How to plot magnitude and phase spectrum of the function
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MUHAMMAD RAHMAT ASMAT
le 16 Juin 2020
Réponse apportée : Usman
le 4 Déc 2023
Hye i really confuse on how much method to write the code to plot magnitude and phase. Below is my function.
X(z)=z / (z-1)^2
Any idea how to start beside plot?
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Star Strider
le 16 Juin 2020
Try this:
z = tf('z');
X = z / (z-1)^2;
bode(X)
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Star Strider
le 16 Juin 2020
I have no idea what you are doing, and I cannot run your code. I cannot imagine how you get a transfer function straight out of a decimated signal, or what ‘calculate the spectrum of the decimated signal using Z-transform technique’ refers to.
If you are estimating a transfer function from the input to and output of a discrete (sampled) system in either the time-domain or frequency-domain, you can either use the System Identification Toolbox functions (there are several that could apply), or the Signal Processing Toolbox invfreqz function. You will need to experiment with whatever functions you choose to use to get the result you want.
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Deepak Gupta
le 16 Juin 2020
Star Strider has given the answer but just FYI:
X = tf([1 0], [1 -2 1]);
bode(X), grid
This will work too.
You can know more about bode plots here:
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Deepak Gupta
le 16 Juin 2020
It creates z-tranfer too. If we give sampling period 0.1s then you will get same result. i.e. tf([1 0], [1 -2 1], 0.1)
Usman
le 4 Déc 2023
Validate magnitude and phase spectrum for x(t) = e−atu(t) for a > 1 and 0 < a < 1. write code for matlab
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