DEVICE AND METHOD FOR DETERMINING AN ENVELOPE OF A SIGNAL

A device (11) for determining an envelope of a signal (S9). The device includes a conditioning means (12), a first spectral analysis means (13), a filtering means (14), a second spectral analysis means (15), and determining means (16). The conditioning means (12) generates a vector of samples from samples of the signal (S9) at a first predetermined sampling rate. The first spectral analysis means (13) performs a spectral analysis of the vector of samples to obtain a set of frequency bins. The filtering means (14) filters the frequency bins to select a frequency bin having its frequency equal to at least one positive predetermined frequency. The second spectral analysis means (15) performs an inverse spectral analysis of the selected frequency bin to obtain an intermediary signal (S15). The determining means (16) determines the magnitude of the intermediary signal (S15).