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