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Amazing haptic speaker lets visually impaired people read braille in midair

This is not a new article, but has been in my bookmarks since May 2020. Researchers at Bayreuth University in Germany have developed a speaker system which emits ultrasound waves that allow people to read braille in mid-air. The research is particularly pertinent during this coronavirus pandemic, where avoiding touching public surfaces is generally a good thing!
The technology is made up of a 16×16 grid of speakers, and can detect a hand up to a distance of 70cm.
You can read the full academic study, “HaptiRead: Reading Braille as Mid-Air Haptic Information“.
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