5.1 y(n) X(n) Z-1 Z-i -0.5 1.5 0.2 Z1 4 2 -0.5 Z-1 -0.2 1 Z-1 0.8 25.1 X(n) y(n) 1.5 -0.5 -0.5 2 41 2 -0.2 0.8 0.2 Z - 1 Z - 1 Z - 1 Z - 1 Z - 1