Relationship between the heart sounds and the ECG wave form.
(a) Second sound S2 of the normal phonocardiogram. (b) The Fourier transform of the normal second sound S2.
The short-time Fourier transform application of the normal second cardiac sound S2.
The Wigner distribution of the normal second cardiac sound S2.
The wavelet transform of the normal second cardiac sound S2.
Continuous wavelet transform analysis for the second cardiac sound of (a) the pulmonary stenosis, (b) the atrial septal defect (ASD), (c) the normal PCG (N), and (d) the mitral stenosis (MS).
Contour plots by using the continuous wavelet transform of the normal phonocardiogram case (a) and abnormal cases [(b), (c), (d)].
Time-frequency characteristics for the internal components of the sound S2.
Measure of the split and normalized split of the PCG signals considered.
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