In signal processing and identification, the concept of energy and power of a signal are often used.

The energy over *t* = ∞ and *t* = − ∞ expanded in resistance (*R*) after applying a voltage *e*(*t*) can be expressed as

This energy is called as normalized energy for *R* = 1Ω.

Therefore, the energy in a signal *f*(*t*) by analogy we can write

The signal is said to be energy signal if the energy is finite.

For energy signal, and it always satisfies the absolute integrability criterion ...

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