巴特沃斯滤波器_再别秀了的博客

```matlab
function Hd = buttle
Fs = 1200;           % 采样频率
Fpass = 0.5;         % 通带频率
Fstop = 50;          % 阻带频率
Apass = 1;           % 通带波动(dB)
Astop = 5;           % 阻带衰减(dB)
match = 'stopband';  %波段匹配
%构造滤波器对象命名方法为butter
h  = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd = design(h, 'butter', 'MatchExactly', match);
```
```matlab
function Hd = buttle
Fs = 1200