Longitudinal Acoustic Image Position Movement Perception in Spatial Audio Projection with Delay

－a Case of Pop Music－

Abstract

In this study, the perception of moving sound images is named " Acoustic Image Position Movement Perception", and the purpose of this study was to clarify the conditions that cause the perception of sound image movement to a longitudinal angle. The experiment used a short song phrase in the form of a band ensemble. The guitar part was used as the direct sound, and the phrase created with a delay added to the guitar part was used as the reverb sound. These sound sources were placed in the spatial audio system, and their perceptions were studied. As a result of the experiment, there was possibility to induce the perception of the Acoustic Image Position Movement Perception away from the listener by setting the DR ratio to 0dB. On the other hand, when the DR ratio was not 0 dB, there was suggested to induce the Acoustic Image Position Movement Perception in the direction closing to the listener. When the DR ratio was set to -6 dB, there was possibility could induce the Acoustic Image Position Movement Perception in a direction other than the direction in which the indirect sound originally arrived.