Volume 1 of the
Association of Radio Industries and Businesses (
ARIB) STD-B24 standard for
Broadcast Markup Language specifies, amongst other details, a
character encoding
Character encoding is the process of assigning numbers to graphical character (computing), characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using computers. The numerical v ...
for use in Japanese-language broadcasting. It was introduced on .
The latest revision is version 6.3 as of .
It includes a number of not found in the base standards (
JIS X 0208 and
JIS X 0201). It was the source standard for many symbol characters which were added to
Unicode
Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Char ...
, including portions of the
Miscellaneous Symbols,
Enclosed Alphanumeric Supplement and
Enclosed Ideographic Supplement blocks. Its contributions partially overlap the Unicode
emoji
An emoji ( ; plural emoji or emojis; , ) is a pictogram, logogram, ideogram, or smiley embedded in text and used in electronic messages and web pages. The primary function of modern emoji is to fill in emotional cues otherwise missing from type ...
, but were added a year earlier, in Unicode 5.2.
Fascicle 1 of the ARIB STD-B62 standard, published in 2014, defines Unicode mappings for a selection of the B24 extended characters (excluding, for example, those duplicated by
JIS X 0213), as well as a few extended Kanji.
It also includes a mapping of utilised characters outside the
Basic Multilingual Plane to the BMP's
private use area.
Sets and codes
The ARIB STD B24 standard defines multiple character sets and a method of switching between them. These include a Kanji set (an extension of
JIS X 0208), an Alphanumeric set, a Hiragana set, Katakana sets of two distinct layouts and four
mosaic
A mosaic () is a pattern or image made of small regular or irregular pieces of colored stone, glass or ceramic, held in place by plaster/Mortar (masonry), mortar, and covering a surface. Mosaics are often used as floor and wall decoration, and ...
sets. The sets are selected using
ISO 2022 mechanisms for 94-sets, using the following codes (proportional sets use the same layout as the corresponding non-proportional ones):
Code charts
Kanji (double-byte) set
This is a double-byte character set extending
JIS X 0208.
Lead byte
The encoding bytes correspond to the row or cell number plus 0x20, or 32 in decimal (see below). Hence, the code set starting with 0x21 has a row number of 1, and its cell 1 has a continuation byte of 0x21 (or 33), and so forth. Most of the code corresponds to JIS X 0208.
Character sets 0x21-0x74 (row numbers 1-84: punctuation, alphabets, numbers, Kana, Kanji)
Character set 0x75–0x76 (row numbers 85–86, additional kanji)
This part is the source standard for a small number of
CJK Unified Ideographs in Unicode, where it is designated with the source prefix in the
Unihan database.
Character set 0x7A (row number 90, traffic symbols)
Characters 90-45 through 90-63 and 90-66 through 90-84 (shown below shaded) are listed in the B24 standard only in table 7-10 (the list of extension characters), and are also the only characters in rows 90 through 91 which are not transport-related symbols; this is noted in the B24 standard in an endnote to table 7-10.
The remainder of the extensions are listed in both table 7-4 (the double-byte code chart) and table 7-10.
Character set 0x7B (row number 91, map symbols)
Characters from ARIB STD-B24 which were not retained in ARIB STD-B62 are shown shaded.
Character set 0x7C (row number 92, units, enclosed forms, list markers, arrows)
Characters from ARIB STD-B24 which were not retained in ARIB STD-B62 are shown shaded.
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Character set 0x7D (row number 93, game and weather symbols, fractions, units, enclosed forms)
Characters from ARIB STD-B24 which were not retained in ARIB STD-B62 are shown shaded.
Character set 0x7E (row number 94, list markers)
Characters from ARIB STD-B24 which were not retained in ARIB STD-B62 are shown shaded.
Single-byte sets
Alphanumeric set
Hiragana set
Katakana set
JIS X 0201 Katakana set
Mosaic sets
Most of ARIB STD-B24 Mosaic Set D does not exist in Unicode.
Shift_JIS variant
In addition to the modified ISO 2022 encoding, the B24 standard also specifies a
Shift JIS
Shift JIS (also SJIS, MIME name Shift_JIS, known as PCK in Solaris contexts) is a character encoding for the Japanese language, originally developed by the Japanese company ASCII Corporation in conjunction with Microsoft and standardized as JIS ...
encoding following JIS X 0208:1997, but with the addition of the extended characters in the kanji set.
See also
Footnotes
References
ARIB standards
*
*
*
Further reading
*
* (NB. Translated into Japanese and Chinese in 2002.)
External links
Official changelog for ARIB STD-B24
(
ARIB)
{{Character encoding
Character sets
Encodings of Japanese