To date it requires that the system be trained to recognize the user's voice, which may of course change when the user has a cold. Furthermore the system works best when the words are enunciated separately rather than continuously as in normal speech. In general as with most AI type applications it works best when the domain of discousre is suitably restricted. Speech generation on the other hand is much easier and can be used quite effectively. Displays For many tasks monochrome displays are quite adequate, especially when they have high resolution.
Color displays do offer more opportunities for multimedia, as well as for clutter.
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