z-transform pairs 9,aa时ocH时 [cosai4[-e"+eau"4网 1 0bnan小T5FRo0ca 30
30 z-transform pairs 1 0 0 1 2 0 1 cos cos , : 1 1 2 cos z n u n ROC z z z − − − − − + 1 0 0 1 2 0 sin sin , : 1 1 2 cos z n u n ROC z z z − − − − + 0 ( ) cos 1 0 0 2 j n j n n u n u n e e − = + ( 0 0 1 1) 1 1 1 2 1 1 j j e z e z − − − + − − 9. 10
z-transform pairs 1-rcosaz 1.cosa[网k>12osaE产.0C:pr [r"cosavjuev+re)uir] zth心e列 2w啊in0c中 31
31 z-transform pairs ( ) 0 0 0 1 cos 2 n n n j n j n r n u n r r u n e e − = + ( 0 0 1 1) 1 1 1 2 1 1 j j re z re z − − − + − − 1 0 0 1 2 2 0 1 cos cos , : 1 2 cos n r z r n u n ROC z r r z r z − − − − − + 1 0 0 1 2 2 0 sin sin , : 1 2 cos n r z r n u n ROC z r r z r z − − − − + 11. 12
z-transform pairs 1.02d,oc0 0,otherwise 32
32 z-transform pairs 1 , 0 1 1 , : 0 0, 1 n N N a n N a z ROC z otherwise az − − − − − 13
单选题1分 设置 If the unit circle is included in the ROC of the z-transform H(z)of sequence h[n](h[n]is the impulse response of a system),then A the Fourier transform of h[n]doesn't exist, and the system is not stable.. the Fourier transform of h[n]exists,and the system is stable. the Fourier transform of h[n]maybe exist,maybe don't;and the system may be stable,may be not 提交 33
33 If the unit circle is included in the ROC of the z-transform H(z) of sequence h[n] (h[n] is the impulse response of a system), then the Fourier transform of h[n] doesn’t exist, and the system is not stable.. the Fourier transform of h[n] exists, and the system is stable. . the Fourier transform of h[n] maybe exist, maybe don’t; and the system may be stable, may be not . . A B C 提交 单选题 1分
3.2 Properties of the ROC for z-transform Property 1:The ROC will either be of the form 0≤r<z,orz<r≤oo,or,in general the annulus,,i.e,0≤R<z<h≤o, 9m z-plane 乎m 3-plane gm z-plane R R Re e e 34
or, in general the annulus, i.e., ◆Property 1: The ROC will either be of the form 3.2 Properties of the ROC for z-transform 0 . R L r z r R r L r 0 R r z ， L or z r ， R r L r 34