Because {HEAD ~ the outputs} of {TAIL ~ A/D} converters 1164 and 1169 are represented in twos complement notation, the accumulators 1175, 1176, 1177 and 1178 effectively carry out addition or subtraction by performing only adding operations 
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Because { HEAD ~ the outputs } of { TAIL ~ A / D } converters 1164 and 1169 are represented in twos complement notation , the accumulators 1175 , 1176 , 1177 and 1178 effectively carry out addition or subtraction by performing only adding operations
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH