Electronics and Communication Engineering - Signals and Systems - Discussion
Discussion Forum : Signals and Systems - Section 2 (Q.No. 50)
50.
A rectangular pulse train s(t) is shown in figure is convolved with the signal cos2(4p x 103t). The convolved signal will be a
Answer: Option
Explanation:
First find the Fourier series of given pulse that is
And fm from (2) ⇒ 4 kHz
When we multiply x1(t) and x2(t - t)
We get term like fs ± fm, 2fs ± fm, 3fs ± fm, 4fs ± fm and fs = 10 kHz fm = 4kHz
Hence from above relation (10+4) kHz ⇒ 14 kHz signal will be present in x(t).
Discussion:
2 comments Page 1 of 1.
Sahay said:
2 years ago
fs = 10x10³Hz
fm = 2x2x10³ = 4 x 10 ³ Hz.
Now sampled signal must have frequencies.
n * 10 * 10³ ± 4 * 10³Hz
Hence 14Hz is the only option.
fm = 2x2x10³ = 4 x 10 ³ Hz.
Now sampled signal must have frequencies.
n * 10 * 10³ ± 4 * 10³Hz
Hence 14Hz is the only option.
Annaluruv said:
7 years ago
It is DC signal.
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