ABSTRACT
From the control viewpoint, transition to digital technologies characterizes itself as a transition to discrete control with level and time sampling. Unlike continuous signals, the input and output signals of digital controls take discrete values during discrete time (Isermann, 1981). Time sampling represents the periodic process characterized by a sampling period T. Without taking into account these features of digital control, direct implementation of analog algorithms leads to the fall of static accuracy of the system, to appearance of oscillatory components with amplitude proportional to the sampling period and to electric dissonance.
