X(k)=X(rk,+ko)=X(k,ko)=2x(n)wN ∑∑x(n1+n。) (2n+0)(k+k) 0=01=0 ∑∑x(n1,n)WNW何 0=0n1=0 ∑x(mn,n)H WnWw团 i ∑[X(k k. n )W noko w o =∑X1(kn)Wm=X2(,k) o=0        1 1 1 0 1 0 0 , N nk N n X k X r k k X k k x n W             2 1 2 1 0 1 1 0 0 1 1 1 2 1 0 0 0 r r r n n r k k N n n x r n n W            2 1 2 1 0 1 0 1 0 0 1 2 1 1 0 1 1 1 1 0 0 0 , r r r n k r n k n k rr n k N N N N n n x n n W W W W         2 1 1 0 0 0 0 1 1 2 0 1 1 1 1 0 0 0 , r r n k n k n k r N r n n x n n W W W                     2 0 0 0 1 2 0 1 1 0 0 0 , r n k n k N r n X k n W W            2 0 1 2 0 1 ' 1 0 0 2 0 1 0 , , r n k r n X k n W X k k     