Table 2.
The extracted features in this work.
| Feature Name | Used Signals | # of Features |
|---|---|---|
| 1—4–6 Hz signal power | X, Y, Z—wrist and ankle | 6 |
| 2—0.5–15 Hz signal power | X, Y, Z—wrist and ankle | 6 |
| 3—Percentage power of frequencies >4 Hz | X, Y, Z—wrist and ankle | 6 |
| 4—Number of autocorrelation peaks | X, Y, Z—wrist and ankle | 6 |
| 5—Sum of autocorrelation peaks | X, Y, Z—wrist and ankle | 6 |
| 6—Amplitude of the first autocorrelation peak | X, Y, Z—wrist and ankle | 6 |
| 7—Lag of the first autocorrelation peak | X, Y, Z—wrist and ankle | 6 |
| 8—Spectral entropy | X, Y, Z—wrist and ankle | 6 |
| 9—First dominant frequency | X, Y, Z—wrist and ankle | 6 |
| 10—Power of first dominant frequency | X, Y, Z—wrist and ankle | 6 |
| 11—Second dominant frequency | X, Y, Z—wrist and ankle | 6 |
| 12—Power of second dominant frequency | X, Y, Z—wrist and ankle | 6 |
| 13—Cross-correlation | X and Y—wrist and ankle | 2 |
| 14—Cross-correlation | X and Z—wrist and ankle | 2 |
| 15—Cross-correlation | Y and Z—wrist and ankle | 2 |
| Total Number of Features | 78 | |