1

Cough Length: length from the start of the cough until 99.4% of the cough energy is achieved (s)

2

Lratio: Cough flow length/cough sound length

3

Skewness: where μ, and σ are the mean, and the standard deviation of the cough sound signal respectively.

4

Kurtosis: where μ, and σ are the mean, and the standard deviation of the cough sound signal respectively.

5

Crest Factor: maximum sound pressure wave/Root Mean Square "RMS" sound


Frequency Series

6

Dominant Frequency: the frequency with the most power present in the cough sound pressure wave (Hz)

7

Total energy

824

Octave Analysis (117)**

25

Total Power: total power in the cough sound signal (W)

26

Peak Power: maximum power level (W)

27

Average Power: Average power over all frequency ranges (W)

28

Sound beta: the inverse power law 1/f^{β} of the power spectrum [22].

29

Sound Wavelet: a wavelet parameter based on the variability in the wavelet detail coefficients found in the wavelet decomposition of the cough sound

30

Ratio: mean spectrogram intensity/max spectrogram intensity

31

Peaks: this counts the number of peaks in the spectrogram that meet a given threshold

3251

Spec1  Spec20: The spectrogram is broken into 20 evenly spaced time intervals. For each interval, the maximum energy is found, and the corresponding frequency is saved.

5281

Spec21  Spec50: The spectrogram is broken into 30 evenly space time intervals. For each interval, the average frequency is calculated and saved.

82111

Spec51  Spec80: The spectrogram is broken into 30 evenly spaced frequency intervals. For each frequency interval the time at which half of the energy is attained is saved.
