Distance control of sound images by a two-dimensional Ioudspeaker array.

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Abstract

A new method of sound-image distance-control using a loudspeaker array is discussed. It is shown that a stable sound image can be localized in front of the loudspeaker array. An audio signal is fed to the loudspeakers of the array with appropriate time delays so that the sound waves from the loudspeakers focus at one point between the listener and the loudspeakers. The sound pressure is very great near the focal point, and spherical equal-phase contours are synthesized from this focal point. The results of subjec tive evaluation of sound image distance using an experimental loudspeaker array show that a stable sound image is actually perceived near the focal point. Moreover, the direction of the sound image is little affected by motion of the listener's heads. This indicates that the focal point is perceived exactly like a real sound source. With this method, a sound image can be localized at the distance of the corresponding video image in 3D TV.

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