wavwrite注意事项

前几天群里有人提出一个问题:MATLAB里,同样频率的信号写入/读取,为什么频率感觉不同?

 测试code:

fs = 2000;
f0 = 20;
t = 0:1/fs:1;
subplot 211
signal = sin(2*pi*t*f0);
plot(t,signal);hold on;
wavwrite(signal,fs,'test.wav');
data = wavread('test.wav');
plot(t,data,'r--');

subplot 212
signal = 3*sin(2*pi*t*f0);
plot(t,signal);hold on;
wavwrite(signal,fs,'test.wav');
data = wavread('test.wav');
plot(t,data,'r--');

  结果:

幅度放大之后,信号失真,也难怪频率听起来不同了。看一看wavwrite特性:

为了让信号不失真,可以采取两个办法:1)信号归一化;2)利用NBITs=32设置:

修改:

wavwrite(signal,fs,32,'test.wav');
posted @ 2017-05-21 11:01  LeeLIn。  阅读(1405)  评论(0编辑  收藏  举报