Saved Bookmarks
| 1. |
A DSB-SC signal is generated using the carrier cos(2πfc t + \(\theta\)) and modulating signal x(t). The envelop of the DSB-SC signal is (a) x(t) (b) |(t)| (c) Only positive portion of x(t) (d) (t) cos \(\theta\) |
|
Answer» (b) |(t)| Given Carrier c(t) = cos(2πfc t + θ) Modulating signal m(t) = x(t) DSB SC modulated signal is given by m(t).s(t) = cos(2πfc t + θ)x(t) = x(t) { cos2πfc t cos θ - sin2πfc t sin θ} = x(t) cos2πfc t cosθ – x(t) sin2πfc t sin θ = x(t) |
|