The invention relates to a method for the filtering and analog/digital conversion of an incoming analog signal including an analog filtering of the incoming analog signal so as to filter the frequency components located outside a desired frequency band, and a conversion of the filtered analog signal to a digital signal. The digital signal is reformatted in a form that is substantially similar, at least in the desired frequency band, to the form of the incoming analog signal. A final digital filtering of the reformatted digital signal is performed so as to filter the frequency components located outside the desired frequency band.