View source for HW1.5 Mark Frankosky ECE301Fall2008mboutin - Rhea

== Signal Energy ==
Signal Energy expended from <math>t_1\!</math> to <math>t_2\!</math> for CT functions is given by the formula <math>E = \int_{t_1}^{t_2} \! |x(t)|^2\ dt</math>

The total signal energy for a signal can be found by taking the limits for the integral <math>t_1\!</math> and <math>t_2\!</math> as <math>-inf\!</math> and <math>inf\!</math> respectively

For DT signals, the total energy is given by the formula <math>E_{inf} = \sum^{inf}_{n=-inf} |x[n]|^2 \!</math>

== Signal Power ==
For CT functions, the power of a signal from <math>t_1\!</math> to <math>t_2\!</math> is given by the function <math>P_{avg}=\frac{1}{t_2-t_1} \int_{t_1}^{t_2} |x(t)|^2\ dt \!</math>

The total signal power is given by the function <math>P_{inf}=\lim_{t->inf}   \frac{1}{2t} \int_{-t}^{t} |x(t)|^2\ dt \!</math>

<math>\sum^{N}_{n=-N}</math>

Total signal power for DT signals is given by the formula <math>P_{inf} = \lim_{N->inf} \frac{1}{2N+1}\!</math>