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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?
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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.

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