Re: Vision impaired interface

From: Peter B. Maggs <p-maggs_at_uiuc_dot_edu>
Date: Thu Oct 30 2003 - 22:12:25 CST

> though. For example, the first that came to my mind was, how to
> handle write-ins - any ideas?

Write-ins present a number of different and difficult problems.

First, for voters who are good at typing. There are many examples of typing
interfaces for blind users. These interfaces for instance allow the user to
choose to type with no feedback, with line by line feedback, with word by
word feedback, or with key by key feedback. For any particular interface,
it takes a while for the users to learn the commands, but this investment
has a long term payoff. Users typically turn off most of the feedback once
they get good at the system. The voting system must be simpler, since it
should not require a long training period. A suggestion would be to give
all three - letter-by-letter, word-by-word, and end of line audible feedback
with no options . Thus if the user typed in John Smith [and then hit
ENTER], the computer would say: J O H N John S M I T H Smith [pause] John
Smith.

Then there would be an option to confirm or to go back and retry. All this
is a straightforward software coding task

For the user who is not a decent typist or can't type at all it is harder.
One approach would be to use the same system, but to substitute letter by
letter voice recognition. The user says "J" - the computer says "J - is
that right" - the users says "YES" or "NO" - etc. Are there any General
Public License voice recognition programs that could recognize the spoken
names of letters - either speaker-independent or one where the user would
have to say the alphabet for training?

Word by word recognition would be too hard, since the writein name could be
any arbitrary name. Many word recognition systems work by comparing words
spoken to expected words. But this might result in "Sharon Egger" being
transcribed as "Schwarzenegger."

Peter Maggs
p-maggs@uiuc.edu
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Received on Fri Oct 31 23:17:05 2003

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