零相位滤波器在非平稳信号分析中的应用研究

Study on the Application of Zero-Phase Filter to Non-stationary Signal Analysis

对非平稳信号处理中滤波器的选用作了深入研究,发现零相位滤波器在通带范围内能有效消除一般IIR滤波器对非平稳信号产生的相位失真和频率改变.为在非平稳信号处理中,正确选用滤波器提供了参考,同时提高了非平稳信号的分离精度.论述了将零相位滤波器引入到非平稳信号分析中作为抗频混滤波器的必要性和可行性,并在LabVIEW平台下,进行了仿真对比实验.

A profound study is made on the ways to choose filters in non-stationary signal process. It is discovered that Zero-Phase Filter can effectively eliminate the phase distortion and frequency shift of non-stationary signal that caused by IIR filter, which provides a reference for filter＇s selection to non-stationary signal and g＇ready enhances the precision to extract signals from a complex signal. The necessity and feasibility to employ Zero- Phase Filter on non-stationary signal analysis as an anti-frequency-overlap filter are presented and a simulation experiment on LabVIEW is introduced.