Thus, if the reference element is a binary 1 and the data bit detected is a binary 1, the appropriate logic circuit 60-1, 60-2 . . . 60-N outputs a binary 1 signal on the corresponding line 70-1, 70-2 . . . 70-N to the P input of the corresponding flip-flop 34-1, 34-2 . . . 34-N to preset the flip-flop to the binary 1 state.