This is accomplished according to the presently preferred embodiment by enabling the receipt of a signal from the sensors only within {HEAD ~ a particular time window} characteristic of {TAIL ~ the sensor} selected 
characteristic of
This is accomplished according to the presently preferred embodiment by enabling the receipt of a signal from the sensors only within { HEAD ~ a particular time window } characteristic of { TAIL ~ the sensor } selected
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH