Basic sequences 4-20134568n 2 A sum of scaled delayed impulses =a3Dn+]+aoz-1]+a6-2]+a ◆ arbitrary sequence xm=∑xk[m-k k 10 1/30/2021 Zhongguo Liu_Biomedical Engineering_ Shandong Univ10 1/30/2021 Zhongguo Liu_Biomedical Engineering_Shandong Univ. Basic sequences [ ] [ ] [ ] k x n x k  n k      uarbitrary sequence    3  1  2  7 p n  a 3 n   a1 n   a2 n   a7 n  A sum of scaled, delayed impulses