Patent ID: 8571823

Claim:
A system for controlling quality of a manufacturing process for recognizing defects in result of a production, comprising: sensor which detects one or more process parameters; and an electronic control and processing unit configured to process the signals issued by said sensor and configured to control the quality of the manufacturing process, wherein said electronic control and processing unit is configured to acquire, by detecting one or more quantity of the production of said manufacturing process, one or more real signals produced by a machine involved in the manufacturing process, where the one or more real signals are indicative of the quality of said manufacturing process; wherein said electronic control and processing unit comprises storing means for storing one or more reference signals corresponding to said one or more real signals and indicative of a good-quality process for the manufacturing process and is configured to provide from the storing means said one or more reference signals corresponding to said one or more real signals and indicative of a good-quality process for the manufacturing process; wherein said electronic control and processing unit is further configured by a computer-executable software code loaded in a memory of said electronic control and processing unit to obtain a reference transformed signal from said reference signal storied in the storing means and to acquire a transformed real signal from said real signal, and is configured to convert each of the transformed real signal and the transformed reference signal into a respective vector of energies, where the vector of energies comprises an integer number k of frequency values; and wherein said electronic control and processing unit is further configured by a computer-executable software code loaded in the memory of said electronic control and processing unit to compare said one or more reference signals with said one or more real signals to identify the defects in the result of the production, wherein said electronic and control processing unit is configured to compare by: comparing said vector of energies of said transformed reference signal with said vector of energies of said transformed real signal and selecting frequency values among said k frequency values on the basis of said comparison, respectively, for extracting corresponding time-frequency distributions for said selected frequency values; calculating energies of said time-frequency distributions; and comparing the energies of said time-frequency distributions with threshold values in order identify energy values associated with said defects, and the corresponding time coordinates of said defects.