DSP Format Discrete Transfer Function Matlab
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Hi,
If I have a discrete transfer function, defined using sys = filt(num,den)
In Matlab, how to I plot the response of the filter.
Can freqz be used? If so, how do I pass the filt(num,den) to freqz to obtain the bode diagram?
Thank you
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Paul
2022-1-28
You can use freqz() if you want, Because filt() returns a tf object from the Control System Toolbox, bode() or bodeplot() functions in that toolbox can also be used
num = [1 2];
den = [1 2 3 4];
sys = filt(num,den);
w = logspace(-2,pi,100);
[m,p] = bode(sys,w);
figure
subplot(211);
semilogx(w,db(squeeze(m)));
subplot(212)
semilogx(w,180/pi*angle(exp(1j*squeeze(p*pi/180))))
h = freqz(sys.num{:},sys.den{:},w);
figure;
subplot(211);
semilogx(w,db(abs(h)));
subplot(212);
semilogx(w,angle(h)*180/pi)
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