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This is based on older idea of ultrasonic stick for blind.
An ultrasonic beam scans horizontally continuously and
reflects backs whenever faced with an obstacle. Blind
person wears a headphone. If an obstacle is in the middle
it gives a beep equally in both speakers of headphone. If
is on the right only right speaker beeps. Same for
left. Similarly if obstacle is 20 % left of the middle then
proportionately strength of beep is more in left speaker
and less in right.
Thus by using stereophonic beeps, one can get an idea of
position of an obstacle relative to center line.
Similarly strength of beep can give an idea of vertical
position of the obstacle.
This never gets old, does it? [DIYMatt, Dec 14 2010]
||You did google 'ultrasonic vision blind' did you not?
||Just put the words ultrasonic, vision and blind into Google.
||WAY cool [DIYMatt!!] I haven't seen that!! Thanks for letting me see somthing new!!