This paper describes a method to construct a movable virtual sound source (VSS) from a linear array of parametric loudspeakers. In the proposed method, wave field synthesis is used to construct a focused VSS at any position in air without moving the loudspeakers. The motion of the VSS can be realized by constructing VSSs successively along the moving path. Parametric loudspeakers realize a sharp directivity by exploiting the straightness of ultrasound; therefore, a VSS constructed by the proposed method is expected to be easy to perceive. Compared with a VSS constructed from conventional electro-dynamic loudspeakers, the proposed method can achieve a higher precision when the VSS is moving parallel to the loudspeaker array.
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APSIPA Transactions on Signal and Information Processing Special Issue - Advanced Acoustic, Sound and Audio Processing Techniques and Their Applications
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