Discussion :: Communication Systems
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Which of the following cannot be the Fourier series expansion of a periodic signal?
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A.
x(t) = 2 cos t + 3 cos 3t
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B.
x(t) = 2 cos pt + 7 cos t
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C.
x(t) = cos t + 0.5
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D.
x(t) = 2 cos 1.5pt + sin 3.5 pt
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Answer : Option C
Explanation :
x(t) = cos t + 0.5
not satisfies the Dirichlet condition.
The integration of constant term is ∞.
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