the energy spectral density (esd) of a real signal is even symmetric. is it correct
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The statement is correct.
The Energy spectral density of a real signal is always an even symmetric function of the frequency.
Energy spectral density shows how the energy of a function is distributed with the frequency.
E=∫|x(t^2)|dt with limit -∞ to ∞
Therefore by the property of integration, whatever might be the value of the energy function, the result of the integration is always even.
Hence it is correct that the The Energy spectral density of a real signal is always an even symmetric function of the frequency.
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