ARIB member (regular members, supporting members and standard conference committee affiliated companies). You can download Japanese version of. 1 ARIB STDB37 Version E1 ENGLISH TRANSLATION STRUCTURE AND OPERATION OF CLOSED CAPTION DATA CONVEYED BY ANCILLARY DATA. 1, Part 3 of ARIB STD-B24 – Data coding and transmission specification ARIB STD-B37 – Structure and operation of closed-captioning data.
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No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior written permission of ARIB. This document is a translation into English of the approved document for the purpose of convenience of users.
If there are any discrepancies in the content, expressions, etc. Approved ARIB Standards and Technical Reports, in their original language, are made publicly available in hard copy, CDs or through web posting, generally in about one month after the date of approval. The original document of this translation may have been further revised and therefore users are encouraged to check the latest version at an appropriate page under the following URL:.
ARIB std-bb37 are nongovernmental standards established by combining governmental technical standards established for purpose of effective use of frequency and to avoid interference of other users, and nongovernmental optional standards established for convenience for radio communication equipment manufacturers, broadcasting equipment manufacturers, electric communication companies, service providers and users, in order to secure appropriate quality and compatibility of radio communication equipment and broadcasting equipment, etc.
This specific standard is applicable to the structure and operation of closed caption conveyed in the form of ancillary data packets. It was established by the approval of the standardization committee, participated widely and indiscriminately by radio equipment manufactures, broadcasting equipment manufacturers, telecommunication enterprises, broadcasters and users, to secure impartiality and std-v37. We hope that this standard will be put to practical use actively by radio communication equipment manufactures, broadcasting equipment manufactures Ztd-b37 In terms of this standard, no description about Essential Std-g37 Property Rights related to this standard is specified, however the holders of the said Essential Indusrial Property Rights have stated: The Industrial Property Rights listed in the annexed table related to this standard are owned by the person listed in the table.
The holder will grant the execution of the rights without any conditions to the persons who plan to use this standard, and will never claim respecting these rights shown in the said annexed table. This shall not apply, however, to a user of this standard in case the user owns Essential Arin Property Rights related arob all of part of the content defined by this standard and if he asserts the execution of said rights. Operational Guideline of Closed Caption. Program Conversion Using 3. Definition of Terminology An area for stuffing data and for additional ancillary data related to an individual stream.
A closed caption format for character multiplex broadcasting as used for analog television xtd-b37. Ancillary data which is embedded onto video signals for transmission.
BTA standards are referenced herein; however, BTA was relocated to ARIB following disbandment of the association in A mode wherein closed caption data packets are buffered by page data units before sending.
For more details, refer to Supplement 3. Transcripts of dialogue and the like which are displayed onscreen in synchrony with video.
General Information About Supported Formats
A name given to character data and control data for dialogue and the like as displayed onscreen in synchrony with video. An identifier which indicates the type of std-b7 caption page data which is being transmitted.
A closed caption data packet transmitted in ANC packet format. Data used during closedcaptioned programs when no closed caption data exists.
General Information About Supported Formats – AWS Elemental MediaLive
Header data comprised of the first 4 words of the UDW of a closed caption data packet i. A transmission unit for closed caption data as transmitted in one or more closed caption data packets. Corresponds to one page. An identifier which indicates a type for the display timing value i. Data count word which indicates the length of the UDW. Data identification word for ancillary data. The closed caption format used for data transmission in digital television broadcasting.
Time code parameters which determine the display timing control for closed caption data. A flag indicating the final ancillary packet of the closed caption data group.
CRC added when Group A is used for closedcaption text page management data. HD Closed Caption The closed caption format used in high definition digital television broadcasting. Language identifier An identifier which indicates the type of language used when multilanguage closed captions are broadcasted.
LEN A length indicator used in case of short form data to indicate the length of the data which follows it. LI A length indicator located at the start of the logic block to indicate the length of the data which follows it. Mobile Closed Caption The caption format used in digital television broadcasting for portable mobile receivers. Page The unit for a single closed caption screen. Page information The combination of page management information and page data. Page management information Management information for individual pages i.
Page data Data for characters displayed onscreen for a single page. A reception format in which only one segment of the portable Portable receiver Mobile reception hierarchy can be received. In preparation for Mobile receiver receivers, etc. Program control information Management information relevant to closedcaptioned programs i.
PTS Time management information used for the display of closed caption data. SD Closed Caption The closed caption format used in standard definition digital television broadcasting. SDID Secondary data identification word for ancillary data. Send mode identifier An identifier which indicates the transmission timing for closed caption data.
Sequential send mode A mode wherein closed caption data packets are sent in real time. Short form A transmission format wherein only the display timing, closed caption control data and closed caption text data are transmitted.
Start packet flag A flag indicating the leading ancillary packet of the closed caption data group. User data Data in a customized format as specified by the user. In this structure, furthermore, 1 word comprises 10 bits.
