5.2 System Representation with signal flow-graph Unit delay x(n) x(n-1) x(n) x(n 2 Multiplier xr(n ax(n) Adder x1(m)+x2(m) x1(m) ·x1(n)+x2(m)5.2 System Representation with signal flow-graph z － 1 x(n) x(n－ 1) x(n) ax(n) a x 1 (n) x2 (n) x 1 (n)＋x 2 (n) x(n) z x(n－ 1) － 1 x(n) a ax(n) x 1 (n) x2 (n) x 1 (n)＋x 2 (n) Unit delay Multiplier Adder