Table 2.
Feature | Equation | Feature | Equation |
---|---|---|---|
Mean | Rectified mean | ||
Peak to peak value | Root mean square | ||
Standard deviation | Skewness | ||
Kurtosis | Impulse factor | ||
Shape factor | Crest factor | ||
Coefficient of variation | Mean frequency | ||
Frequency center | Root mean square frequency | ||
Standard deviation frequency |
Note: is the ith value of signal , is the number of data points. is a spectrum for , is the number of spectrum lines; is the frequency value of the kth spectrum line.