Pros and Cons of DSB-LC v.s. DSB-SC Pros and Cons of DSB-LC v.s. SSB-LC
The spectrum of a DSB-SC signal is shown in the figure below. The carrier is given by: Acos(2*1007). What is the modulating signal m(t)? Hul DSB-C spectrum(1).png DSB SC spectrum.pdf
4. A DSB-SC signal is modulated by m(t) = 7coswyt + 3coswqt, with f1 = 0.2 kHz, and Ac = 5. (25 points) a. Write an expression for the DSB-SC signal and sketch a picture of this wave. b. Evaluate and sketch the spectrum for this DSB-SC signal. C. Find the value of the normalized average power. d. Find the value of the normalized PEP.
Amplitude modulation: double side band supressed carrier (DSB-SC) why is DSB-SC used for radio signals? which frequency components would carry useful information and which ones would cause unnecessary interference?
Assume m(t) is a 10 Hz square wave, with amplitude 1, and that AM-DSB-C is the modulation scheme used with fc = 100Hz. AM Modulator AM Demodulator m(t) SAM-DSB-sc(t) mdemod(t) LPF cos2nfct cos21fct S Figure 1 P1. For the system shown in Figure 1, sketch the signals mſt), mde mod (t) in the time and frequency domain c(t), and AM-DSB-SC
1) Show that any scheme that can be used to generate DSB-SC can also generate AM and any scheme that can be used to demodulate DSB-SC can also demodulate AM. Is the converse true in both cases? Explain. 1) Show that any scheme that can be used to generate DSB-SC can also generate AM and any scheme that can be used to demodulate DSB-SC can also demodulate AM. Is the converse true in both cases? Explain.
(2) Find the output of the DSB-SC demodulator shown in Fig.Q2 below, if the local oscillator at the receiver has a phase difference of $ . Also find the power of the signal v,(t) Product modulator (mixer) DSB-SC Modulated Signal vít) Low-Pass Filter Demodulated Signal v.(t) s(t)= m(t)4, cos(21f1) cos (21 f1+0) Local Oscillator Fig. 22
Problem A DSB-SC AM signal is modulated by the signal m(t) = cos(4000st) - cos(1000nt). The modulated signal is u(t) = 200 m(t) cos(21tfct), where f=1 MHz. 1. Determine and sketch the spectrum of the AM signal. 2. Determine the average power in the frequency components 3. Find a resonable choice of R and C to design an envelope detector for this DSB-SC AM signal.
AM Modulator AM Demodulator m(t) SAM-DSB-Sc(t) mdemod(t) LPF cos2nfct cos2nfct Figure 1 P1. For the system shown in Figure 1, sketch the signals m(t), SAM-DSB-sc(t), and mde mod(t) in the time and frequency domain, assuming m(t)=cos 20ra and that AM- DSB-SC is the modulation scheme used with f. = 100Hz
In a DSB AM Determine the modulation index of four signals using a carrier signal of 17khz and a signal of .5sin(300*2pi)+sin(800*2pi)+.6sin(2000*2pi)+.4sin(4000*2pi)