The spatial auditory masking effect caused by real sound source signals in a three-dimensional sound field has been previously examined . However, in this study, spatial auditory masking caused by a phantom sound image generated by multiple sound sources in a 3D sound field was investigated. We have examined masking threshold levels for various phantom masker locations at maskee locations of 360° around a listener. The results were closely comparable to those where the real masker signals were employed. According to the test results, it was deduced that spatial auditory masking occurs in accordance with the sound image locations rather than the sound source device locations.
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