Nth-Order Difference Equations N Form ayn-k=∑对m一k1 changed k=0 k=0 to N M 川-∑an-6]=∑bn-k alo] k=1 k=0 normalized M to unity yinI=∑4m-+ kn k=1 k=0 ∑b-6 H()=-k ∑a=k k=111 Nth-Order Difference Equations 1 0 [ ] [ ] [ ] N M k k k k y n a y n k b x n k = = − − = −     = − = − − = N k k k M k k k a z b z H z 1 1 1 ( ) 0 0 [ ] [ ] = =   − = − N M k k k k a y n k b x n k 1 0 [ ] [ ] [ ] N M k k k k y n a y n k b x n k = = = − + −   Form changed to a[0] normalized to unity