From: utzoo!decvax!cca!knutsen@sri-unix
Newsgroups: net.followup
Title: Re: Re: sightless navigation - (nf)
Article-I.D.: sri-unix.3915
Posted: Wed Oct 20 17:40:52 1982
Received: Thu Oct 21 04:41:39 1982

#R:rabbit:-80300:sri-unix:7300002:000:572
sri-unix!knutsen    Oct 20 17:04:00 1982


	I saw a real device on TV a year or two ago that was worn like
glasses and sent out ultrasonic signals.  The wearer was fed a tone
proportional in frequency to the frequency shift of the received signal
(the echo).  I think it was also proportional in amplitude to the
amplitude of the echo.  (This is similar to the doppler radar the
military uses.) It was done in stereo, and the result was an ability to
locate objects and tell their speed.  They showed someone (blind)
walking down a pretty crowded street with one on.  Havent heard of it
since tho.

Andrew Knutsen