基于matlab/FDATool的语音信号滤波处理

Filter Design of Voice Signals Based on Matlab/FDATool

提出一种用于语音信号处理的基于matlab/FDATool的的FIR滤波器设计方法.该方法首先通过Matlab产生两个高频的正弦波噪声,加入到语音信号中;然后,根据信号与噪声的频谱特点,选择合适的窗函数,利用FDATool工具箱设计出所需要的FIR数字滤波器;利用FIR滤波器对混入噪声的信号滤波,得到滤波后的语音信号.利用MATLAB的FDATool工具进行数字滤波器设计,能使原来繁琐的滤波器程序设计过程变得简单可行,使得教学过程变得简单易懂.

An voice signal method based on Matlab/FDATool is presented to improve the convertional design.Firstly,a noise of two higher frequency sine wave is generated and added to the voice signal recorded by the Matlab software.Secondly,according to the frequency of the noisy and voice signal,Selecting proper window function and designing the FIR filter are complated.At last,filtering the noisy audio signal,the voice signal is obtained from the output.The fiter design used by matlab/FDATool can make the complicated filter design easier and make teaching process understandable.