y(m)=1(Mm)=(m) Y(z)=∑y(m)zm=∑v(Mm)z Y(=)=>w(m) m/m ∑ W(〃2 jiM/M m/m ∑ 训e j2/m/m M2=0L ∑H(e-n2mM 之14y(m)= w (Mm)= w(Mm) ( )  ( )  ( )  =− −  =− − = =  m m m m Y z y m z w Mm z ( ) ( ) ( ) ( )  ( )      − = − − =  =− −  =− − − =  =− − =        =       = =  1 0 2 1 1 0 2 1 0 2 1 1 1 M l j l M M M l m j l m M m M m m M M l j l m M m m M W e z M w m e z M e z M w m Y z w m z   