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GB/T 38640-2020 English PDF

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GB/T 38640-2020: Digital publishing format for visually impaired people
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Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 38640-2020	English	929	Add to Cart	7 days [Need to translate]	Digital publishing format for visually impaired people	Valid	GB/T 38640-2020

PDF similar to GB/T 38640-2020

Standard similar to GB/T 38640-2020

GB/T 42450 GB/T 40685 GB/T 39788 GB/T 38634.5 GB/T 38634.1

Basic data

Standard ID	GB/T 38640-2020 (GB/T38640-2020)
Description (Translated English)	Digital publishing format for visually impaired people
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	L77
Classification of International Standard	35.240.30
Word Count Estimation	50,521
Date of Issue	2020-04-28
Date of Implementation	2020-11-01
Quoted Standard	GB/T 17975.1; GB/T 17975.2; GB/T 18793; GB/T 25724; ISO/IEC 14496-2; ISO/IEC 14496-10
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration
Summary	This standard specifies the publication format of blind text, pictures, audio and video, and the synchronization format of blind media files. This standard applies to the editing, design, production and use of digital publications for blind use.

GB/T 38640-2020: Digital publishing format for visually impaired people

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Digital publishing format for visually impaired people ICS 35.240.30 L77 National Standards of People's Republic of China Blind use digital publishing format 2020-04-28 released 2020-11-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Preface Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Abbreviations 1 5 Blind text publishing format 2 5.1 Basic requirements for blind text publishing format 2 5.1.1 Overview 2 5.1.2 File information 2 5.1.3 File content 2 5.1.4 Format attributes 3 5.2 Blind text publishing in XML format 3 5.2.1 Overview 3 5.2.2 Root element 3 5.2.3 File information 3 5.2.4 File content 4 5.2.5 Format attributes 5 5.3 Blind text publishing BDO format 6 5.3.1 Overview 6 5.3.2 File information 6 5.3.3 File content 7 5.3.4 Format attributes 8 6 Blind use picture publishing format 8 6.1 Electronic Braille Graphic Publishing Format 8 6.2 E-map publishing format 8 7 Audio publishing format for the blind 9 8 Video publishing format for blind use 9 9 Blind use of media file synchronization format 9 9.1 Overview 9 9.2 Basic requirements 9 9.3 Automatic call of special navigation mode 10 9.4 "Skipable" structure 10 9.5 File packaging across media units 10 9.6 Link 10 9.7 The content of the par element 10 9.8 Image in SMIL 10 9.9 Digital publications for the blind with text only 10 9.10 Producer pause 11 Appendix A (Normative Appendix) XML Structure of Electronic Braille Text 12 Appendix B (informative appendix) Example of digital publication format for blind use 13 References 46 Blind use digital publishing format

1 Scope

This standard specifies the publishing format of text, pictures, audio and video for blind use, and the synchronization format of media files for blind use. This standard applies to the editing, design, production and use of digital publications for the blind.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 17975.1 Information Technology General Coding of Moving Pictures and Accompanying Information Part 1.System GB/T 17975.2 Information Technology General Coding of Moving Pictures and Accompanying Information Part 2.Video GB/T 18793 Information Technology Extensible Markup Language (XML) 1.0 GB/T 25724 Public Security Video Surveillance Digital Video and Audio Codec Technical Requirements ISO /IEC 14496-2 Information Technology Audio-Video Object Coding Part 2.Video ISO /IEC 14496-10 Information Technology Audio-Video Object Coding Part 10.Advanced Video Coding

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Blind use of digital publishing For people with reduced vision or vision loss due to visual disabilities, use digital technology to edit, process, and copy works. Professional activities that provide digital products or content services. 3.2 Electronic braille Braille content stored in digital form. 3.3 Accessible film and television works Audiovisual publications with screen commentary, subtitles, and sign language. [GB/T 36719-2018, definition 3.15]

4 Abbreviations

The following abbreviations apply to this document.

