Availability and Accessibility in Whole Utterance-Based Devices Synthetic speech output can be produced with AAC devices by constructing a message at the time it is required or by retrieving a previously stored message. Though both of these modes of speech generation can co-exist in the same device, typically one or other mode is predominant in a given ... Article
Article  |   December 01, 2001
Availability and Accessibility in Whole Utterance-Based Devices
Author Affiliations & Notes
  • John Todman
    University of DundeeUnited Kingdom
Article Information
Articles
Article   |   December 01, 2001
Availability and Accessibility in Whole Utterance-Based Devices
SIG 12 Perspectives on Augmentative and Alternative Communication, December 2001, Vol. 10, 8-11. doi:10.1044/aac10.4.8
SIG 12 Perspectives on Augmentative and Alternative Communication, December 2001, Vol. 10, 8-11. doi:10.1044/aac10.4.8
Synthetic speech output can be produced with AAC devices by constructing a message at the time it is required or by retrieving a previously stored message. Though both of these modes of speech generation can co-exist in the same device, typically one or other mode is predominant in a given device. Each mode of delivery is associated with particular difficulties. In the case of online generation of a message, although complete flexibility is possible in principle, message construction time, even with word prediction assistance, is generally too long to satisfy the temporal requirements of effective conversation. In consequence, such messages tend, in practice, to be extremely brief and the AAC user has difficulty initiating topics or sharing fully in the control of topic development. For whole utterance-based devices, on the other hand, complete pre-stored messages can be retrieved and output with a few selection moves, possibly as few as one to four moves. This has the potential to increase conversational rate substantially. This potential is seldom realized, however, because the precise message that is required is often not available because it has not been stored or, though available, is not accessible because the user does not remember that it was stored or in what location it was stored.
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