Frequency detection of the first heart sound based on wavelet transformation.
- Author:
Xiao HU
1
;
Weilian WANG
Author Information
1. Information School, Yunnan University, Kunming 650091.
- Publication Type:Journal Article
- MeSH:
Algorithms;
Heart Sounds;
Humans;
Phonocardiography;
methods;
Signal Processing, Computer-Assisted
- From:
Journal of Biomedical Engineering
2003;20(3):491-493
- CountryChina
- Language:Chinese
-
Abstract:
According to the valvular theory, the vibrations affected by the mitral and tricuspid valves closure in early systole produce the first heart sound (S1). S1 usually includes many frequency components. In this paper, a method using the multi-resolution analysis of wavelet transformation is recommended for detecting the frequency range of S1. First, S1 was decomposed into different levels on frequency. Then the normalized Shannon energy of the different levels was calculated. The level containing the maximum energy is the major components' level of S1. The frequency range of this level is the major frequency range of S1. The frequency range of S1 was successfully detected by the method.
