用LabVIEW实现对输入音频滤波达到降噪效果后通过滤波处理，回复原正弦信号，欢迎参阅。。(LabVIEW to achieve the input audio filter to achieve noise reduction effect, through the filtering process, reply to the original sinusoidal signal, welcome to see..)

本程序演示了用labview如何产生随机噪声，并对其进行谱分析和相关分析和滤波的过程(This procedure demonstrates the use of LabVIEW how to generate random noise, and its spectral analysis and correlation analysis and filtering process)

labview设计的巴特沃斯滤波器，参数可自由选择。读取TXT文件数据，显示滤波先后的波形及频谱。labview代码中结合了matlab代码(The Butterworth filter designed by LabVIEW is free to choose parameters. Read the TXT file data, showing the waveform and spectrum of the filter successively. The LabVIEW code com

采用声卡进行声音采样，通过自适应滤波器进行主动消噪。(Sound sampling is conducted by sound card, and active noise cancellation is performed by adaptive filter.)

用LabVIEW做的一个简单示波器程序，把噪声信号和正弦信号混合后的波形进行滤波(A simple oscilloscope program made by LabVIEW filters the mixed waveform of noise signal and sinusoidal signal.)