Developed by the Future Interfaces Group (FIG), a research lab at Carnegie Mellon University, SkinTrack is a wearable system that tracks skin touch to interface with a host. The system consists of a ring and a sensing wristband with multiple electrodes. The ring emits a continuous high frequency AC signal and based on the inherent phase delay in a high-frequency AC signal propagating through the body, a phase difference can be observed between pairs of electrodes. With these phase differences as the input, SkinTrack can compute the 2D finger touch coordinates. Researchers say the approach can segment touch events at 99% accuracy and resolve the 2D location of touches with a mean error of 7.6mm.
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