摘要
心音是一种非平稳信号,用时频分析方法可以获得这种信号的一些重要的特征.为此提出了不同时频表达在心音研究中的几个性能指标:频谱的聚集度,时间包络的覆盖率、均方误差和规则性.基于这些指标比较了心音信号的短时傅立叶变换、连续小波变换、S变换、W igner-V ille分布等时频表达的性能,并给出了具体应用的例子.
Heart sound is non-stationary signal, some of its important characteristics can be obtained by time - frequency analysis method. The criteria of different time-frequency representation concentricity of spectrogram, coverage, MSE and regularity of time envelope axe proposed, the performances of Short-time Fourier transform, Wigner - Ville distribution, continuous wavelet transform, and S transform in study on heart sound are compared based on these criteria , and concrete example of application is given.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期116-119,共4页
Journal of Chongqing University
基金
国家自然科学基金资助项目(30270377)
关键词
心音
时频表达
连续小波变换
S变换
heart sound
time - frequency analysis
short - time Fourier transform
continuous wavelet transform
