85.1 Digital Processing of Continuous-Time Signals To prevent aliasing, an analog anti aliasing filter is employed before the S/h circuit To smooth the output signal of the D/A converter, which has a staircase-like waveform, an analog reconstruction filter is used§5.1 Digital Processing of Continuous-Time Signals • To prevent aliasing, an analog anti￾aliasing filter is employed before the S/H circuit • To smooth the output signal of the D/A converter, which has a staircase-like waveform, an analog reconstruction filter is used