基于数字滤波的计算机控制系统测试信号的降噪处理

计算机控制系统的测试信号一般是用模拟式传感器测得的,因此这些信号不可避免的要受到各种干扰噪声的污染。针对系统的测试信号,必须进行相应的滤波处理。基于数字滤波技术中的两种典型方法:FFT和小波分析法,讨论了如何能够降低噪声对测试信号的影响,在MATLAB平台上仿真实现了FFT和小波分析法在降噪中的作用,并分析了其优缺点,最后表明小波降噪在测试信号的处理中有着明显的优势。

Test SignaI Noise Reduction of Computer ControI System Based on DigitaI FiItering

Test signaI of the computer controI system is usuaI y measured by anaIog sensor,so these signaIs are inevitabIy poI ut-ed by various noise.The test signaI of system must be carried out the processing through fiIter.This paper is based on two typicaI methods of digitaI fiIter technoIogy：FFT and waveIet anaIysis,discussed how to reduce the infIuence of the noise sig-naIs,the simuIation on MATLAB pIatform prove that the function of FFT and waveIet anaIysis in noise reduction,and anaIyzes their advantages and disadvantages.