Filter Design of Voice Signals Based on Matlab/FDATool

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.