Simulation of Small Head-Movements on a Virtual Audio Display Using Headphone Playback and HRTF Synthesis
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Correct determination of sound source location often fails during headphone playback in virtual simulation. Among other cues, small movements of the head are considered to be important in free-field listening to avoid in-the-head localization and/or front-back reversals. Up-to-date virtual reality simulators are able to locate the head's actual position, and through proper feedback, real-time update of the actual HRTFs can be realized for a better spatial simulation. This study uses the BEACHTRON sound card and its HRTFs for simulating small head-movements by randomly moving the simulated sound source to emulate head movements. This method does not need any additional equipment or feedback. Results of a listening test with 50 subjects demonstrate the applicability of this procedure focusing on resolving in-the-head localization and front-back reversals. The investigation was made on the basis of the former GUIB (Graphical User Interface for Blind persons) project.