speech_enhancement2.m

说明小波消噪的理论

clear
clc
%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('Voice.wav');
count = length(sound);
noise = 0.05*randn(1,count);
y=sound' + noise;
% 获取消噪的阀值
[thr,sorh,keepapp] = ddencmp('den','wv',y);   
% 对信号进行消噪
yd = wdencmp('gbl',y,'db4',2,thr,sorh,keepapp);
subplot(121);
plot(sound);
title('原始语音信号');
subplot(122);
plot(yd);
title('去噪后的语音信号');