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