Bessel filters with varying parameters

The paper presents the methodology how to vary in time values ω_0i = ω_0i(t) selected links of a structure of low-pass Bessel filters. In examinations of the filters a significant shortening of the transient state is achieved at the cost of slight increase in the oscillations. It allows shortening time intervals of filtered signals. Typical filtration results are presented which simulations of selected structures of filters with varying parameters obtain.