Listening tests were carried out for investigating the localization judgments of 40 untrained subjects through equalized headphones and with HRTF synthesis. The investigation was made on the basis of the former GUIB (Graphical User Interface for Blind Persons) project in order to determine the possibilities of a 2D virtual sound screen and headphone playback. Results will be presented about the capabilities and values of typical headphone playback errors as well as minimum, maximum and average values of discrimination skills. Special localization events like left-right and up-down symmetries, missing locations in vertical localization are also discussed. The measurement method includes a special 3-categorie-forced-choice MAA report on a screen-like virtual auditory surface in front of the listeners. Test signals were presented with different spectra and movement. Conclusions are drawn both for a GUIB application as well as for the binaural synthesis about the role of the fine structure of applied HRTFs.
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