Fractional frequency and sampling-rate change in the frequency domain

摘要

An arrangement (30) and a method for digitally filtering a time-discrete digital signal, wherein the signal is transformed to the frequency domain using discrete Fourier transformation (31), the signal is filtered in the frequency domain (33), wherein a filter response can be adapted in real time as required to respond to changes in the interference environment, and the filtered signal is transformed back to the time domain using inverse discrete Fourier transformation (32) to create an output signal, and wherein bin frequencies of said signal in the frequency domain are translated by a real amount and the sampling rate of the output signal is changed by a real factor.

主权项

1. A method for digitally filtering a time-discrete signal, comprising:
transforming said signal to the frequency domain using discrete Fourier transformation having a predetermined resolution; filtering said signal in the frequency domain; and transforming said filtered signal back to the time domain using inverse discrete Fourier transformation to create an output signal; wherein bin frequencies of said signal in the frequency domain are translated by a real amount, wherein said translating of bin frequencies is performed in two parts before and after said filtering of the signal in the frequency domain; and wherein a sampling rate of said output signal is changed by a real factor.