Operation

Gesture Mapping

Various typical motions can be characterized by the signals coming from the drumsticks. To process these signals the gestures must be mapped to control a musical event and all the motions associated with the gesture must be captured. For instance, the start of a strike is recognized when the velocity exceeds a threshold value. At the time of minimum z of a strike, the digitized measure of the four corner signals is reported to the host. The mapping may also trigger different sounds, change the volume, pitch, tone or timbre depending on the x,y position at strike time. Analog signals from the Radio Drum are band-limited to 700 Hz. Since a human is not capable of drumming faster than once every 40 msec, the gesture signal should not be faster than 250 Hz. These characteristics are taken into consideration in the filter design and implementation. These filters are created in a program called MAX/MSP located on the host computer.

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The Radio Drum is a three dimensional motion sensing device. It uses capacitive moments sensing to determine the position of an object moving in a three-dimensional space above a surface. The goal of this project is to redesign the Radio Drum control box for UVATT with the purpose of minimizing cost and size.
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