首先利用录音工具录制一段语音信号，并人为加入一单频噪声，然后对信号进行频谱分析以确定所加噪声频率，自定相应技术指标，设计一个满足指标的巴特沃斯滤波器进行滤波去噪处理，最后比较滤波前后的波形和频谱并进行分析。-Firstly recording tool to record a voice signal, and artificially added to a single frequency noise, then the signal spectrum analysis to determine the applied frequency noise, self-corresponding Technical indicators designed to meet the target of a Butterworth filter for filtering de-noising processing, and finally compare waveforms and spectrum before and after filtering and analysis.