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