A device for processing a signal includes a processor stage configured to filter the signal present in a frequency-domain representation by a filter with a filter characteristic in order to obtain a filtered signal, to provide the filtered or a signal derived from the filtered signal with a frequency-domain window function, in order to obtain a windowed signal, wherein providing has multiplications of frequency-domain window coefficients of the frequency-domain window function by spectral values of the filtered signal or the signal derived from the filtered signal in order to obtain multiplication results, and summing up the multiplication results. Further, the device has a converter for converting the windowed signal or a signal determined using the windowed signal to a time domain in order to obtain the processed signal.