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| Feature name | Feature declaration |
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| Loudness | The overall volume or sound intensity of a sound signal |
| Alpha ratio | The energy ratio of the sound signal spectrum’s low and high-frequency parts |
| Hammarberg index | The change pattern of the fundamental frequency in the sound signal |
| Slope 0–500 | The frequency spectrum’s rate of alteration is assessed in the range from 0 Hz to 500 Hz |
| Slope 500–1500 | The frequency spectrum’s rate of alteration is assessed in the range from 500 Hz to 1500 Hz |
| Spectral flux | The amount of flow or variation in the spectrum of a sound signal |
| mfcc1 | The first Mel-Frequency Cepstral Coefficients |
| mfcc2 | The second Mel-Frequency Cepstral Coefficients |
| mfcc3 | The third Mel-Frequency Cepstral Coefficients |
| mfcc4 | The fourth Mel-Frequency Cepstral Coefficients |
| F0semitoneFrom27.5 Hz | The semitone difference between the fundamental frequency of the sound signal and 27.5 Hz |
| Jitter local | The local jitter of the sound signal |
| Shimmer local dB | The local trill of a sound signal |
| HNRdBACF | Harmonic to noise ratio (HNR) of a sound signal |
| LogRelF0-H1-H2 | The logarithmic difference between the fundamental frequency in the sound signal and the corresponding first (H1) and second (H2) harmonics |
| logRelF0-H1-A3 | The logarithmic difference between the fundamental frequency in the sound signal and the corresponding first harmonic (H1) and third formant (A3) |
| F1frequency | The frequency of the first formant (F1) in the sound signal |
| F1bandwidth | The bandwidth of the first formant (F1) in the sound signal |
| F1amplitudeLogRelF0 | The logarithmic difference between the amplitude of the first formant (F1) in the sound signal and the fundamental frequency |
| F2frequency | The frequency of the second formant (F2) in the sound signal |
| F2amplitudeLogRelF0 | The logarithmic difference between the amplitude of the second formant (F2) in the sound signal and the fundamental frequency |
| F3frequency | The frequency of the third formant (F3) in the sound signal |
| F3amplitudeLogRelF0 | The logarithmic difference between the amplitude of the third formant (F3) in the sound signal and the fundamental frequency |
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