Signal x(t) = 5 (1 + 2 cos 2000 πt) can be recovered by

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Signal x(t) = 5 (1 + 2 cos 2000 πt) can be recovered by
(i) envelop detector
(ii) synchronous detector
(iii) square law

1. (i) and (ii) only.
2. (i) and (iii) only.
3. (ii) and (iii) only.
4. All.

Correct Option: C

The given signal
x(t) = 5 (1 + 2 cos 2000 πt) cos 10⁶t
On comparing this equation with standard AM modulated wave equation
x(t)=A_c (1 + μ cos ω_mt) cos ω_ct
we get, μ = 2, which is > 1
Hence it cannot be recovered by the envelop detector.
Therefore, choice (C) is the correct choice.