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A optimal dual-rate digital redesig method is proposed that ca be applied to continuous-time and fast-rate discrete-time control systems. The paper presents a technique, hich relies o the solutio of a dual-rate H2 discrete-time control problem, to convert such systems to either a slo -rate or a dual-rate sampled-data control system hile guaranteeing closed-loop stability and performance i the discrete-time H2 sense. The proposed technique results i sampled-data control systems providing satisfactory closed-loop performances over an extended range of sampling rates, as compared ith other idely used methods of digital redesign. Furthermore, the proposed digital redesig technique is useful i practice since it allo s the designer to constrai the complexity of the digital controllers, thus resulting in lo -order digital controllers easily implementable i soft are code and free of causality and real-time problems. Numerical examples provide a compariso of the proposed digital redesig technique ith ell-kno approaches.