Abstract
Sensory aids can be subdivided in two important ways: by modality (auditory, visual, tactile, or direct electrical stimulation) and by degree of signal processing (nonspeech, speech‐specific, feature‐extraction, and speech‐recognition). Nonspeech processing aids are designed to make maximum use of the impaired sensory system regardless of whether communication is by speech or other means. Speech‐specific processing is designed to match the average spectral and temporal characteristics of the speech signal to the characteristics of the impaired auditory system. Feature‐extraction systems involve the automatic extraction of phonetic or articulatory features from the speech signal. Speech‐recognition processing makes use of automatic speech recognition techniques to facilitate the communication process. The application of each of these different forms of signal processing to sensory aids of various kinds will be described. [Work supported by NINCDS.]
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