Method for selective filtering

摘要

A method for digital clock recovery and selective filtering includes prescribing or calculating first coefficients of a prototype of a selective filter at a characteristic frequency fc for a given sampling frequency fa. Second coefficients of a selective filter are calculated at the characteristic frequency fc2 from the first coefficients at points tk=DELTAt+k*d, where k is an integer greater than or equal to 0, by interpolating values of a continuous-time impulse response at points tk, where 1 $d=\frac{\mathrm{fc2}*\mathrm{fa}}{\mathrm{fc}*{\mathrm{fa}}_1}.$ The selective filter is operated with the second coefficients at fa1.