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Detection of the third and fourth heart sounds using Hilbert-Huang transform

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Academic year: 2020

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Figure

Figure 1 Diagram of the recognition method.
Figure 2 The envelope (b) and Shannon Energy (c) of a heart sound record (a). The threshold wasshown with a dashed line in (c).
Figure 3 A normal heart sound record (a). The magnitude (b) of the maximal instantaneous frequency(c) was indicated as well.
Figure 5 Frequency-Magnitude plot of the diastolic interval - (a) Normal heart sound. (b)Abnormalheart sound with S3 and S4 after cluster analysis.
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