Sonar sticks use ultrasound to guide blind people
2014-06-22, 08:06 PM,
#1
[Image: 140618135417-smartcane-recrop-horizontal-gallery.jpg]

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(CNN) -- "On the streets the sidewalks are cluttered with street vendors, animals, streetlights and other obstacles which make them uncomfortable even for sighted people," explains Professor Meenakshi Balakrishnan, a computer engineer at the Indian Institute of Technology, in Delhi.
Balakrishnan heads the team behind the "Smartcane," a new device using ultrasound to guide the visually impaired through the busy streets of India by building upon the widely used white cane.
"A white cane is an excellent device, providing a lot of information to users," he says. "But it is poor at detecting obstacles that are above waist height and do not have a touch-point on the ground, such as a tree branches sticking out into your path."

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