TABLE 1.
The 62 feature extraction methods used in this work. This table is based on the work of Phinyomark et al. (2017), Hu et al. (2018b), and Atzori et al. (2014).
| Name | Abbreviation | Notes | Size |
|---|---|---|---|
| Amplitude of the first burst | AFB | wf = 32 ms | 1 |
| Approximate entropy | ApEn | — | 1 |
| Autoregressive coefficients | ARC | order = 4 | 5 |
| Cepstrum coefficients | CC | order = 4 | 5 |
| Critical exponent analysis | CEA | — | 1 |
| Differenced version of ARC | DARC | order = 4 | 5 |
| Differenced version of CC | DCC | order = 4 | 5 |
| Detrended fluctuation analysis | DFA | — | 1 |
| Differenced version of LOG | DLD | — | 1 |
| Differenced version of MAV | DMAV | — | 1 |
| Max-to-min drop in PSD ratio | DPR | — | 1 |
| Differenced version of STD | DStd | — | 1 |
| Differenced version of TM | DTM | order = 3 | 1 |
| Differenced version of V | DV | order = 3 | 1 |
| Differenced version of VAR | DVAR | — | 1 |
| End value | EndVal | — | 1 |
| Frequency ratio | FR | f lb = [20−45], f hb = [95−f max ] | 1 |
| Higuchi fractal dimension | HG | kmax = 128 | 1 |
| Histogram | HIST | bins = 3, 10 | 3, 10 |
| Integrated EMG | IEMG | — | 1 |
| Katz fractal dimension | KATZ | — | 1 |
| Kurtosis | KURT | — | 1 |
| Log detector | LD | — | 1 |
| Second-order moment | M2 | — | 1 |
| Mean absolute value | MAV | — | 1 |
| MAV type 1 | MAV1 | — | 1 |
| MAV type 2 | MAV2 | — | 1 |
| Maximal value | MAX | — | 1 |
| Marginal discrete wavelet transform | mDWT | wavelet = db7, level = 3 | 3 |
| Mean | MEAN | — | 1 |
| Minimal value | MIN | — | 1 |
| Mean frequency | MNF | — | 1 |
| Mean power | MP | — | 1 |
| Myopulse percentage rate | MYOP | Threshold 2e1/2e-2/5e-5 | 1, 1, 1 |
| Power spectrum deformation | OHM | — | 1 |
| Peak frequency | PKF | — | 1 |
| Power spectrum fractal dimension | PSDFD | using katz | 1 |
| Power spectrum ratio | PSR | — | 1 |
| Root mean square | RMS | — | 1 |
| Sample entropy | SampEn | — | 1 |
| Skewness | SKEW | — | 1 |
| Spectral moment | SM | order = 2 | 1 |
| Signal-to-motion ratio | SMR | frequency: <10 Hz | 1 |
| Signal-to-noise ratio | SNR | — | 1 |
| Number of slope sign changes | SSC | — | 1 |
| Simple square integral | SSI | — | 1 |
| Start value | StartVal | — | 1 |
| Standard deviation | STD | — | 1 |
| Time-dependent power spectrum descriptors | TDPSD1-6 | 1,1,1,1,1,1 | |
| Absolute temporal moment | TM | order = 3 | 1 |
| Total power | TP | — | 1 |
| v-order | V | order = 3 | 1 |
| Variance | VAR | — | 1 |
| Variance of central frequency | VCF | — | 1 |
| Willison amplitude | WAMP | Threshold 2e1/2e-2/5e-5 | 1, 1, 1 |
| Waveform length | WL | — | 1 |
| Number of zero crossings | ZC | — | 1 |