For biphase encoding, if {HEAD ~ the difference} in {TAIL ~ closer to 0°}, then the receiver outputs a first bit, and if the difference is closer to 180°, the receiver outputs a second bit 
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For biphase encoding , if { HEAD ~ the difference } in { TAIL ~ closer to 0 ° } , then the receiver outputs a first bit , and if the difference is closer to 180 ° , the receiver outputs a second bit
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH