Sketch the AM signal φAM(t) = Acosωct + m(t)cosωct for the periodic signal m(t) shown in Figure 1 corresponding to the following modulation indices. (a) μ = 0.25; (b) μ = 1; (c) μ = 1.25; and (d) μ = ∞.
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Sketch the AM signal for the periodic signal shown in Figure 1 corresponding to the following modulation indices.
(a) ; (b) ; (c) ; and (d) .
![P2: Sketch the AM signal [A+m(t)]cosωct for the signal m(t) shown below corresponding to the modulation index by selecting a corresponding A assuming a carrier frequency of 80 Hz : (a) μ = 0.5 (b) μ = 1, what is the bandwidth of the modulated signal (c) μ = 2. Draw the positive envelope. (d) μ = ∞. What is the bandwidth of the modulated signal](https://www.doubtrix.com/uploads/editor/6352097545nfPirtFfCC.jpg)
![An amplitude modulated (AM) signal, xAM(t), is represented by the following expression: xAM(t) = [Ac + m(t)]cos(2πfct + π). The carrier frequency, fc = 107 Hz and the power in the modulation signal, m(t), is represented as Pm. (i) Derive an expression for the power efficiency, η, of the AM signal, xAM(t), in terms of Pm. (ii) Given that the modulation index, μ = 0.5, determine the power efficiency, η, of the modulating signal m(t) shown in Figure B1 c overleaf. Figure B1 c: Triangular waveform as modulating signal, m(t).](https://www.doubtrix.com/uploads/editor/7357981963vsAWMIuOad.png)
![(a) An AM signal is given by φAM(t) = [20 + m(t)]cos(2πfct). Find the maximum value of the amplitude Am of the modulating signal m(t), as shown in the following figure, such that no distortion in the modulated signal would occur. Find also the corresponding modulation index. The figure for Problem 01 . (b) A baseband signal is given by m(t) = cos100t cos200t and the carrier signal is given by C(t) = 10cos5000t. Find and sketch the spectra of the DSB-SC modulated signal. Find also the upper sideband and the lower sideband. (c) What is the major drawback of SSB-SC and how can we overcome it?](https://www.doubtrix.com/uploads/editor/8592024853PjFUzTsBBt.png)