DEVICE FOR ORIENTATING BLIND PERSONS IN OPEN COUNTRY Russian patent published in 1997 - IPC

FIELD: technical means for rehabilitation of disabled persons. SUBSTANCE: blind person to be guide carries on his body device comprising control signal generating unit made in form of geomagnetic angular transducer, control signal processing unit, and two acoustic emitter. Control signal processing unit consists of presetting multivibrator connected in series to linearly increasing signal generator, and to two channels, viz. left- and right-hand ones. Each channel comprises, connected in series, comparator, univibrator, multiplier and matching amplifier. Output of said linearly increasing signal generator is connected to inputs of comparators in both channels. First and second outputs of said angular position transducer are connected to second inputs of comparators of, respectively, left-and right-hand channels and to second input of multiplier of, respectively, right- and left-hand channels of said control signal processing unit. Output of said matching amplifier of left- and right-hand channels of said control signal processing unit is connected to inputs of, respectively, left- and right-hand acoustic emitters. EFFECT: blind person obtains means for orientation in open country. 1 dwg