T H.702 Accessibility profiles for IPTV systems: Various corrections and clarifications Corrigendum 1 Editorial note: This is a complete-tex
28、t publication. Modifications introduced by this corrigendum are shown in revision marks relative to Recommendation ITU-T H.702 (2015). 1 Scope This Recommendation describes the functions for displaying accessibility information such as caption, sign language and audio description that is sent separa
29、tely from video contents to Internet protocol television (IPTV) terminal devices. They are categorized by support levels, which are defined as profiles. By defining profiles, users can choose more easily the terminal devices that have the functions they desire. 2 References The following ITU-T Recom
30、mendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are th
31、erefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a st
32、and-alone document, the status of a Recommendation. ITU-T F.791 Recommendation ITU-T F.791 (2015), Accessibility terms and definitions. ITU-T H.720 Recommendation ITU-T H.720 (2008), Overview of IPTV terminal devices and end systems. ITU-T H.721 Recommendation ITU-T H.721 (2015), IPTV terminal devic
33、es: Basic model. ITU-T H.760 Recommendation ITU-T H.760 (2009), Overview of multimedia application frameworks for IPTV services. ITU-T H.761 Recommendation ITU-T H.761 (2014), Nested context language (NCL) and Ginga-NCL. ITU-T H.762 Recommendation ITU-T H.762 (2011), Lightweight interactive multimed
34、ia environment (LIME) for IPTV services. ITU-T H.763.1 Recommendation ITU-T H.763.1 (2010), Cascading style sheets for IPTV services. ITU-T H.764 Recommendation ITU-T H.764 (2012), IPTV services enhanced script language. ITU-T H.765 Recommendation ITU-T H.765 (2015), Packaged IPTV application (widge
35、t) service. ITU-T H.780 Recommendation ITU-T.780 (2012), Digital signage: Service requirements and IPTV-based architecture. ITU-T Y.101 Recommendation ITU-T Y.101 (2000), Global Information Infrastructure terminology: Terms and definitions. 2 Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) ITU-T Y.1901 Reco
36、mmendation ITU-T Y.1901 (2008), Requirements for the support of IPTV services. ITU-T Y.1910 Recommendation ITU-T Y.1910 (2008), IPTV functional architecture. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 access service ITU-T F.791: Ad
37、ditional accessibility features intended to make primary audiovisual content accessible to users with specific impairments or preferences or in specific environmental contexts of use. Examples of common access services are captioning subtitling, audio description and sign language interpretation. Me
38、tadata is often available in an EPG to allow a user to be able to determine the access services available. 3.1.2 application ITU-T Y.101: A structured set of capabilities, which provide value-added functionality supported by one or more services. 3.1.3 audio captioning ITU-T F.791: Audio captioning
39、is a function that provides captions that are read aloud and reflected as speech. Audio captioning may also be called “audio subtitles“ or “spoken subtitles“ in the case of foreign language dialogue. It can also be used to designate audio content of an audiovisual work or sequence in any language al
40、ong with action is read aloud by a human or a specific apparatus that converts the text into speech. 3.1.4 audio description ITU-T F.791: Also known as video description and described video. The service provides additional audible narrative, interleaved with the dialogue, which describes the signifi
41、cant aspects of the visual content of audiovisual media that cannot be understood from the main soundtrack alone. 3.1.5 captions/captioning ITU-T F.791: Captions provide a real-time on-screen transcript of the dialogue as well as any sound effects. This service can be provided by means of either tex
42、tual or graphical supplementary content. The captions and the dialogue are usually in the same language. The service is primarily to assist users having difficulty hearing the sound. NOTE Subtitles are the transcription of spoken words, while captions include spoken words plus any meaningful sound w
43、hose perception is important to understand the content of the audiovisual program. 3.1.6 close/open accessibility services ITU-T F.791: All accessibility services audio description, audio subtitling, captioning, and sign language may have the possibility of being elective by the end user. If this is
44、 the case, it is closed. If it cannot be selected by the user it is an open service. 3.1.7 content ITU-T H.780: A combination of audio, still image, graphic, video or data. 3.1.8 sign language ITU-T F.791: A sign language (also called signed language or simply visual signing) is a natural language w
45、hich, instead of acoustically conveyed sound patterns, uses manual communication with the hands, facial expressions and body language to convey meaning. 3.1.9 terminal device (TD) ITU-T Y.1901: An end-user device which typically presents and/or processes the content, such as a personal computer, a c
46、omputer peripheral, a mobile device, a TV set, a monitor, a VoIP terminal or an audiovisual media player. Rec. ITU-T H.702 (2015)/Cor.1 (03/2017) 3 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 accessibility medium: The media stream containing access
47、ibility information, such as audio stream with audio description, text stream with closed captions, and video stream with sign language interpretation. 3.2.2 accessibility service: Same as access service (see clause 3.1.1). 3.2.3 caption box: Opaque or translucent rectangle area in which caption is
48、placed. 3.2.4 profile: A set of capabilities for accessibility to be implemented in an IPTV end system. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: CSS Cascading Style Sheets DOM Document Object Model EPG Electronic Program Guide HE Head End HTTP H
49、ypertext Transfer Protocol IPTV Internet Protocol Television ITA IPTV Terminals with Accessibility enhancements PWD Persons With Disabilities TV Television VOD Video on Demand 5 Conventions In this Recommendation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted, if conformance to this Recommendation is to be claimed. The keywords “is prohibited from“ indicate a requirement which must be strict
