G=4 Cx11=0.5 C21=0 c2=-0.9x2=-0.8 Yo1=0.2711=0 Y2=1 Y12=0.3 则并联结构： x(n) 0.2 0.5 -0.9 0.3 -0.8 图P5-3 2024/10/21则并联结构： 0 G = 4 11 = 0.5 21  = 0 01  = 0.2 11  = 0 12  = −0.9 22  = −0.8 02  =1 12  = 0.3 2024/10/21 7