Fault tolerant sync mark detector for comparing a sign and magnitude of {HEAD ~ a detected sequence} to {TAIL ~ a target sync mark} in sampled amplitude magnetic recording 
Fault tolerant sync mark detector for comparing a sign and magnitude of { HEAD ~ a detected sequence } to { TAIL ~ a target sync mark } in sampled amplitude magnetic recording
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH