Given a signal $$ x(t)=-2\operatorname{rect}\left(\frac t4\right) $$

  • What is the energy of signal $-x(t + 1)$?
  • What are the steps needed to find the energy?

1 Answer 1


Here's a definition of the energy of a signal from Wikipedia: https://en.wikipedia.org/wiki/Energy_(signal_processing) For your specific signal, I recommend to draw the original signal and then the transformation. Finally, just calculate the squared magnitude and the area under it.

These are plots of the steps I mentioned (from Matlab): enter image description here

As you can see in the last plot, the energy is basically the area under the rectangle, which is in this case 4*4=16.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.