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课程设计写了利用MATLAB进行语音采集的分析的小程序，供大家参考。 ：）
注意：音频文件要和Matlab工程文件放在一起。
第一段程序：读取录制的一段音频进行时域频域分析并生成图片。
%123.m4a是我录制的音频文件名，使用时要改成自己的音频文件名 [yy,fs]=audioread('123.m4a');%读入音频文件 grid
on; %网格线 hold on; %设置图像保持 YY=fft(yy);%对语音进行傅里叶变换 subplot(2,1,1);
plot(yy,'b');%语音时域波形 title('语音时域波形'); subplot(2,1,2); plot(abs(YY),'b');%语音频域波形
title('语音频域波形'); sound(yy,fs);%播放语音
第二段程序：生成噪声，对噪声进行时域频域分析：
noise=0.1*randn(161791,2);%调用随机函数产生噪声 NOISE=fft(noise);%对噪声进行傅里叶变换
sound(noise,fs);%播放噪声 subplot(2,1,1); plot(noise,'b');%噪声时域波形 title('噪声时域波形');
subplot(2,1,2); plot(abs(NOISE),'b');%噪声频域波形 title('噪声频域波形');
第三段程序：语音信号加入噪声。分析频域时域波形。
[yy,fs]=audioread('123.m4a');%读入音频文件 noise=0.1*randn(161791,1);%调用随机函数产生噪声
yynoise=noise+yy; YYNOISE=fft(yynoise); subplot(2,1,1);
plot(yynoise,'b');%音频加噪声时域波形 title('时域波形'); subplot(2,1,2);
plot(abs(YYNOISE),'b');%音频加噪声频域波形 title('频域波形'); sound(yynoise,fs);%播放加入噪声的音频
