1. A method for controlling the quality of an industrial processes, of the type comprising the steps of: making available one or more reference signals relating to the industrial process acquiring one or more real signals, indicative of the quality of said industrial process, comparing said one or more reference signal to said one or more real signals to identified defects in said industrial process, wherein it further comprises the operations of: obtaining a transformed signal from said reference signal; obtaining a transformed signal from said real signal; calculating energies of said transformed signals, respectively reference and real signals: said comparison operation comprising: comparing said energies of said transformed signals, respectively reference and real signals to each other to extract corresponding time frequency distributions for selected frequency values; calculating energies of said time frequency distributions; comparing the energies of said time frequency distributions with threshold values to identify energy values associated to defects; providing said energy values associated to the defects to a classifier.