5.1 Introduce O Discrete-time system representation a discrete-time system can be described by the input-output relation, impulse response and system function N y(n)=2bx(n-1)-2a, y(n-i) h(n) H(2)=Y(z) ∑b X(二) +)a.z5.1 Introduce ⚫ Discrete-time system representation 0 1 ( ) ( ) ( ) M N i i i i y n b x n i a y n i = = = − − −   0 1 ( ) ( ) ( ) 1 M i i i N i i i b z Y z H z X z a z − = − = = = +   h n( ) A discrete-time system can be described by the input-output relation, impulse response and system function