同理:X(k)=Xm()+X2(k) 其中:X()=x(N=k)R(k) =1/2X()+X(N-k)]R(k) Xo(k)=-Xo((N-kN RN(k) =1/2X()-X(-k)]R(k
* ( ) (( )) ( ) X op op N N k X N k R k * 1/ 2[ (( )) (( )) ] ( ) X N N N k X N k R k ( ) ( ) ( ) X ep op 同理： k X k X k * 1/ 2[ (( )) (( )) ] ( ) X N N N k X N k R k * ( ) (( )) ( ) X ep ep N N 其中： k X N k R k
Q共轭对称性 序列 DFT X(k) Relx(n)i X0(k) jInx(nI Xon(k) x(n RelX() jImIX(k)I
序列 DFT 共轭对称性 x(n) X (k) Re[ ( )] ( ) ep x n X k Im[ ( )] ( ) op j x n X k ( ) Re[ ( )] ep x n X k ( ) Im[ ( )] op x n j X k