Abstract
This paper deals with an observation method of derivative signal using a hybrid filter. The derivative signal is produced by integrating the product of an input and a sawtooth wave over a finite time interval T. The sawtooth wave has period T. Three such derivative signals are provided for sampling of period T/3. Their initial points of integration are at intervals of T/3.
The approximate frequency characteristic of this hybrid filter is derived. In order to check the properties of this filter in the time domain, a digital simulation was carried out. And some examples of this simulation are presented.
