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.