Study of Tracking Differentiator on Filtering

In this paper, some results of tracking differentiator(TD) on filtering are presented. By virtue of the filtered signals and their differentiated signals, the phase delays produced after being filtered are compensated by predicting. Some simulation examples prove that the initial signals can be better recovered by the method of TD and predicting. In a practical example, a good result is obtained by the adoption of step-varying TD and predicting under the condition of sampled signal with noise and sampled time varying.