Figure 7
From: A framework for automatic heart sound analysis without segmentation
Comparison of DWT denoising on heart sounds with different murmur intensity. (a) Heart sound with relatively mild aortic stenosis. (b) Reconstructed signal from d5 DWT coefficients. The murmur had been attenuated significantly. (c) Heart sound with severe aortic stenosis. (d) Reconstructed signal from d5 DWT coefficients. Murmur is still largely present.