设变换区间N=16,则 2 X()=∑x(m)W=∑ Sint 04元 k) ,k=0,1,…,15 sin(k) 16设变换区间N=16， 则 7 3 2 8 8 0 0 3 8 ( ) ( ) sin( ) 4 , 0,1, ,15 sin( ) 16 j kn kn n N j k X k x n W e k e k k     − = = − = = = =   