文本内容:
第章离散傅里叶变换9习题九
9.2-11X0=0,X1=2-2j,X2=0,X3=2+2j2X0=0,X l=4,X2=0,X⑶=01kN时,,;3c=l X0=NXk=Sn=o=0/c=1,2,…N—1一恤i1-cNwgN_1—cN时,,W1Xk=k=0,1,…N-11-cW/^-1-cW^k=1N/2jk=N-1⑷X/c=-N/2Jcother
09.2-2Xk={0,0,4,0,0,0,4,0}
09.5-2{b3,3,3,2,0}当…,时,
9.5-31k=l・r,1=0,1,N-l Yk=Xk/r//上\“一,]11sink⑵当丹时,丫幻=与匕尉哥k r2q*£0Yk=XkNRFNk
9.5-4Xk=l;Yk=
0.
59.5-5l20ms;
20.5ms;340;
4809.7-1。