Abstract: The method of the invention comprises the steps of: receiving waveform data (100); generating one main signal Y0; saving main data related to main signal Y0; defining an input signal to fold, Yin, that is said main signal Y0 or a folded signal that has been generated just before; generating a new folded signal, Yf, that is a global reproduction of lower resolution of input signal to fold, Yin, and that has less samples than the latter by performing the steps of: applying to whole input signal to fold, Yin, a folding algorithm such that: its samples satisfying folding rules are selected; its samples not satisfying said folding rules are deleted; thereafter grouping the selected samples for forming said new folded signal Yf; saving sub data related to said folded signal Yf.