5 Blind text publishing format

5.1 Basic Requirements for Blind Text Publishing Format 5.1.1 Overview Braille text publishing includes electronic braille text publishing and electronic text publishing. The electronic braille text is based on the file. The document can be a book, a magazine, an article or a paragraph. Electronic braille files include file information, file content and format attributes. The electronic text publishing format can refer to the electronic braille text publishing format. 5.1.2 File information File information is used to define the configuration parameters of the entire file, including text, page, margin, layout and other parameters. a) The text used in the "text" parameter definition file should contain two attributes. storage and display. The values of both attributes include non-blind Text, Braille, text comparison; b) The "page" parameter defines the page size used in the file, which should contain two attributes. width and height; c) The "margin" parameter defines the margin of the page, which should contain 4 attributes. the top, bottom, left, and right margins of the page; d) The "layout" parameter defines the number of rows on the page and the number of squares in each row. It should contain two attributes. the number of rows and the number of columns. 5.1.3 File content An electronic Braille document should have and only one document content component, which can be composed of various content components. The files include cover, version record page, preface, table of contents, chapters, titles, text paragraphs, formulas, diagrams, musical scores, text comparison. a) The "cover" component defines the content of the cover page, which can be composed of content components such as text paragraphs, and provides information such as book title, author, and publisher. b) The "version record page" component defines the content of the version record page, which can be composed of content components such as text paragraphs, and provides copyright instructions, Information such as book-in-print cataloging data and version records. c) The "preface" component is used to define the content of the preface, which can be composed of content components such as text paragraphs. d) The "catalog" component defines the contents of the catalog, which can be composed of content components such as text paragraphs, and provides information such as titles and additional page numbers. e) The "Chapter" component defines the content in the chapter, the chapter has the "level" attribute, and the value is 1~5.Chapters are required parts of the file, If the chapter is not explicitly set, the content of all the text (ie non-table of contents, version record pages, preface, etc.) will be regarded as a chapter by default. f) The "Title" component defines the content of the title of the text chapter, the title has the "level" attribute, and the value is 1 to 5. g) The "text paragraph" component defines a paragraph composed of words. All text should be included in the text paragraph. Paragraph is not included A segment of continuous text with line breaks, but when displayed and printed, a line break will be added to the end of the paragraph. An empty paragraph widget will A blank line is generated during display and printing. Text paragraphs can contain "text comparison" components. h) The "Formula" component defines the content of the formula, which can include two components. non-braille formula and braille formula. i) "Picture" component defines the content of the diagram, which can include two components. electronic diagram and electronic braille diagram. Electronic diagrams and electronic Braille diagrams both have "come Source" attribute, its value is the file name or network link address, used to specify the source of the image file. j) The "Score" component defines the content of the score. k) "Text comparison" includes two parts. Braille and the text to be compared with it. When the document is textual comparison, braille and The text of the photo is divided into words or continuous writing units, and each symbol is designated by word or continuous writing unit parts.

7 Audio Publishing Format for the Blind

The audio publishing format for blind use should meet the following requirements. a) Blind audio uses digital audio format; b) Blind audio resources adopt G.711, G.722, G.723.1 and G.729 formats, and the bit rate can be 16kbps, 32kbps and 64kbps.

8 Blind use video publishing format

Accessible film and television works are the publishing form of blind video, and the publishing format requirements are as follows. a) The combination of video and screen commentary, subtitles, and sign language form a complete accessible film and television work. b) Screen commentary, subtitles, and sign language use clear language, text, and gestures to describe the plot content in the video. c) Adopt digital video format, MPEG-2, SVAC, MPEG-4, H.264 and other formats can be used. 1) The system stream of MPEG-2 meets the requirements of GB/T 17975.1, and the video meets the requirements of GB/T 17975.2; 2) The system code stream of SVAC meets the requirements of GB/T 17975.1, and the video meets the requirements of GB/T 25724; 3) The system stream of MPEG-4 meets the requirements of GB/T 17975.1, and the video meets the requirements of ISO /IEC 14496-2; 4) The system code stream of H.264 meets the regulations of GB/T 17975.1, and the video meets the regulations of ISO /IEC 14496-10; 5) Other formats that conform to international or national standards can be used.

