The present study aims to investigate the influence of head movement on perceived externalization of a virtual sound source with various lengths of binaural room impulse responses (BRIRs). For this purpose, non-individual BRIRs were measured in a listening room and truncated to different lengths. Such modified BRIRs were convolved with speech and music signals, and the resulting binaural signals were presented over headphones. During each presentation, subjects were either asked to perform head movements or to remain stationary. The experimental results revealed that head movements can substantially improve externalization of virtual sound sources rendered by short BRIRs, especially for frontal sound sources. In contrast, head movements have no substantial influence on externalization for virtual sound sources generated by long BRIRs.
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