[Show abstract][Hide abstract] ABSTRACT: The use of a tracking method for developing a directional-view display system with directional sound is described. The proposed system allows an individual to experience directional sound in a multi-view display environment. A projection-type display system is used, because a high definition display and large size display screen can be easily realized. We implemented a tracking system with an infrared camera and infrared light emitting diodes to track the viewers' positions. A viewing zone analysis that permits complete separation between neighboring view images to be calculated and experimental results for two observers are presented.
IEEE Transactions on Broadcasting 07/2011; · 2.09 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: If you knock an object, it sounds. If you play music, loudspeakers sound. The sound you usually listen to is generated by actions or objects supposed to generate sound. However, the development of parametric loudspeakers made it possible for people to feel that the sound comes from actions or objects which are not supposed to generate sound, because the parametric loudspeaker can localize the sound image on the reflected surface. The parametric speakers work in an entirely different way from conventional loudspeakers. They generate ultrasound, and it travels out from a parametric loudspeaker in a narrowly focused column like a flashlight beam. When it hits something, it turns back into ordinary sound you can hear. There is a computer interface using this characteristic of the parametric speaker.
[Show abstract][Hide abstract] ABSTRACT: In this review paper, we examine some of the recent advances in the parametric acoustic array (PAA) since it was first applied in air in 1983 by Yoneyama. These advances include numerical modelling for nonlinear acoustics, theoretical analysis and experimentation, signal processing techniques, implementation issues, applications of the parametric acoustic array, and some safety concerns in using the PAA in air. We also give a glimpse on some of the new work on the PAA and its new applications. This review paper gives a tutorial overview on some of the foundation work in the PAA, and serves as a prelude to the recent works that are reported by different research groups in this special issue.
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