PCG Classification Using Multidomain Features and SVM Classifier

Table 10

Summary of the correlation coefficients.

No.	Feature domain	Max. absolute; CC	Physical meaning
1	Time interval	0.286	sd_IntSys
2	State amplitude	-0.159	sd_Amp_S2Sys
3	Energy	0.345	Standard deviation of
4	High-order statistics	0.185	sd_S1_kurtosis
5	Cepstrum	0.216	The seventh cepstrum coefficient of S2 state
6	Frequency spectrum of state	0.417	Spectrum value of 30 Hz of S2 state
7	cyclostationarity	-0.240	Sharpness of the peak of cycle frequency spectral density
8	Entropy	-0.374	Average value of sample entropy of diastolic state
9	Frequency spectrum of records	-0.272	Ratio of spectrum magnitude sum in Hz