ARIB STD B24 character set
The structure of closed caption ancillary data packets is illustrated in Figure Ancillary data flag Data identification word Secondary data identification word Data count word User data words Checksum word Figure Values in parentheses correspond to the 10bit word which also includes both b8 i.
Note that the same notation will be used elsewhere in this standard.
Arrangement and Internal Makeup of Closed Caption Ancillary Data Packets The data length for individual closed caption ancillary data packets is fixed at words. The number of user data words is fixed at words.
Overview of ARIB Standards (STD-B37)｜Association of Radio Industries and Businesses
The names Closed caption ancillary data 1, Closed caption ancillary data 2, and Closed caption ancillary data 3 are applied in sequence from the leading ancillary data packet. It is preferable that closed caption ancillary data 1 be closed caption data conforming to the video data format.
For example, when closed caption data is embedded in HD video signals, it is preferable that closed caption ancillary data be in HD closed caption format. Closed caption ancillary data 2 option 1 can be used for closed caption data that has a different SDID from the closed caption data embedded in closed caption ancillary data 1. Closed caption ancillary data 3 option 2 can be used for closed caption data that has a different SDID from the closed caption data embedded in closed caption ancillary data 1 and closed caption ancillary data 2.
Undefined bits shall be set to 0 zero until defined. The CI increases by 1 for each packet, cycling between values from 0 to If set to [No error correction], the last 6 words from the UDW are not used and are all set to 00h h. If set to [Error correction], the last 6 words from the UDW constitute parity words. Code allocation for the error correction identifier is illustrated in Table Bit Allocation for Second Closed Caption Header Word Bit number b9 msb b8 b7 b6 b5 b4 b3 b2 b1 b0 lsb Description Inverse of b8 Even parity for b0 through b7 Undefined The second word is reserved for future extension purposes.
The content of this word shall be set at 00h h until defined. Bit Allocation for Third Closed Caption Header Word Bit number Description b9 msb Inverse of b8 b8 Even parity for b0 through b7 b7 Undefined b6 Start packet flag b5 End packet flag b4 Send mode identifier b3 b2 b1 Format identifier b0 lsb 1 Format identifier Indicating formats for the closed caption data, this identifier specifies the video signal format supported by the closed caption data in question.
Code allocation for the format identifier is illustrated in Table The closed caption format specified using the format identifier shall be the same type as the digital closed caption format specified by the DID or SDID. If the type is not consistent, the corresponding closed caption ancillary data words will be processed as invalid.
Note, however, that when the format identifier indicates No closed caption, any of the defined combination of DID and SDID can be used for digital closed caption. These closed caption formats are reserved for future extension purposes. No closed caption is embedded over this entire ancillary packet range. Code allocation for the send mode identifier is illustrated in Table Code Allocation for Send Mode Identifier b4 Description 0 Sequential send mode 1 Buffer send mode In the sequential send mode, closed caption data are embedded immediately as closed caption data packets.
In the buffer send mode, closed caption data are buffered in each page data unit and embedded as page unit data packet. The relationship between video and the various formats for sending digital closed caption are illustrated in Figure Buffer send mode Simultaneous send Closedcaptioned video Start Video displaying captions End The encoder reflects the receipt timing for the end packet of one page of closed caption data into the PTS.
Buffer send mode Advance send Start Closedcaptioned video End The encoder reflects the receipt timing for the end packet of one page of closed caption data into the PTS. Relationship between Output Mode and Output Timing Code allocation for the end packet flag is illustrated in Table Code Allocation for End Packet Flag b5 Description 0 Not end packet 1 End packet 4 Start packet flag The start packet flag indicates whether the closed caption data section of short form data will contain the start TS packet when closed caption PES packet data is divided into individual TS packets.
Code allocation for the start packet flag is illustrated in Table 29 and combinations of start packet flag and end packet flag are shown in Table Combinations of Start and End Packet Flags b6 b5 Description 0 0 Intermediate or dummy packet 0 1 End packet 1 0 Leading packet 1 1 Structure features one packet per data group Bit Allocation for Fourth Closed Caption Header Word Bit number b9 msb b8 b7 b6 b5 b4 b3 b2 b1 b0 lsb Description Inverse of b8 Even parity for b0 through b7 Undefined Closed caption data identifier Language identifier 1 Language identifier In situations where closed captions for multiple languages are sent using digital closed caption format i.
The 1 st language is specified when analog closed caption format is being used or when only one language is used with the digital closed caption format. Code allocation for the language identifier is illustrated in Table Code Allocation for Language Identifier b2 b1 b0 Description st language nd language rd language th language th language th language th language th language Two transmission formats are supported namely, exchange format and short form.
Short form refers to the transmission format in which closed caption data in either TS packets or analog closed caption packets are sent in synchrony with video. Code allocation for the closed caption data identifier is illustrated in Table