Generating a noisy signal and analysis

Greetings.

I have an assignment about Signals and Systems. I am completely new to MATLAB so i need extreme help on the assignment below.

Generate a noisy signal with sinusoidal components defined at 100 Hz and 300 Hz (3rd Harmonic)

a) Calculate (slow) its time and spectral variation b) Calculate frequency resolution (deltaf) c) Design a low pass filter to remove the 3rd harmonic and check its performance.

I need the code and the graphs to do this assignment. Any help is appreciated. Thank you.

[Ryan]

What have you tried so far?

Answer 1

[William]

try this:

x = linspace(1,1,1000);
z= randn(1,1000);
y = sin(x)+z;
plot(x,y)

just remove the "z" and you will get a normal sign wave. Add the Z and you will get a sin wave with a normal (Gaussian) distobution with mean 1 added to it.

Hope that helps