The phrases can be written with a physical keyboard, or selected from an on-screen keyboard by pressing on a touch screen, pointing and clicking a mouse, by head tracking mouse, eye gaze systems, joystick, and by scanning with a mechanical control switch. Text-to-speech refers to speaking messages written in letters and words and spoken by a computer-generated, synthesized voice. Many rate enhancements, like abbreviation/expansion, word prediction, stored phrases, and dialog scripts, help the user compose messages quickly, thus speeding up conversations. Messages that are typed out by the user are read aloud by the device. These products are voice output systems for people who are able to spell out what they want to say.
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