Table 4.

Summary of cepstrum-domain features.

Feature index	Feature name	Physical meaning
1-13	Cepstrum coefficients	Cepstrum coefficients of a PCG recording
14-26	Cepstrum coefficients	Cepstrum coefficients of jointed S1 state
27-39	Cepstrum coefficients	Cepstrum coefficients of jointed systolic state
40-52	Cepstrum coefficients	Cepstrum coefficients of jointed S2 state
53-65	Cepstrum coefficients	Cepstrum coefficients of jointed diastole state