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The most suitable method for detecting a modulated signal (2·5 + 5 cos ωmt) cos ωmt is—
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- envelope circuit
- synchronous detector
- ratio detector
- Both (A) and (B)
- envelope circuit
Correct Option: B
Given modulated signal
s(t) = (2·5 + 5 cos ωmt) cos ωc t
or
s(t) = 2·5 (1 + 2 cos ωmt) cos ωct
Since here modulation index, μ = 2 > 1. Hence signal can’t be detected by envelop detector and synchronous detector.
Hence alternative (B) is the correct choice.
