Sample rate converting filter

Sample rate converter for filtering a discrete-time input signal having a sample rate q.multidot.f.sub.s by means of a system filter and also for converting the discrete-time input signal having a sample rate q.multidot.f.sub.s to a discrete-time output signal having a sample rate p.multidot.f.sub.s, p and q being unequal positive integers greater than or equal to one, the sample rate converter having an input an output, said sample rate converter comprising a cascade combination of a partial filter and an equalizer for equalizing the frequency characteristic of the sample rate converter, said partial filter and equalizer having respective inputs and outputs said cascade combination having an input coupled to the input of the sample converter and having an output coupled to the output of the sample rate converter, said equalizer comprising a combining means and a feedforward path having an input and an output, said combining means having a first input, a second input and an output, said first input being coupled to the input of the equalizer and said output of the combining means being coupled to the input of the feedforward path, the output of the feedforward path being coupled to the output of the equalizer and, by way of an equalization filter, to said second input.