Electronics and Communication Engineering - Exam Questions Papers - Discussion

Discussion Forum : Exam Questions Papers - Exam Paper 14 (Q.No. 3)
X(t) is a stationary process with the power spectral density Sx(f) > 0 for all f. The process is passed through a system shown below.

Let Sy, (f) be the power spectral density Y(t). Which one of the following statements is correct?
Sy(f) > 0 for all f
Sy(f) = 0 for |f| > 1kHz
Sy(f) = 0 for f = nf0, f0 = 2kHz, n any integer
Sy(f) = 0 for f = (2n + 1)f0 = 1 kHz, n any integer
Answer: Option
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