An assistive device designed to deliver voice output based either in the reproduction of previously-recorded natural speech and/or on an electronic synthesized voice following a pre-established set of pronunciation rules. It typically consists of an electronic unit with a keyboard and screen; the keyboard may include letters, symbols, or both. The device is often customized to meet the user?s needs and is mostly used by patients with disabilities that partially or totally impair voice capabilities, including chronic progressive diseases.
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