Method and device for digitizing an analogical signal

A device for digitizing an analogical signal comprising a data signal in a frequency channel, comprising:

• means (12) for receiving said analogical signal,
• means (18) for amplifying said received analogical signal to obtain an amplified signal having a power (Pwhole),
• means (20) for filtering said amplified signal to cut out frequencies outside the frequency channel of the data signal and to obtain a filtered analogical signal,
• means (24) for converting said filtered analogical signal into a digital signal having a power (Ppartial),
• means for measuring (32) the power (Pwhole) of the amplified signal after amplification and before filtering,
• means (26) for determining an amplification control signal (C18) for the amplification of the received analogical signal as a function of the power (Pwhole) of the amplified signal, and
• means (22) for amplifying the filtered analogical signal before conversion,
• means (30A) for computing a feature of the received analogical signal representative of an amplitude distribution type of the received analogical signal,
• means (30B) for computing a reference optimal power (P0) of the power (Ppartial) of the digital signal as a function of the feature representative of the computed amplitude distribution of the received analogical signal, and
• means (26) for determining an amplification control signal (C22) for the amplification of the filtered analogical signal as a function of the reference optimal power (P0) of the power (Ppartial) of the digital signal.

A device for digitizing an analogical signal comprising a data signal in a frequency channel, comprising:

• a receiving unit to receive said analogical signal;
• a first amplifier to amplify said received analogical signal to an amplified signal having a power (Pwhole);
• a filter to filter said amplified signal to cut out frequencies outside the frequency channel of the data signal to obtain a filtered analogical signal;
• a converter to convert said filtered analogical signal into a digital signal having power (Ppartial);
• a measuring unit to measure the power (Pwhole) of the amplified signal after amplification and before filtering;
• a determining unit to determine an amplification control signal (C18) to control the amplification of the received analogical signal as a function of the power (Pwhole) of the amplified signal;
• a second amplifier to amplify the filtered analogical signal before the conversion of said filtered analogical signal;
• and
• a computing unit to compute an amplitude distribution type of the received analogical signal and to compute a reference optimal power (P0) of the power (Ppartial) of the digital signal as a function of the computed amplitude distribution type of the received analogical signal,
• wherein said determining unit determines an amplification control signal (C22) for the amplification of the filtered analogical signal as a function of the reference optimal power (P0) of the power (Ppartial) of the digital signal.