# How to plot the magnitude and phase of a given transfer function(z-domain)?

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Daniel Ramirez 2015년 11월 27일
답변: Aik-Siong Koh 2021년 7월 8일 I tried approacting this by doing the LTI function:
>> z=tf('z'); >> H=0.203*[(1-z^-1)*(1-0.2743*z^-1+z^-2)]/[(1+0.2695*z^-1)*(1+0.4109*z^-1+0.6758*z^-2)]
H =
0.203 z^8 - 0.2587 z^7 + 0.2587 z^6 - 0.203 z^5
-----------------------------------------------
z^8 + 0.6804 z^7 + 0.7865 z^6 + 0.1821 z^5
I don't even know if I'm approacting this right, please I need help in doing this.
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Daniel Ramirez 2015년 11월 28일
I think I did it?
L=1000;
dw=2*pi/L;
w = -pi:dw:pi-dw;
aa=[1,0.6804,0.953486,0.182128];
bb=[0.2031,-0.2588,0.2588,-0.2031];
HH=freqz(bb,aa,w);
mag=abs(HH);title('Magnitude response')
figure
phase=angle(HH);title('Phase response')
plot(w,mag)
plot(w,phase)
The next step that they want me to do is plot the impulse response. So anyone know how to go from the freq domain to the time domain(n)? This is what I'm struggling the most, any help would be appreciated.

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