Recently we have developed a novel stage design system, which can present different vibro-auditory information to each member of audience. The system is composed of the ultrasonic speaker and the moving controller. The speaker delivers ultrasonic wave, which is modulated with the audible frequency. The wave travels straight like a beam, and when it encounters an object, the object is vibrated with the audible modulation frequency. The speaker, therefore, can directly and selectively present sounds to the audience, and it can generate a virtual sound source anywhere in the installation space such as a wall, a screen, or even performer's body. Although the speaker is generally fixed and the direction of the "sound spot" is limited, we attached the ultrasonic vibration component of the speaker to the top of a moving light housing to control the direction of the sound beam in real time. This Moving Ultrasonic Speaker (MUS) was used in the multi-media performance entitled "Living Lens" on 15, 16, 17 July 2006, as a part of Brisbane Festival 2006. In this paper, we give an outline of this stage design technique, and propose a concept of "Vibro-scape Design" in the performing art stages.
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