⊥ NEAR SYST∈As 0ua0AT井 WILL TYPICALLY& E COLLECT∈0 FRoM只 EAL SY5TEMS 015CQET∈0ATA DISCRETE AODELS ·C0S(0ERT1SSC∈AARD: G yt T RESPONSE GIVEN8￥ K INTEGER Y(K CONVOLUTON INTEGRAL )(t-y) TYPICALLy AsSUME THAT (T)=o y ro g(r)DEfINES THE CAUSAL RELATIONSHIf 6ET心ETHe工NPUT0(+)400rPT9) CALLED THE IMPULSE RESPONSE COULD MODEL THE SYSTEM VERY WELL 工 F WE COULD FIND9比t)