[BRLTTY] Getting my braille driver for the FCHAD working.

[timothyhobbs at seznam.cz]

Oh, I had never heard of the opticon.  But yes it is similar.  It's a pity, 
seems you can no longer buy those devices.  I wanted to get an idea of the 
price!  When I was prototyping, I made my device work so that one used a 
stylus to select the character, rather than touching physical touch sensors.
  This was not a good method.  I found when reading that the main trouble 
was in figuring out where the stylus was and not accidentally skipping 
letters.  Jean-Phillipe tested that prototype at RMLL, so he can probably 
say more.  Of course I can program the device to scan across similarly to 
the opticon.  Take our sensor row as an example: 1 2 3 4 5 if the reader 
were to place only their index finger on the device, I could display for a 
touch registering only sensor 1, the entirety of the first character, for a 
touch registering 1 and 2 however, I could display the second half of the 
first character and the first half of the second.  I don't think this would 
be a very good system though.  But enough speculating.  I'll finish the 
device and we'll see!

Tim


---------- Původní zpráva ----------
Od: Dave Mielke <dave at mielke.cc>
Datum: 18. 10. 2012
Předmět: Re: [BRLTTY] Getting my braille driver for the FCHAD working.
"[quoted lines by S. Massy on 2012/10/18 at 16:37 -0400]

>Here's an interesting exercise, however: try
>reading with nothing *but* your index finger. Without my middle finger
>on the display as well, I notice a considerable slow-down, though not as
>significant as when reading with a different finger. My guess is the
>brain must use the signal from the forerunning fingers to perform some
>kind of preprocessing.

And, it also seems, from the trailing finger (middle finger of left hand) 
for 
error correction.

With just two index fingers, I notice that, at least for me, it works much 
better if both are right next to each other rather than a bit apart.

Tim: 

Your device reminds me a bit of a device I used to use to read print called 
an 
Optacon. To use it, the index finger of my left hand would rest on an array 
of 
vibrating pins. I believe the array was 24 high by 6 wide. My right hand 
would 
move a camera-like thing (known as the lens module), which was at the end of
a 
thin cable, over a printed page. The pins would show the image of the lines 
on 
the page. There was a zoom adjustment which one would adjust so that the 
array 
would show exactly one character. There was a sensitivity adjustment which 
would set the darkness of the line which would trigger a pin to start 
vibrating, and also a switch to flip between dark-on-light and light-on-
dark.

The Optacon does show that, with a bit of getting used to, one can learn to 
move one hand over the material while reading with the other, stationary, 
hand. 
There's one thing, however, which I believe made a huge difference. This is 
that the image presented on the array was always what was exactly under the 
camera, which means that it moved as the camera moved. I'm suspecting that 
it'd 
be a lot more difficult if the character simply switched from one to the 
next.

-- 
Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God.
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