Ultrasonic rangefinder + tone generator = assistive tech
Some existing systems and issues:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.159.7908&rep=rep1&type=pdf
http://wiseadvice.wordpress.com/2008/02/04/high-cost-of-assistive-devices-for-blind-people-is-onerous/
http://www.afb.org/section.asp?SectionID=4&TopicID=31
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