# Laplace to Fourier conversion + plotting

#### AlexMak

Joined Jan 2, 2018
32
Hello, so I have a signal that I need to convert to frequency. I have the signal in laplace transform now and I heard that I can convert it to fourier transform by s = jw. The problem is I can't plot the signal that way. Is there something I'm missing / doing wrong ?

#### MrAl

Joined Jun 17, 2014
6,838
Hello,

If i understand you right then you have to take your expression and plot the magnitude and phase shift for a frequency of choice 'w' where w=2*pi*f.

#### AlexMak

Joined Jan 2, 2018
32
Hello,

If i understand you right then you have to take your expression and plot the magnitude and phase shift for a frequency of choice 'w' where w=2*pi*f.
I must turn the signal to frequency and plot it. Im not aware of the magnitude and phase shift as they might have a different meaning in my language. I understood that you can link the laplace to the fourier transform and obtain the frequency signal by replacing s=iw but i still dont know how to plot it.

#### simozz

Joined Jul 23, 2017
104
When you plot the power spectrum in the frecueny domain, you plot $$|X(\text{i}\omega)|^2$$.

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