Developed by researchers from Switzerland, Italy, Germany, France and the UK, Tai-Chi (Tangible Acoustic Interfaces for Computer-Human Interaction) is a system that can transform any real object into a touch-sensitive computer interface. A computer is used to read values via piezoelectric sensors which are attached to the object. A recent paper from Design 2006 discusses the system in further detail:

Principally, there are two kinds of stimulation of physical objects: passive and active modes. In the passive mode any change in the acoustic properties of an object, due to its vibration as a consequence of interaction (knocking, tapping etc.), is detected and then used to estimate the location of the interaction. With regard to the active mode, the absorption of acoustic energy at the contact point of an object surface must be ascertained.

Currently there are three passive methods under investigation for tangible acoustic interfaces: time delay of arrival (TDOA), time reversal and acoustic holography.

The paper discusses the implementation of Acoustic Holography using the Rayleigh-Sommerfeld algorithm. The following is an audiovisual installation called Sound Rose using the Tai-Chi system.

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