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