Patent ID: 7555407
Filing Date: 2009-06-30
Classification: G01H

Abstract:
1. An anomaly monitoring device comprising: a signal input unit for receiving a periodic target signal generated by an operating apparatus; a characteristics extracting unit for extracting amounts of characteristics including a plurality of parameters from the target signal; a judging unit for judging whether the apparatus is operating normally or not by using the amount of characteristics extracted from the characteristics extracting unit; a storage unit for storing therein a plurality of segmented target signals provided from the target signal in a form of a queue; a dividing unit for providing a number of comparing portions in a time-axis of each segmented target signal stored in the storage unit; a power calculating unit for calculating a power of each of the comparing portions in each segmented target signal; and an anomalous input detecting unit which judges that a comparing portion of a latest segmented target signal is abnormal if a power of the comparing portion is in a range of abnormal values when compared with a corresponding comparing portion in a previous segmented target signal stored in the storage unit, and determines that the signal input unit is abnormal if the number of abnormal comparing portions in the latest segmented target signal exceeds a threshold number.