Title :
Comparison of binomial, ZAM and minimum cross-entropy time-frequency distributions of intracardiac heart sounds
Author :
Bulgrin, James R. ; Rubal, Bernard J. ; Posch, Theodore E. ; Moody, Joe M.
Author_Institution :
Brooke Army Med. Center, Fort Sam Houston, TX, USA
fDate :
31 Oct-2 Nov 1994
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
Keywords :
bioacoustics; biomedical measurement; cardiology; medical signal processing; minimum entropy methods; patient diagnosis; signal representation; spectral analysis; statistical analysis; time-frequency analysis; transforms; 4 kHz; 50 to 500 Hz; GTFD; Zhao-Atlas-Marks distribution; automated auscultation systems; automated heart sound analysis; bandpass filtered signals; binomial transform; catheter-mounted transducers; generalized time-frequency distributions; intracardiac heart sounds; intracardiac phonocardiograms; minimum cross-entropy distributions; nonstationary multicomponent characteristics; signal representations; spectrogram; time-frequency distributions; Acoustic transducers; Aircraft; Band pass filters; Heart; Instruments; Medical diagnostic imaging; Piezoelectric transducers; Spectrogram; Stethoscope; Time frequency analysis;
Conference_Titel :
Signals, Systems and Computers, 1994. 1994 Conference Record of the Twenty-Eighth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-6405-3
DOI :
10.1109/ACSSC.1994.471481
