Patent TW-201110110-A (TW)
Title: Detecting and filtering method of random noise signal
Inventor: KO BYOUNG-GWAN
IPC: G11B20/24
Filed: 2010-05-12
Abstract: The present invention relates to a random noise signal detecting and filtering method; more specifically, it relates to a random noise signal detecting and filtering method wherein, in the event that the analyzed results of analyzed signals that were measured through the use of a general analog signal-outputting sensor fall outside of a predetermined critical value, they are interpreted as random signals and are filtered, thereby rendering possible precise monitoring and condition analysis. The random noise signal detecting and filtering method according to the present invention is characterized by comprising the following steps: a step in which the difference value (speed) of data currently being input from a sensor is calculated in comparison with previous data stored in a register; a step in which the above calculated results are compared with a critical value; a step in which a comparison is made as to whether the compared results are greater than the maximum critical value or less than the minimum critical value; and a step in which, if the compared results are greater than the maximum critical value or less than the minimum critical value, the [results] are regulated as a random signal, and the previous data are substituted with the current data. Moreover, the random noise signal detecting and filtering method according to the present invention is characterized by comprising the following steps: a step in which the difference value (speed) of data currently being input from a sensor is calculated in comparison with previous data stored in a register; a step in which the above calculated results are compared with a critical value; a step in which a comparison is made as to whether the compared results are greater than the maximum critical value or less than the minimum critical value; a step in which, if the compared results are greater than the maximum critical value or less than the minimum critical value, the above signal is prescribed, the above steps are repeated, the mean value is calculated from the acquired data, and this is stored in the register; and a step in which the mean value stored in the register is entered as the data (N) value of {formula 1} below, data (1) is discarded while the average of the N unit data is again calculated, this replaces the mean value previously stored in specific memory or buffer, and is used to calculate the speed the next time. With the random noise signal detecting and filtering method according to the present invention, precise monitoring and condition analysis of the target system is made possible through detailed signal measurement, and defects/errors may be reduced to enhance product productivity and quality. Furthermore, the calculation time used in filtering may be reduced through simplification of the method; as a result, the method may be applied in locations that require real-time control, such as with FPD or equipment for examining semiconductors. In addition, when applying such method in real-time control, the malfunctions and errors of equipment due to random noise signals may be prevented, and product productivity may be enhanced.