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Definition of "energy-density spectrum" |
for a continuous time signal x(t) the function |X(w)|², where X(w) is the Fourier Transform of x. The function |X(w)|² is referred to as an energy-density spectrum because Δ|X(w0)|2 is proportional to the energy in the signal x in a bandwidth Δ around the frequency w0. Analogously, a discrete time signal x[n] has an energy-density spectrum |X(Ω)|² |
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