determining an instantaneous time difference between {HEAD ~ a fixed number} of {TAIL ~ sample clock transitions} at a transition of the sample clock, the instantaneous time difference being based upon a time clock having a fixed time clock period, and 
determining an instantaneous time difference between { HEAD ~ a fixed number } of { TAIL ~ sample clock transitions } at a transition of the sample clock , the instantaneous time difference being based upon a time clock having a fixed time clock period , and
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH