In order to provide access to graphics-based user interfaces for blind computer users, a spatial auditory computer display is under development which conveys the visual information embedded in the user interface in an auditory form. A spatial representation of the auditory display, based on a binaural real-time processing syst;em, is used to provide orientational information and to permit the use of multiple simultaneous verbal and nonverbal audio information. A psychoacoustic experiment was carried out with 31 participating subjects in order to investigate the ability to discriminate multiple simultaneous speech stimuli within a spatial auditory display. Localization performance and speech reception were investigated.
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