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