Communications: electrical – Selective
Patent
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.
LandOfFree
Sensory aids for the blind does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sensory aids for the blind, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensory aids for the blind will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-105630