同样,令 E(k)=∑x(4+1)W k=0.1 4.216) Flk x(4C+3)W ck k=0,1,… (4217) 则有: B(k)=E(k)+WF(k)k=0,1,… 4218) k+ N\=E( )-WkF(k)k=0,…y4-1 4.219)同样,令 则有:( ) ( ) 1 4 4 1 0,1, 4 1 4 = + = − −= E k x W k k N N N o ( ) ( ) 1 4 4 3 0,1, 4 1 4 = + = − −= F k x W k k N N N o (4.216 ) (4.217 ) ( ) ( ) ( ) 1 4 0,1, 2 B k = E k + W F k k = N − kN (4.218 ) ( ) ( ) 1 4 0,1, 4 2 = − = − + E k W F k k N N B k kN (4.219 )