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Time-frequency analysis of the second cardiac sound in phonocardiogram signals
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10.1118/1.2008427
/content/aapm/journal/medphys/32/9/10.1118/1.2008427
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/32/9/10.1118/1.2008427

Figures

Image of FIG. 1.
FIG. 1.

Relationship between the heart sounds and the ECG wave form.

Image of FIG. 2.
FIG. 2.

(a) Second sound S2 of the normal phonocardiogram. (b) The Fourier transform of the normal second sound S2.

Image of FIG. 3.
FIG. 3.

The short-time Fourier transform application of the normal second cardiac sound S2.

Image of FIG. 4.
FIG. 4.

The Wigner distribution of the normal second cardiac sound S2.

Image of FIG. 5.
FIG. 5.

The wavelet transform of the normal second cardiac sound S2.

Image of FIG. 6.
FIG. 6.

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).

Image of FIG. 7.
FIG. 7.

Contour plots by using the continuous wavelet transform of the normal phonocardiogram case (a) and abnormal cases [(b), (c), (d)].

Tables

Generic image for table
TABLE I.

Time-frequency characteristics for the internal components of the sound S2.

Generic image for table
TABLE II.

Measure of the split and normalized split of the PCG signals considered.

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/content/aapm/journal/medphys/32/9/10.1118/1.2008427
2005-08-26
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-frequency analysis of the second cardiac sound in phonocardiogram signals
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/32/9/10.1118/1.2008427
10.1118/1.2008427
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