Sensory aids for the blind

Details Sensory aids for the blind Sensory aids for the blind

1975-01-15

1976-10-19

Farley, Richard A.

Communications: electrical

Selective

340 3FM, 343 5SM, G01S 968, G01S 754

Patent

active

039874036

ABSTRACT:
A sensory aid for the blind in which a frequency swept ultra-sonic carrier signal is generated and radiated as acoustic energy from a head set and reflected acoustic energy is received by two spaced apart receiving transducers which feed a two channel receiver. The receiving transducers have divergent polar lobes which in combination with the polar lobe of the transmitting transducer simulate the characteristics of a normal human auditory system. The carrier signal is multiplied with each received signal to produce respective beat frequency signals each of which have a frequency and level which is dependant on the range and direction respectively of the source of reflection with respect to the user. The gain of both channels is controlled synchronously by controlling the level of the carrier signal multiplied with each received signal. The range of gain control can be increased by feeding the transmitting transducer with the controlled level carrier signal.

REFERENCES:
patent: 2754492 (1956-07-01), Parker
patent: 2959674 (1960-11-01), O'Meara
patent: 2984741 (1961-05-01), Bronstein et al.
patent: 3366922 (1968-01-01), Kay
patent: 3742433 (1973-06-01), Kay et al.

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