A second pair of {HEAD ~ analog signals} representing the difference and {TAIL ~ sum} of the pairs of analog signals is generated and presented to a signal processing circuit in combination with the first pair of phase quadrature signals 
A second pair of { HEAD ~ analog signals } representing the difference and { TAIL ~ sum } of the pairs of analog signals is generated and presented to a signal processing circuit in combination with the first pair of phase quadrature signals
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH 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