In a binary system, the value Δe is generally arbitrary, but necessarily depends on the level of noise signals, i.e., {HEAD ~ a selected value} of {TAIL ~ Δe} that is too low may allow noise to be detected as an edge 
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In a binary system , the value Δe is generally arbitrary , but necessarily depends on the level of noise signals , i.e. , { HEAD ~ a selected value } of { TAIL ~ Δe } that is too low may allow noise to be detected as an edge
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH