# Representing graphically an analog signal?

1. Jul 16, 2006

### esmeco

I was wondering,how do I represent graphically an analog signal components in time and frequency using an equation for example like this:

v(t)=3 + 1.414cos(w0t) - 1.414sin (w0t) + 2cos(2w0t + 5pi/2)

2. Jul 16, 2006

### Andrew Mason

Calculate v(t) for different values of t. Plot the values for v(t) on the vertical axis for values of t on the horizontal axis.

AM

3. Jul 17, 2006

### esmeco

But in the equation,what are the values that correspond to the amplitude and frequency?

4. Jul 17, 2006

### BoTemp

It may be more enlightening to use the variable x = w0*t. x varies from 0 to 2*pi; one needn't know what w0 is. The angular frequency of the equation you wrote is w0; amplitude I'm not sure about. If you have to plot it anyway, might as well do that and find the maximum deviation from 3 (the DC value).

5. Jul 17, 2006

### Claude Bile

Plotting the frequency domain is simple - just plot the Fourier transform. Because the frequency components are discrete, you will get a series of delta functions of varying heights (depending on the amplitude of each component).

Claude.