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
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