Crash Course on Character Encodings
[Pages:47]Crash Course on Character Encodings
Yusuke Shinyama
NYCNLP Oct. 27, 2006
Introduction
2
Are they the same?
? Unicode ? UTF
3
Two Mappings
Character
Character Code
"
64
1590
32654
Byte Sequence
64 216 182 231 190 142
4
Two Mappings
Character
Unicode
Character Code
UTF-8
"
64
Byte Sequence
64
1590
216 182
32654 231 190 142
"Character Set" "Encoding Scheme"
5
Terminology
? Character Set
- Mapping from abstract characters to numbers.
? Encoding Scheme
- Way to represent (encode) a number in a byte sequence in a decodable way.
- Only necessary for character sets that have more than 256 characters.
6
In ASCII...
Character
ASCII
Character Code
5
53
A
65
m 109
Byte Sequence
53 65 109
7
Character Sets
8
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