Fig. 7From: An automatic segmentation method for heart soundsMurmur elimination effect for heart sound containing S4 and systolic murmurs using the three methods. a Is the non-murmur-reduced heart sound, and b–d show the sounds filtered by ALPF, WT and 200-LPF, respectively. In the calculation of \(SMR, U = U1 + U2 + \cdot\cdot\cdot + U6\), and \(V = V1 + V2 + V3\)Back to article page