According to the above method, since {HEAD ~ a large number} of {TAIL ~ transmission elements} is not required, it is possible to downsize an ultrasonic sensor 
According to the above method , since { HEAD ~ a large number } of { TAIL ~ transmission elements } is not required , it is possible to downsize an ultrasonic sensor
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH