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5. Physically Disabled
There are a wide range of physical disabilities that can impair a user's mobility, and many of these impairments need to be addressed on an individual basis. This section addresses impairments that apply to users who have difficulty using a mouse, pointing device, or keyboard.
5.1. Keyboard Navigation
There are features that are built into the Linux operating system that allow for additional keyboard configuration. In some of the X Windows desktops these settings can be changed from the control center. An application has also been developed for X Windows called AccessX and it provides a graphical user interface for configuring all the AccessX keyboard settings. These settings are:
StickyKeys enable the user to lock modifier keys (for example, control and shift) allowing single finger operations in place of multiple key combinations.
MouseKeys provide alternative keyboard sequences for cursor movement and mouse button operations.
SlowKeys requires the user to hold the key down for a specified period of time before the keystroke is accepted. This prevents keystrokes that are pressed by accident from being sent.
ToggleKeys sound an audio alert that warns the user that a keystroke created a locking state for keys, such as Caps Lock, and Num Lock.
RepeatKeys allow a user with limited coordination additional time to release keys before multiple key sequences are sent to the application.
BounceKeys or Delay Keys have a delay between keystrokes. This function can help prevent the system from accepting unintentional keystrokes.
5.2. Assistive Technologies for the Physically Disabled
The following is a list of assistive technologies for the physically disabled:
5.2.1. On-Screen Keyboard
On-screen keyboards enable a user to select keys using a pointing device, such as a mouse, trackball, or touch pad. This application can be used in place of a standard keyboard.
GTkeyboard is a on-screen, graphical keyboard and can be downloaded at: http://opop.nols.com/gtkeyboard.html.
GNOME Onscreen Keyboard (GOK)is a on-screen, graphical keyboard that enables users to control their computer without having to rely on a standard keyboard or mouse. MOre information is available at http://www.gok.ca.
5.2.2. Speech Recognition
Speech recognition utilities are used by people with mobility impairments, so they can operate the computer using voice control.
Open Mind Speech is a development project for speech recognition tools and applications. Information for the project and a mailing list are available at: http://freespeech.sourceforge.net/.
ViaVoice Dictation for Linux allows you to write documents using your voice rather than a keyboard. Information and downloads are available at: http://www-4.ibm.com/software/speech/dev/.
This site has information and links related to several different speech recognition utilities. http://www.trace.wisc.edu/world/computer_access/unix/unixshar.html.
5.3. Additional Resources
The following is a list of additional Web sites that may be of interest to users with mobility impairments:
This site provides a kernel patch that can be downloaded to enable a one-handed keyboard. The download is available at: http://www.fourtytwo.de.
Configuration and information on Adapting the Linux Keyboard for a one handed user is available at: http://www.eklhad.net/linux/app/onehand.html.
Morseall allows the user to control a Linux shell by tapping Morse code on the left mouse button: http://sourceforge.net/projects/morseall.
The keyboard and console HOWTO provides additional keyboard configuration information. http://www.ibiblio.org/pub/Linux/docs/HOWTO/Keyboard-and-Console-HOWTO.
There is a Speech Recognition HOWTO, written by Stephen Cook that provides complete details for anyone interested in learning more about speech recognition applications. http://www.linuxdoc.org/HOWTO/.
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Generated: 2007-01-26 17:58:13