Multiple Vbrtical Panningを用いた立体音響システムのための聴取実験

摘要

In this paper, the novel three-dimensional (3D) audio system is proposed. The proposed system is based on Multiple Vertical Panning (MVP) method and matches to the glasses-free 3D video display system in which the size of screen is very large. The vertical position of sound images is synthesized by the panning between two loudspeakers placed at the top and bottom of screen. The horizontal position of sound images is controlled by the position of two loudspeakers. By the proposed system, multiple listeners can simultaneously feel the sound images at the position of 3D objects depicted by the video display system. In order to evaluate the auditory performance of the proposed system, the listening test was designed by using the loudspeaker array in which twenty-seven loudspeakers were aligned on the vertical line. Sound images were synthesized by the panning between two loudspeakers placed at the top and bottom of the loudspeaker array. Twelve listeners listened to a sound and reported the position of synthesized sound images. As a result, it was indicated that listeners could feel the synthesized sound images at the position between two loudspeakers placed at the top and bottom of the loudspeaker array.%本報告では，大画面裸眼立体映像提示システムに適合するために，Multiple Vertical Panning（MVP）方式に基づいた新たなる立体音響システムを提案する.音像の垂直位置はスクリーンの上下に配置した2つのスピーカ間のパニングによって合成する.音像の水平位置は2つのスピーカ対の位置によって制御する.これにより，複数の聴取者が同時に映像提示システムによって描写された立体像の位置に音像を感じることができる.提案システムの聴覚性能を評価するために，垂直軸方向に27個のスピーカを配置したスピーカアレイを用いて聴取実験を行った.スピーカアレイの上部と下部に配置した2個のスピーカの間でバニングを行い，音像を合成した.12名の聴取者に音を聴かせて合成音像の位置を回答させたところ，聴取者たちはスピーカアレイの上部と下部に配置した2個のスピーカの間の位置に合成音像を感じていることが分かった.