3.6 ENERGY DENSITY AND POWER SPECTRAL DENSITY

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

3.6.1 Energy in a Signal

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

 

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

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

 

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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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