y[n] = x[n] - x[n-1] x[n-2] I need to find a) Find the transfer function. b) Give the impulse response. d) Sketch the frequency respo

I need to find a) Find the transfer function. b) Give the impulse response. d) Sketch the frequency response. How to do it?

[n] = x[n] - x[n-1] + x[n-2]

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Rhea Shah]

clc;

clear all;

close all;

num=[1.0 -1.0 1.0]

den=[1.0]

y=impz(nu,den);

stem(y);

[Steven Lord]

Okay. What is your specific question about where you're having difficulty?

[Rhea Shah]

Is the approach corect?

Answer 1

[Birdman]

Try this:

z=tf('z',0.001);
Gz=1-z^-1+z^-2;
%%transfer function
Gs=d2c(Gz,'tustin')
%%impulse response
figure(1);
impulse(Gs)
%%frequency response
figure(2);
bode(Gs)

[Rhea Shah]

tf is giving an error

[Birdman]

It is working well in R2019b. Which version are you using?

[Rhea Shah]

R2020a

[Birdman]

Do you have Control System Toolbox installed? Type

ver

in command line and paste the output here.

[Rhea Shah]

Hey thank you so much. I got the impulse and frequency response output. But i am not getting transfer function output as I don't have the tool box installed. I have the 2019a version. Is there some another approach to it?