Time frequency analysis of canine heart sounds

Author

Lovell, Nigel

Author_Institution

Graduate Sch. of Biomed. Eng., Univ. of New South Wales, Sydney, NSW

Volume

2

fYear

1999

fDate

36434

Abstract

Six different time frequency distributions (TFDs) have been used to analyze the first and second heart sounds. These TFDs have been applied to both simulated heart sound data and to experimental phonocardiogram data (N=6) recorded in the anesthetized dog. Using the distributions, no significant systematic rising frequency component was observed in either the first or second heart sounds. As revealed using the continuous wavelet transform (CWT), the energy of the lower frequency components are found to decrease more rapidly than the higher frequency components as the myocardium is progressively depressed by applying increasing concentrations of the gaseous anesthetic agents, halothane and isoflurane

Keywords

acoustic signal processing; bioacoustics; cardiovascular system; medical signal processing; time-frequency analysis; wavelet transforms; anesthetized dog; canine heart sounds; continuous wavelet transform; first heart sounds; gaseous anesthetic agents; halothane; higher frequency components; isoflurane; lower frequency components; myocardium; phonocardiogram data; second heart sound; simulated heart sound data; time frequency analysis; time frequency distributions; Acoustic testing; Anesthetic drugs; Biomedical engineering; Cardiology; Continuous wavelet transforms; Energy resolution; Heart; Myocardium; Spectrogram; Time frequency analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint

Conference_Location

Atlanta, GA

ISSN

1094-687X

Print_ISBN

0-7803-5674-8

Type

conf

DOI

10.1109/IEMBS.1999.804105

Filename

804105