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Data structure of seven features.
| Features | MV | FFT | Db1 | Db2 | Db3 | Db4 | Db5 |
|---|---|---|---|---|---|---|---|
| Feature structure | 15 × 80 | 30 × 80 | 30 × 80 | 60 × 80 | 90 × 80 | 120 × 80 | 150 × 80 |
Note: MV, maximum value; FFT, the DC component and first order harmonic component of the coefficients of fast Fourier transformation; Db1, Db2, Db3, Db4, Db5, the approximation coefficients of discrete wavelet transformation based on wavelets Db1, Db2, Db3, Db4, and Db5, respectively.
