小波变换和傅立叶变换在系统诊断中的应用

Using Fourier and Wavelet Transform in Diagnosis

对小波变换和傅立叶变换的特点进行了简要的阐述 ,并结合具体的系统诊断实例 ,介绍了在数字滤波、数字信号分析、信号特征提取等方面的应用技术 .文中给出了采用 MATL AB语言编写的程序模块及程序运行结果 ,并绘出了各个处理阶段的波形 。

This paper briefly introduces the properties of Fourier and Wavelet Transform in digital signal processing,and demonstrates the functions of checking spectral characteristics and filtering out noises from a corrupted signal,also presents an application of wavelet in detecting irregular points of a signal in a real system diagnosis.