Official PYQ · 2006Set 1 · Q75Analog CommunicationsMCQ1 mark

GATE EC 2006 Set 1 Q75 — Analog Communications

Common Data for Questions 74, 75:
Let $g(t)=p(t)^{*} p(t)$ , where * denotes convolution and $p(t)=u(t)-u(t-1)$ with $u(t)$ being the unit step function

An Amplitude Modulated signal is given as
$x_{\mathrm{AM}}(t)=100(p(t)+0.5 g(t)) \cos \omega_{c} t$
in the interval $0 \leq t \leq 1$ . One set of possible values of the modulating signal and modulation index would be

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Answer: A

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Published 10 Oct 2026

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