An input/output terminal receives a multi-channel analog signal within a predetermined frequency band, and transmits a single-channel analog signal within this frequency band. A tuning module has a reception channel based upon a two-stage down conversion to baseband, and is connected between the input/output terminal and an analog-to-digital conversion stage. A transmission channel based upon a two-stage up conversion is connected between a digital-to-analog conversion stage and the input/output terminal. The two channels include a common filter of the bulk acoustic wave type or of the surface acoustic wave type between the two frequency transposition stages of the two channels. A digital reception unit is connected to the output of the analog-to-digital conversion stage, and a digital transmission unit is connected to the input of the digital-to-analog conversion stage.