Hi Geoff. But as I understand, you would get difficulties if you wants to use grade two translation, there you can not use an unicode table.
Best regards Annie. Den Sep 1, 2011 kl. 12:10 AM skrev Geoff Shang: > On Tue, 30 Aug 2011, Paul Erkens wrote: > >> But what I never understood was the unicode thing you mention. Is unicode >> sort of an extended version of ascii? > > Unicode is the idea that all possible symbols can be represented in the same > character set. > > As you identified in your message, there are only 256 possible symbols in the > ASCII character set, 255 if you don't include the null character which is > number 0. But US-ASCII is only one of literally hundreds of character sets > that can be used to encode text. All these other character sets came into > being because of the large and varying range of symbols which needed to be > encoded. > > As this thread has demonstrated, switching between character sets is annoying > at best. Life would be a lot simpler if you could simply just use one > character set for everything and not have to change anything. And this is > what Unicode is trying to do. > > When people talk about Unicode, they're usually talking about the character > set called UTF-8. This is the most commonly used character encoding that > tries to meet the goals of Unicode. > > UTF-8 is a super-set of ASCII. All standard latin alpha-numeric characters > and punctuation symbols are represented in exactly the same way as they are > in ASCII, making it backward-compatible in a number of settings. > > For other symbols, UTF-8 uses up to 4 bytes to encode a character, thereby > getting around the limit of 256. The use of up to 4 bytes is presumably to > avoid ambiguity. > > For more information on Unicode and the various ways of representing it, see > http://en.wikipedia.org/wiki/Unicode > >> To what extent does the ascii table relate to a braille table, and what >> exactly is unicode and how does that get translated to a unicode braille >> table? > > The references to ASCII and Unicode in relation to Braille tables refers to > the symbols that are to be translated. Standard 6-dot Braille is, by its > nature, a 6-bit system, and even 8-dot Braille only needs 8 bits. So Braille > itself only needs at most one byte per character. > > A Unicode Braille table is able to display representations of Unicode text > without the need to change Braille tables for each represented language. > > HTH, > Geoff. > > -- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To post to this group, send email to macvisionaries@googlegroups.com. > To unsubscribe from this group, send email to > macvisionaries+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/macvisionaries?hl=en. > -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To post to this group, send email to macvisionaries@googlegroups.com. To unsubscribe from this group, send email to macvisionaries+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/macvisionaries?hl=en.
