[liblouis-liblouisxml] Re: Question about english computer braille tables
- From: "John J. Boyer" <john.boyer@xxxxxxxxxxxxxxxxx>
- To: liblouis-liblouisxml@xxxxxxxxxxxxx
- Date: Fri, 17 Feb 2012 12:51:10 -0600
As far as I know, the BANA standard specifies that uppercase letters
should be preceded by dots 456. If there is a string of uppercase
letters it should be preceded by dots 456-126. If lowercase letters
follow uppercase letters the change is indicated by dots 456-345. The
underscore is represented by dots 456-456.
John B.
On Fri, Feb 17, 2012 at 09:27:42AM -0800, John Gardner wrote:
> Maybe I'm just confused, but my memory is that official US 6-dot computer
> braille does not distinguish upper and lower case letters. To get that
> distinction it is necessary to use the 8 dot code. If I'm right, then this
> table may be producing something sensible, but it is not official computer
> braille.
>
> John G
>
>
> -----Original Message-----
> From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx
> [mailto:liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of John J.
> Boyer
> Sent: Friday, February 17, 2012 6:22 AM
> To: liblouis-liblouisxml@xxxxxxxxxxxxx
> Subject: [liblouis-liblouisxml] Re: Question about english computer braille
> tables
>
> Hi Yuemei,
>
> The tables are ok. The comp6 opcode overrides uplow, so en-us-comp6.ctb
> will produce the dot pattern 456-1 for uppercase a.
>
> John
> On Thu, Feb 16, 2012 at 10:22:49AM -0800, Yuemei Sun wrote:
> > Hi, John,
> >
> > Thank you for the explanation. For the en-us-comp6.ctb, there are two
> > places that mention the A, one is "uplow Aa 17,1", the other is "comp6 A
> > 456-1". The "uplow Aa" is not defined as "456-1,1"as you mentioned. Is
> > the table in SVN repository for en-us-comp6.ctb not updated?
> >
> > Thanks,
> > Yuemei
> >
> > On 2/14/2012 2:09 PM, John J. Boyer wrote:
> > >I decided to check this out. Hopefully others will have comments also.
> > >The general question is which tables are for computer braille. There may
> > >be different computer braille tables for different languages. Some of
> > >the g0 tables seem to be for computer braille.
> > >
> > >Of the U.S. English tables, en-us-compbrl.ctb should probably be
> > >ignored. en-us-comp8.ctb contains 8-dot computer braille. Uppercase
> > >letters have dot 7 added to the dots for the lowercase letters. In U.S.
> > >English computer braille uppercase letters require two cells. They are
> > >preceded by dots 456. Thus in en-us-comp6.ctb we have the entry
> > >
> > >uplow Aa 456-1,1
> > >
> > >John
> > >
> > >
> > >
> > >On Tue, Feb 14, 2012 at 10:33:00AM -0800, Yuemei Sun wrote:
> > >>Can anybody explain the use of the three American English braille
> > >>tables, en-us-comp6.ctb, en-us-comp8.ctb, and en-us-compbrl.ctb? I
> > >>looked at the table, it looks to me that only the en-us-comp6.ctb has
> > >>entries defining 8 dot compuer braille for upper case letters. The same
> > >>table also has "comp6 A 456-1" entry. In this case, what will upper
> > >>case A be translated into, one cell with dot patter 17, or two cells
> > >>with pattern "456-1"? In other words, what table should I use if I want
> > >>6-dot US computer braille, and what table is for 8-dot US computer
> > >>braille?
> > >>
> > >>Thanks,
> > >>
> > >>--
> > >>Yuemei Sun
> > >>
> > >>Software Engineer
> > >>yuemei.sun@xxxxxxxxxxxx
> > >>541-754-4002 ext 229
> > >>
> > >>For a description of the software, to download it and links to
> > >>project pages go to http://www.abilitiessoft.com
> >
> > --
> > Yuemei Sun
> >
> > Software Engineer
> > yuemei.sun@xxxxxxxxxxxx
> > 541-754-4002 ext 229
> >
> > For a description of the software, to download it and links to
> > project pages go to http://www.abilitiessoft.com
>
> --
> John J. Boyer; President, Chief Software Developer
> Abilitiessoft, Inc.
> http://www.abilitiessoft.com
> Madison, Wisconsin USA
> Developing software for people with disabilities
>
> For a description of the software, to download it and links to
> project pages go to http://www.abilitiessoft.com
>
> For a description of the software, to download it and links to
> project pages go to http://www.abilitiessoft.com
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
For a description of the software, to download it and links to
project pages go to http://www.abilitiessoft.com
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