how to feed a signal through a transfer function

2013 3 14
2 个回答
回答已采纳
更新时间：2021 8 18
37 次查看（30 天）

5 个投票

I'm sure this is probably really simple but I can't seem to find it. I have a z transform transfer function, given from tf, and I have an input signal. What i need is to pass the signal though the system and get the output. This is a small excerpt from my very long code that is the part I am stuck on.
if true
% code
%the signal
N = 250;
n = 0:1:N-1;
x1 = 3*cos(20*pi*n/N);
%the transfer function
num = [0.3881 0.3881];
den = [1 -0.4452 0.2700 -0.0486];
fs = 1/250;
hz = tf(num, den, fs)
end
Any help or direction would be greatly appreciated.

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 采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-14
编辑：Azzi Abdelmalek 2013-3-14

2 个投票

You can use lsim function
N = 250;
n = 0:1:N-1;
x1 = 3*cos(20*pi*n/N);
num = [0.3881 0.3881];
den = [1 -0.4452 0.2700 -0.0486];
fs = 1/250;
hz = tf(num, den, fs)
[y,t]=lsim(hz,x1)
stem(t,y)

更多回答（1 个）

Dominik
Dominik 2015-2-22

0 个投票

I have a 2x2 transfer function, 'tf', and want to simulate this system with 2 inputs. every Inputis an array. How can I plo the response of my system? Do i can use lsim too? I get a lot of errors...
thanks a lot for your comments!

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