Heart sound

0 db

SNR of the denoising heart sound/dB

Improved algorithm

CEEMDAN+

wavelet

EEMD+

wavelet

VMD

Wavelet

NHS

14.70

13.35

13.23

13.08

11.11

ASD

9.88

8.78

8.30

9.45

8.51

AI

12.26

10.85

10.68

11.51

10.18

AS

10.74

7.15

7.11

8.76

7.35

S4

15.22

13.09

12.25

13.90

11.95