Echo location system for vision-impaired persons

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

1989-03-03

1990-03-06

Tarcza, Thomas H.

Illumination

With implement or hand held holder therefor

Key holder

342 24, 367 99, G01S 968

Patent

active

049071360

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 on 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 delay to the echo profile signal, consisting of the sum of a fixed delay and a variable delay that increases with the distance to the object reflecting the echo. 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: Re32252 (1986-09-01), Kay
patent: 2500638 (1950-03-01), Krauth
patent: 2580560 (1952-01-01), Larsen
patent: 3366922 (1968-01-01), Kay
patent: 3887896 (1975-06-01), Ramstedt
patent: 4041441 (1977-08-01), Johnson
patent: 4173007 (1979-10-01), McKeighen
patent: 4292678 (1981-09-01), Kay
patent: 4322829 (1982-03-01), Weber
patent: 4712003 (1987-12-01), Ban et al.
patent: 4761770 (1988-08-01), Wonky

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