The use of wavelet packets to improve the detection of cardiac sounds from the fetal phonocardiogram

Author

Jiménez, A. ; Ortiz, MR ; Pena, MA ; Charleston, S. ; Aljama, AT ; González, R.

Author_Institution

Univ. Autonoma Metropolitana, Mexico City, Mexico

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

463

Lastpage

466

Abstract

This work evaluates the influence of preprocessing to defect time references of the first and second cardiac sounds (S1 and S2). Four fetal phonocardiogram (PDGf) signals with different signal to noise ratio (SNR) were simulated (150 cycles, 50-400 Hz) using acquired cardiac sounds. The signals were decomposed by Mutual Wavelet Packets and the best tree was de-noised before the signal reconstruction. The PCGf envelope was obtained by Hilbert Transform (HT), and the starting (S), maximum (M), and ending (E) points were detected for S1 and S2. The results were compared without and with the preprocessing stage, finding that the proposed method improves the SNR and the detection of the heart sounds

Keywords

acoustic signal detection; bioacoustics; cardiology; medical signal detection; obstetrics; signal reconstruction; wavelet transforms; 50 to 400 Hz; Hilbert transform; acquired cardiac sounds; cardiac sounds detection; fetal phonocardiogram; heart sounds detection; mutual wavelet packets; preprocessing stage; signal to noise ratio; Acoustic sensors; Acoustic transducers; Envelope detectors; Fetal heart; Fetal heart rate; Noise reduction; Phase measurement; Signal reconstruction; Signal to noise ratio; Wavelet packets;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology, 1999

Conference_Location

Hannover

ISSN

0276-6547

Print_ISBN

0-7803-5614-4

Type

conf

DOI

10.1109/CIC.1999.826008

Filename

826008