## Saturday, November 14, 2009

### Energy and Power Signals

x(t) (or x[n]) is said to be an energy signal (or sequence) if and only if 0 < E < infinity, and
so P = 0.

x(t) (or x[n]) is said to be a power signal (or sequence) if and only if 0 < P < infinity, thus
implying that E = infinity.

Signals that satisfy neither property are referred to as neither energy signals nor power
signals.

Note that a periodic signal is a power signal if its energy content per period is finite, and
then the average power of this signal need only be calculated over a period