Patent ID: 8350742

Claim:
Method for forming a global spectrum of an analogue signal to be digitized, in which: the analogue signal is sampled with a first analogue-digital converter of determined Shannon frequency, so as to obtain an aliasing spectrum, the analogue signal not having been previously filtered by an anti-aliasing filter; a base spectrum is subtracted from the aliasing spectrum so as to obtain an aliased spectrum, the base spectrum corresponding to an aliasing-free spectrum of the said analogue signal; a dealiased spectrum is computed on the basis of the aliased spectrum as a function of the Shannon frequency of the converter; the base spectrum is concatenated with the dealiased spectrum so as to form the global spectrum of the analogue signal; method in which: for a plurality of reference analogue signals of the same type as the analogue signal to be digitized: an anti-aliasing filter is applied to the said reference analogue signals at the Shannon frequency; the said reference analogue signals are sampled with a second analogue-digital converter of the same Shannon frequency as the first analogue-digital converter so as to obtain the reference spectra of the reference analogue signals; a mean of the reference spectra is computed so as to form the base spectrum.