The ultrasonic sensory array unit has two-dimensional ultrasonic
receivers and one transmitter. The transmitter positions
the center of the receiver’s array and irradiates an ultrasonic
to the measured object. The signal processing unit extracts
the features of the measured object from the sensor array outputs
using the signal processing circuit. The extracted data
is inputted into the identification unit. The identification unit
consists of two types of neural networks that perform shape
identification and material identification, respectively.