Access to information normally supplied through one sensory modality by recoding it for another. Successful use can restore a function without restoring the missing receptor system or establishing ordinary experience in that modality. Device engineering, learning and subjective reports address different aspects.
An apparatus capturing, transforming and presenting information through an available sensory channel. Evaluation must distinguish transmitted resolution from human recoverability, and laboratory identification from practical use.
A camera-to-sound sensory-substitution system developed by Peter B. L. Meijer. Its column scan encodes vertical position by frequency, horizontal position by scan timing and image brightness by amplitude. Later implementations add other cues; properties of one version should not be attributed to every prototype.
A rule converting image properties into acoustic features. One column-scanning example assigns vertical row to , horizontal column to scan time, and brightness to amplitude , yielding . Distinct orthogonal tones can preserve column coefficients in ideal conditions, while finite windows, masking and limited hearing resolution constrain perception.
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