To design efficient binaural rendering systems for 3D audio, its important to understand how delays in updating the relative directions of sound sources in response to a listeners head movements affect the sense of realism. However, sufficient research on this problem has not yet been conducted. Herein we investigate the delay detection capability (threshold) of hearing during localization of audio objects. Moving sound sources emitted from loudspeakers can emulate a smooth update of head related transfer functions (HRTFs) or a delayed update of HRTFs. Specifically, we evaluate the delay detection threshold with different bandwidths, directions, and speeds of sound source signals. The delay detection thresholds in this experiment are approximately 100 ms to 500 ms. The detection thresholds depend on both the bandwidth and the sound source direction. However, the speed of sound source movement has a negligible impact on the detection threshold.
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