基于LabVIEW的数字滤波器性能研究  

Research on Digital Filter Performance Based on LabVIEW

作　　者：李馨悦 LI Xinyue(School of Telecommunications Engineering,Xidian University,Xi’an 710126,China)

机构地区：[1]西安电子科技大学,通信工程学院,陕西西安710126

出　　处：《微型电脑应用》2024年第5期239-242,共4页Microcomputer Applications

摘　　要：为了研究滤波器的滤波性能,采用LabVIEW设计了滤波器性能研究系统。通过LabVIEW中的波形生成函数输出幅值及频率可调的正弦波和白噪声2种信号,白噪声与正弦波叠加,通过滤波器输出正弦波信号,通过FFT输出正弦波的频谱特性。仿真结果表明:叠加有较小幅值噪声的正弦波信号通过一定的滤波器能够被不失真地滤波输出;当噪声的幅值较大时,滤波器输出的正弦波就会失真。调节滤波器的抽头数可以不失真的恢复出正弦波信号。所设计的系统界面直观、操作简单,可以应用于教学和科研。In order to study the filter performance,LabVIEW is used to design a filter performance research system.The sinusoid and white noise signals with adjustable amplitude and frequency are output through the waveform generating function in LabVIEW.The white noise is passed through the filter,it is superimposition with sine wave,and the sine wave signal is output by the filter,and then the spectral characteristics of the sinusoid are output through FFT.The results show that the sinusoidal signal with small noise can be filtered without distortion through a certain filter.When the amplitude of noise is large,the output of the filter is distorted,the sinusoidal signal can be recovered without distortion by adjusting the tap number of filter.The designed system has intuitive interface and simple operation,which can be applied to teaching and scientific research.

关 键 词：波形生成函数 LABVIEW FFT 滤波器 

分 类 号：TN91[电子电信—通信与信息系统]