Answer Posted / aima khan

The power of a signal is the sum of the absolute squares of its time-domain samples divided by the signal length, or, equivalently, the square of its RMS level. The function bandpower allows you to calculate signal power in one step.    

If we assume for definiteness a unit load (a 1  $Omega$ resistor), then if  $f(t)$ is the voltage across the resistor or the current through the resistor, then the energy dissipated is 
egin{displaymath}E_f = int_{-infty}^infty f^2(t) dt end{displaymath}




If this quantity is finite, then  $f(t)$ is said to be an energy signal . 

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