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Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
ISSN: 1058-6393
ISBN: 0-8186-6405-3
pp: 383-387
J.R. Bulgrin , Brooke Army Med. Center, Fort Sam Houston, TX, USA
B.J. Rubal , Brooke Army Med. Center, Fort Sam Houston, TX, USA
T.E. Posch , Brooke Army Med. Center, Fort Sam Houston, TX, USA
J.M. Moody , Brooke Army Med. Center, Fort Sam Houston, TX, USA
ABSTRACT
One reason why automated heart sound analysis remains unfeasible may be the inadequacy of conventional spectral techniques in representing the nonstationary, multicomponent characteristics of phonocardiograms. This study compares several generalized time-frequency distributions (GTFDs) applied to intracardiac phonocardiograms (ICP) obtained at rest in six patients using catheter-mounted transducers. ICPs were bandpass filtered (50-500 Hz) and digitized at 4 kHz. The TFDs employed in this study were the binomial transform (BT), Zhao-Atlas-Marks (ZAM) distribution, minimum cross-entropy (MCE) distributions and the spectrogram. The BT and MCE representations in particular show improved concentration of ICP energy in time-frequency vs. the spectrogram. These findings suggest that several GTFDs may prove useful in the design of automated auscultation systems.<>
INDEX TERMS
biomedical measurement, medical signal processing, time-frequency analysis, statistical analysis, signal representation, transforms, minimum entropy methods, spectral analysis, patient diagnosis, cardiology, bioacoustics
CITATION

J. Bulgrin, B. Rubal, T. Posch and J. Moody, "Comparison of binomial, ZAM and minimum cross-entropy time-frequency distributions of intracardiac heart sounds," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 383-387.
doi:10.1109/ACSSC.1994.471481
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