Envelope approximation using 2nd order polynomial coefficients: |
49 |
a0 |
constant term of the polynomial |
50 |
a1 |
linear term of the polynomial |
51 |
a2 |
quadratic term of the polynomial |
Energy distributed across time (4 quarters): |
52 |
en_1/4 |
1st quarter energy |
53 |
en_2/4 |
2nd quarter energy |
54 |
en_3/4 |
3rd quarter energy |
55 |
en_4/4 |
4th quarter energy |
Statistics: |
56 |
mean |
mean value |
57 |
std |
standard deviation |
Statistics distributed across time (4 quarters): |
58 |
mean_1/4 |
1st part mean |
59 |
mean_2/4 |
2nd part mean |
60 |
mean_3/4 |
3rd part mean |
61 |
mean_4/4 |
4th part mean |
62 |
std_1/4 |
1st part standard deviation |
63 |
std_2/4 |
2nd part standard deviation |
64 |
std_3/4 |
3rd part standard deviation |
65 |
std_4/4 |
4th part standard deviation |
Structural: |
66 |
frq_zero |
number of zeros per second |
67 |
skewness |
relative position of the maximum absolute value of the signal around the middle point of the interval. |