设:Nn(s)=(S-S 01(~c* 01 H1(s)=(s 01人S-S, )H(s) N,S=(S+ Sou(s+So H2(s)=(S+s01)(S+so1)H(s) S-Sou(S-S H1(s)= )( *(S+SOD(S+Sou H(s) s+s 01人( S 01 H2(S)4s)( ) ( )( ) ( ) ( ) ( )( ) ( ) ( )( ) ( ) ( ) ( )( ) * 2 0 1 0 1 * 0 1 0 1 * 1 0 1 0 1 * 0 1 0 1 H s s s s s H s N s s s s s H s s s s s H s N s s s s s b a = + + = + + = − − 设 ： = − − ( )( ) ( ) ( )( ) ( )( ) ( ) * * 0 1 0 1 0 1 0 1 * 0 1 0 1 1 s s s s H s s s s s s s s s H s + + + + − − = ( ) ( ) 2 = H s H全 s