Microsoft looks to be on a bit of a hot streak with innovations lately, and though this here project hasn't received much hype (yet), we'd say it's one of the most ingenious user interface concepts we've come across. Skinput is based on an armband straddling the wearer's biceps and detecting the small vibrations generated when the user taps the skin of his arm. Due to different bone densities, tissue mass and muscle size, unique acoustic signatures can be identified for particular parts of the arm or hand (including fingers), allowing people to literally control their gear by touching themselves. The added pico projector is there just for convenience, and we can totally see ourselves using this by simply memorizing the five input points (current maximum, 95.5 percent accuracy), particularly since the band works even if you're running.
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