Narrow area control for individual sound image generation by combining NBSFC and liner loudspeaker array

In this paper, we propose a method for reproducing different sound for multiple users by forming a narrow area, where the users can listen only the desired sounds. We have proposed a sound field control method for narrow area by combining Null-space Based Sound Field Control (NBSFC) and liner loudspeaker array. NBSFC filtering can suppress the sound pressure on the each control point and maintain the sound pressure around the user’s ear. However, consideration of the effective arrangement of control points was insufficient. Therefore, we aim to improve the reproduce performance of individual sound image generation by optimizing the arrangement of control points. The numerical simulation showed that the averaged power difference between desired and undesired area is by about 2 dB by the proposed method.