Method for selective filtering

According to the present invention, a) a sampling frequency provided by FA determined in advance or arrive with a prototype of a characteristic frequency FC select filter coefficients H1 (n). B) in these TK= δ t+k*d, k=0,1, ..., H1 from the coefficient (n) with the characteristic frequency calculation in FC2 H2 a selection filter coefficient (t), d= (FC2*FA)/f (CZ*FA1), which is through TK interpolating these points of continuous time impulse response h (t) value. C) selecting the filter in case of FA1 to coefficients of the new H2 (t).