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