Figure 3. Spectrum difference distribution of normal and abnormal signals in five auscultation areas

From

Spectrum Characteristics Analysis and Recognition of CHD Heart Sound in Five Auscultation Locations

Sheng MIAO, Jian’e Dong, Jingyu Hou, Zhong Lihui

Journal of Biomedical Engineering and Technology. 2020, 8(1), 14-24 doi:10.12691/jbet-8-1-3