3.1 z-Transform Z-Transform: two-sided bilateral z-transform X(2)=∑x]z=z{xm n=-00 xn Cone-sided, unilateral z-transform X(2)=∑x= n=0 CIfz=e z-transform is fourier transform X(e")=∑ enel n=-00 5 2021/1/51 zhongguo ulu_biomedIcal Engineering_shandong UniV5 2021/1/31 Zhongguo Liu_Biomedical Engineering_Shandong Univ. 3.1 z-Transform ( )   jw n jwn X e x n e  =− − =  ( )    [ ] n n X z x n x n z  =− − = =  Z ( )     = − = n 0 n X z x n z ◆one-sided, unilateral z-transform ◆z-Transform: two-sided, bilateral z-transform x n X z [ ]⎯→ ( ) Z ◆If , z-transform is Fourier transform. jw z = e