Energy signals and power signals

27.9.10
Before going to the next topic ie.Properties of discrete time signals we will just skim through the concept of power and energy signals.
Energy of a signal
Energy of a signal x(n) is given by
E= sigma n=-infinity to infinty |x(n)|square
A signal is said to be energy signal if the energy of signal is finite, in that case power of the signal will be zero.

Power of a signal
Power of a signal is given by
limit N tends to infinity 1/2N+1 sigma n=-N to N |x(n)|square
A signal is power signal if power is finite, in that case the energy of signal will be infinity.

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