时频分析方法及其在医学信号处理中的应用

Application of Time Frequency Analysis on Medical Signal Processing

许多生物医学信号的频率分布随着时间迅速变化 ,传统的傅立叶谱分析技术显然不能满足对这类时变信号的分析。通过对一个一维时间或频率信号进行变换 ,其时频表示能够在时间 -频率平面上描述信号的能量分布。实际研究表明 ,时频分析方法能够解决很多生物医学信号问题。

The frequency content of many biomedical signals can change rapidly with time. Conventional Fourier spectral analysis techniques are insufficient for analyzing the time-varying spectral content of these signals. By mapping a one-dimensional function of time (or frequency), the time-frequency representation can localize the signal energy in both the time and frequency directions. It has been shown that many biomedical signal problems may benefit from time-frequency analysis. The basic method of time-frequency analysis and its application in biomedical signals processing are introduced.