https://fr.mathworks.com/help/dsp/ref/dsp.spectrumestimator-system-object.html
dsp.SpectrumEstimator - Estimate power spectrum or power density spectrum - MATLAB
The dsp.SpectrumEstimator System object computes the power spectrum or the power density spectrum of a signal using the Welch algorithm or the filter bank...
dspestimatepowerspectrumdensity