Patent ID: 6438567
Filing Date: 2002-08-20
Classification: H04L

Abstract:
A method for selective filtering, which comprises:simulating different selective filters with a coefficient and filter calculation unit, a phase detector, a loop filter, and a digital oscillator depending on sets of first and second coefficients used for filter calculation; determining a first set of coefficients of a prototype of a further selective filter at a characteristic frequency fc for a given sampling frequency fa; calculating a second set of coefficients of the further selective filter at a characteristic frequency fc2 from the first coefficients at points tk=&Dgr;t+k*d, where k=0, 1, . . . , the further selective filter to be operated at a sampling rate fa1, by interpolating values of a continuous-time impulse response of a simulation of the further selective filter at points tk, where d=fc2*fafc*fa1;emulating the further selective filter with the second coefficients using the coefficient and filter calculation unit, the phase detector, the loop filter, and the digital oscillator; andoperating the further selective filter at the sampling rate fa1.