Echo location system for vision-impaired persons

Details Echo location system for vision-impaired persons Echo location system for vision-impaired persons

1991-04-22

1992-04-21

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 99, G01S 1500

Patent

active

051074672

ABSTRACT:
Echo locating apparatus for a vision-impaired person which includes: a sound emitter for emitting a stream of sound bursts of ultrahigh frequency; at least one receive channel having a microphone for receiving echoes of the sound bursts and generating echo signals; an echo profile detector for generating an echo profile signal of each echo signal; a delay circuit for adding a variable delay to the echo profile signal, wherein the variable delay increases with the distance to the reflecting at a diminishing rate of increase. The sound burst emitter is preferably arranged to emit a beam of sound bursts having a given beam angle that can be pointed in any direction.

REFERENCES:
patent: 2500638 (1950-03-01), Krauth
patent: 2580560 (1952-01-01), Larsen
patent: 3366922 (1968-01-01), Kay
patent: 4292678 (1981-09-01), Kay
patent: 4712003 (1987-12-01), Ban et al.
patent: 4761770 (1988-08-01), Wonky
patent: 4907136 (1990-03-01), Jorgensen

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