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The Importance of Phase in the Presence of Sound Source Direction

The multiple frequency wideband signals were processed using individual HRTFs to adjust the sound source direction. Main localisation cues were tested versus direction in conflict. The method previously presented through the use of the Hilbert transform enabled phase and time become independent from each other even for wideband signals. It was therefore possible to put phase in conflict with HRTF whilst leaving the amplitude characteristics unchanged of stereo signals. The results show that phase is less significant than time against direction. Furthermore the central diffuse sound field which occurs when intensity and time in conflict that reduces the localisation performance is not present when the direction and either intensity, time or phase are placed in conflict.

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