Abstract
The sensory parameters of the ultrasonic binaural spatial sensor for use by blind persons are discussed. These comprise (1) the distance cue coded in kHz/m which can be varied from 1 kHz/m for long (5m) range use to 10 kHz/m for short (0.5 m) range use; (2) the direction cue coded in binaural intensity difference in dB/degree and may be varied in practice from 0.2 to 1 dB/degree giving either a compressed expanded angular resolution; (3) the field of view which may be wide (120°) or narrow (10°). These parameters are discussed to show what choices are available in deciding on the parameters of an aid to be used by a blind baby. It is shown that the effect of motion causing Doppler shifts can be minimized in a baby's aid and greater resolution obtained by the appropriate choice of sensory parameters. It would seem that specialists, similar to opticians or audiologists, are needed in this field to make the choices and fit the sensory aid. Results of work with babies and young children will be discussed.
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