Electronics and Communication Engineering - Communication Systems - Discussion

Discussion Forum : Communication Systems - Section 1 (Q.No. 17)
17.
Which of the following cannot be the Fourier series expansion of a periodic signal?
x(t) = 2 cos t + 3 cos 3t
x(t) = 2 cos pt + 7 cos t
x(t) = cos t + 0.5
x(t) = 2 cos 1.5pt + sin 3.5 pt
Answer: Option
Explanation:

x(t) = cos t + 0.5

not satisfies the Dirichlet condition.

The integration of constant term is ∞.

Discussion:
11 comments Page 2 of 2.

Rohit prakash said:   1 decade ago
We can say that it's a Fourier series so it should contain sin or cosine terms.


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