Anomaly monitoring device and method

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.

2. 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;

a threshold setting unit for setting a threshold value for each of the comparing portions by multiplying by a multiplier the difference between a maximum power and a minimum power among powers of corresponding same comparing portions in the segmented target signals; 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 less than a power of the same comparing portion of an immediately previous segmented target signal and if the difference between the powers exceeds the threshold value, 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.

3. An anomaly monitoring method comprising:

receiving a periodic target signal generated by an operating apparatus;

extracting amounts of characteristics including a plurality of parameters from the target signal;

judging whether the apparatus is operating normally or not by using the amount of characteristics;

storing a plurality of segmented target signals provided from the target signal in a form of a queue;

providing a number of comparing portions in a time-axis of each segmented target signal;

obtaining a power of each of the comparing portions in each segmented target signal;

judging 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

determining that the signal input unit is abnormal if the number of abnormal comparing portions in the latest segmented target signal exceeds a threshold number.

4. An anomaly monitoring method comprising:

receiving a periodic target signal generated by an operating apparatus;

extracting amounts of characteristics including a plurality of parameters from the target signal;

judging whether the apparatus is operating normally or not by using the amount of characteristics;

storing a plurality of segmented target signals provided from the target signal in a form of a queue;

providing a number of comparing portions in a time-axis of each segmented target signal;

obtaining a power of each of the comparing portions in each segmented target signal;

setting a threshold value for each of the comparing portions by multiplying by a multiplier the difference between a maximum power and a minimum power among powers of corresponding same comparing portions in the segmented target signals;

judging that a comparing portion of a latest segmented target signal is abnormal if a power of the comparing portion is less than a power of the same comparing portion of an immediately previous segmented target signal and if the difference between the powers exceeds the threshold value; and

determining that the signal input unit is abnormal if the number of abnormal comparing portions in the latest segmented target signal exceeds a threshold number.