| 摘要 |
A method for controlling the quality of an industrial processes, of the type comprising the steps of: making available one or more reference signals (xref) relating to the industrial process acquiring one or more real signals (xreal), indicative of the quality of said industrial process, comparing said one or more reference signal (xref) to said one or more real signals (xreal) to identify defects in said industrial process. According to the invention the method further comprises the operations of: obtaining a transformed signal (Xref_inv_norm) from said reference signal (xref) ; obtaining a transformed signal (Xreal_inv_norm) from said real signal (Xreal) ; calculating energies (Eref, Ereal) of said transformed signals, respectively reference (Xref_inv_norm) and real (Xreal_inv_norm), said comparing operation comprising: comparing said energies (Eref, Ereal) of said transformed signals respectively reference (Xref_inv_norm) and real (Xreal_inv_norm) to extract corresponding time frequency distributions (Tfdref, Tfdreal) for selected frequency values (f_e); calculating energies (Etreal, Etref) of said time frequency distributions (Tfdref, Tfdreal); comparing the energies of said time frequency distributions (Tfdref, Tfdreal) with threshold values (max_Tfdref) to identify energy values associated to defects. <IMAGE>
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