小波去噪matlab程序-5页.doc

转帖小波去噪matlab程序*clearclc%在噪声环境下语音信号的增强%语音信号为读入的声音文件%噪声为正态随机噪声sound=wavread(c12345.wav);count1=length(sound);noise=0.05*randn(1,count1);for i=1:count1signal(i)=sound(i);endfor i=1:count1y(i)=signal(i)+noise(i);end%在小波基db3下进行一维离散小波变换coefs1,coefs2=dwt(y,db3); %低频 高频count2=length(coefs1);count3=length(coefs2);energy1=sum(abs(coefs1).2);energy2=sum(abs(coefs2).