Instead, the AC signal is effectively sampled and converted to digital form at {TAIL ~ a multitude} of points in {HEAD ~ a cycle}, say 360 points, one degree apart 
Instead , the AC signal is effectively sampled and converted to digital form at { TAIL ~ a multitude } of points in { HEAD ~ a cycle } , say 360 points , one degree apart
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH