1.

The Fourier series coefficient of time domain signal x (t) is X[k] = jδ[k-1] – jδ[k+1] + δ[k+3] + δ[k-3], the fundamental frequency of the signal is ω=2π. The signal is ___________

A. 2(cos 3πt – sin πt)
B. -2(cos 3πt – sin πt)
C. 2(cos 6πt – sin 2πt)
D. -2(cos 6πt – sin 2πt)
Answer» D. -2(cos 6πt – sin 2πt)


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