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Voice Output Communication Aid

Voice output communication aids (VOCAs) or speech generating devices (SGDs) are electronic devices which enable the user to speak.

The simplest VOCAs store a single pre-recorded message, which is produced in the form of digitised speech when the person using the device presses a button, switch, or key.

The most elaborate VOCAs include software that allows users to create and combine words to produce novel utterances in the form of computerised synthetic speech.

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