Generating a noisy signal and analysis

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ereno simone
ereno simone 2012-8-4
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.

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回答（1 个）

William
William 2012-8-5
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

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