y()=x()+h()=[")1g()-=xm)(n-m) =∑a"(m)Bu(n-m)=B"∑a".B-m,u(m)u(n-m) =一 B-a B 7-33略( ) ( ) ( )  ( )  ( ) ( ) ( ) ( ) ( ) ( ) ( )                    − − = −         − =  = =  − =    − =  =  =  − + + = + −  =− −  =− −  =−     1 1 0 1 1 1 n n n m n n m m n m n m m m m n m m n n u m u n m u m u n m y n x n h n u n u n x m h n m 7-33略