5.1 Digital Processing of Continuous-Time Signals Complete block-diagram Anti- aliasing S/H A/D DSP D/A Reconstruction filter filter Since both the anti-aliasing filter and the reconstruction filter are analog lowpass filters, we review first the theory behind the design of such filters Also,the most widely used IIR digital filter design method is based on the conversion of an analog lowpass prototype§5.1 Digital Processing of Continuous-Time Signals • Since both the anti-aliasing filter and the reconstruction filter are analog lowpass filters, we review first the theory behind the design of such filters • Also, the most widely used IIR digital filter design method is based on the conversion of an analog lowpass prototype Anti- aliasing filter S/H A/D D/A Reconstruction DSP filter Complete block-diagram