用matlab设计低通滤波器

来源：百度知道 编辑：UC知道 时间：2024/09/21 21:40:39
偶是一菜鸟，刚刚学习数字信号处理，要用matlab设计一个低通滤波器，请问哪位高手会做，给小弟一点指点吧，多谢了，最好是能给出源代码，在下的邮箱是wangxingyue1987@163.com，有什么可以发到我的邮箱里面，谢谢了！！

IIR butterworth的，fdatool产生的：

function Hd = test1
%TEST1 Returns a discrete-time filter object.

%
% M-File generated by MATLAB(R) 7.0.4 and the Signal Processing Toolbox 6.3.
%
% Generated on: 25-Jun-2009 15:15:00
%

% Butterworth Lowpass filter designed using FDESIGN.LOWPASS.

% All frequency values are in Hz.
Fs = 48000; % Sampling Frequency

Fpass = 9600; % Passband Frequency
Fstop = 12000; % Stopband Frequency
Apass = 1; % Passband Ripple (dB)
Astop = 80; % Stopband Attenuation (dB)
match = 'stopband'; % Band to match exactly

% Construct an FDESIGN object and call its BUTTER method.
h = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd = butter(h, 'MatchExactly', match);

% [EOF]