9 Blind use of media file synchronization format

9.1 Overview The blind media file synchronization format should define one or more media playback sequence objects. The main media objects are audio and text files. Pieces; provide parallel and synchronous presentations. The document type definition (DTD) of this standard is used to ensure the uniformity of the standard universal markup language and extensible markup language document format. Through the use of various document type definitions, standard universal markup language and extensible markup language files conform to the prescribed data exchange standards. This standard will take SMIL as an example to describe the blind media file synchronization format. Anything built with SMIL and the content consists of standard text, audio Digital publications for blind use with media type encoding can be used in any SMIL-compatible player or SMIL compatible player that uses the same or higher SMIL version. Play on the platform, as long as there is the necessary audio and text rendering decoder and there is no intellectual property protection to restrict access to the system. See Appendix B for an example of the format of a digital audio book for the blind. 9.2 Basic requirements The basic requirements for blind media file synchronization format are as follows. a) A standard blind-use digital publication with media file synchronization requirements should contain at least one SMIL file; b) All SMIL files should be XML files conforming to dtbsmil-2005-1.dtd, and the XMLNS attribute of SMIL elements should be in The designation is displayed in the file instance; c) The time container in the SMIL file should contain an identifier; d) The time offset of all SMIL files should be based on regular playback speed; e) The player should be able to handle the time offset independently at the actual playback speed to maintain synchronization; f) In the text file, each segment that needs to be synchronized (such as headings, paragraphs, list items, etc.) should be contained in an element. There is a unique identifier corresponding to the SMIL segment point; g) Any text file element referenced by the SMIL file should contain a label attribute, which can specify the SMIL The specific location of the time container or media object. 9.3 Automatic call of special navigation mode When entering a table or list, developers who should support the blind use of digital publication playback devices can choose to automatically trigger a special player navigation mode. 9.4 "Skipable" structure The "skippable" structure requirements are as follows. a) The player should provide the option to "turn off" the specific structure of the digital publication for blind use, that is, the player will automatically Skip structure, but only applicable to blind digital publications where the SMIL time container happens to contain a skippable structure. If one The time container in a digital publication for blind use saves complete chapters, so the structures described in this section cannot be "skippable". b) When the user jumps directly to a skippable element that has been closed through the global navigation, the player should ignore the current state and And display the content of the element. 9.5 File packaging across media units When a digital publication for blind use spans multiple media units (such as CD-ROM discs), all files involved in SMIL should be The SMIL file is placed in the same media unit, ensuring that the player only needs to track the location of the SMIL file to provide a complete blind Display with digital publications. 9.6 Link The link requirements are as follows. a) If the link appears in the text content file of the digital publication for blind use, it should be included in the corresponding SMIL file. b) The text content and the associated links in the SMIL file should point to the same information in the text content and the SMIL file. Such as Pointing to media content that is not a digital publication for blind use should be marked as an external link, and regardless of whether the digital publication player for blind use is Whether these contents can be displayed, external media content must be displayed by external applications. c) The default behavior of a link is to be effective at least for the duration of the time it contains the target. The player can establish other behaviors (than If it remains valid within the preset time period, the user can modify it or until the next link is encountered). 9.7 The content of the par element The content requirements of the par element are as follows. a) Each par element can only contain at most one text, audio, image or seq element; b) When there are both text content and audio files, the text and audio in the same par element should indicate the same in the material Content (such as the same paragraph); c) The portable digital publication playback device for the blind has resource limitations, and the SMIL display rendered by multiple audio media at the same time cannot be create; d) The reading system is not required to support multiple audio files rendered simultaneously. 9.8 Images in SMIL The duration of the image display should be equal to the longest media object time. 9.9 Digital publications for the blind with text only Digital publications for blind use that only contain text should meet the following requirements. a) SMIL files can be included to ensure that users can access many features brought by SMIL; b) In a blind-use digital publication that does not contain audio materials, the duration of the text media object can be controlled by the user or by the broadcaster. Amplifier control. 9.10 Producer pause The producer suspension shall meet the following requirements. a) The producer can allow the display of the digital publication for the blind to be suspended until the user performs an action to resume playback. Producer can use These pauses give users time to do exercises or view physical models related to the content. b) The producer can choose the maximum activity duration of the specified time container. Activity duration is content duration plus blind use Any time the producer wishes to allow before the digital publication resumes playback (if the user does not resume playback directly).

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