Method for monitoring the quality of industrial processes and system therefrom

A method for monitoring the quality of an industrial working process, which includes identifying defects of the working process, of the type comprising the steps of:

• acquiring a signal having multiple frequency components from the industrial working process,
• evaluating said signal having multiple frequency components acquired from the industrial working process to indicate if said defects and a defect analysis step is performed on said signal having multiple frequency components, said evaluation being performed without comparing said signal having multiple frequency components acquired from the industrial working process to a stored reference signal,
• wherein it further comprises the operations of:
• decomposing said at least one signal having multiple frequency components in signals having single frequency components,
• calculating the information content for each signal having a single frequency component,
• analyzing the information content for each signal having a single frequency component, and
• if the value of the information content of the signal at the lowest single frequency component does not represent a main percentage of the information content of the whole acquired signal, said acquired signal having multiple frequency components is evaluated as indicative of a working process including defects and a defect analysis step is performed on said signal having multiple frequency components.