Question

According to Parseval’s theorem the energy spectral density curve is equal to?

(a) Area under magnitude of the signal

(b) Area under square of the magnitude of the signal

(c) Area under square root of magnitude of the signal

(d) None of the mentioned

This question was addressed to me during an online exam.

I would like to ask this question from Spectral Density and Autocorrelation topic in portion Signals and Spectra of Digital Communications

Answer 1

Right answer is (b) Area under square of the magnitude of the signal

Best explanation: According to Parseval/s theorem the energy spectral density function can be given as equal to the square of the magnitude of the signal x(t).