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Speech assistive devices designed to deliver voice output, based either on the reproduction of previously recorded natural speech or on a synthesized voice following a pre-established set of pronunciation rules, or a combination of both. These devices typically consist of electronic units with keyboards and screens; the keyboards may include letters, symbols, or a combination of both; some devices include dynamic screens to permit the user send complete messages using one touch. Voice synthesizer aids frequently are customized to the user\'s needs; they are used by patients with disabilities that partially or totally impair voice capabilities, including users with chronic progressive diseases.
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