Massnahmen zur Verbesserung des Verfahrens und Vorrichtung eines digitalen Frequenzumsetzungsfilters

A digital filter providing output samples at a rate B while input samples are being provided at a rate A. The filter impulse response h(t) is sampled at a rate P = a.A = b.B, with P being the lowest common multiple to A and B, to derive Np filter coefficients (Ci) therefrom. Said coefficients are arranged into "a" sets of Np/a coefficients and stored. Output samples are then computed by feeding input samples Sn at incoming rate while permutating the sets of coefficients and generating output samples at said output rate.