Question

3. Consider the AM and DSBSC modulated signals given below V_{AM} = V_c(1 + V_m sin(?_m t))sin(?_c t) V_{DSBSC} = V_c V_m sin(?_m t) sin(?_c t) a. By expanding the equations for the AM and DSBSC modulated signals, determine the frequency spectrum of the two types of modulation. You may find the following useful: 2 sin(A) sin(B) = cos(A - B) - cos(A + B) a. What is the bandwidth of the AM modulated signal and what is the purpose of the constant 1? Explain the importance of the knowledge of the AM spectrum for communications engineering. b. In the Amplitude Modulation (AM), if the carrier is at a frequency of 549 kHz and the modulating signal contains three tones at 1kHz, 2kHz and 3kHz of amplitudes 2.0, 0.5 and 1.0 respectively, sketch the spectrum of AM signal. Is it necessary to transmit both side bands? Explain. Total Question 2 - 25 marks

          3. Consider the AM and DSBSC modulated signals given below

V_{AM} = V_c(1 + V_m sin(?_m t))sin(?_c t)
V_{DSBSC} = V_c V_m sin(?_m t) sin(?_c t)

a. By expanding the equations for the AM and DSBSC modulated signals, determine the frequency spectrum of the two types of modulation. You may find the following useful:

2 sin(A) sin(B) = cos(A - B) - cos(A + B)

a. What is the bandwidth of the AM modulated signal and what is the purpose of the constant 1? Explain the importance of the knowledge of the AM spectrum for communications engineering.

b. In the Amplitude Modulation (AM), if the carrier is at a frequency of 549 kHz and the modulating signal contains three tones at 1kHz, 2kHz and 3kHz of amplitudes 2.0, 0.5 and 1.0 respectively, sketch the spectrum of AM signal. Is it necessary to transmit both side bands? Explain.

Total Question 2 - 25 marks

3. Consider the AM and DSBSC modulated signals given below

VAM = Vc(1 + Vm sin(?m t))sin(?c t)
VDSBSC = Vc Vm sin(?m t) sin(?c t)

a. By expanding the equations for the AM and DSBSC modulated signals, determine the frequency spectrum of the two types of modulation. You may find the following useful:

2 sin(A) sin(B) = cos(A - B) - cos(A + B)

a. What is the bandwidth of the AM modulated signal and what is the purpose of the constant 1? Explain the importance of the knowledge of the AM spectrum for communications engineering.

b. In the Amplitude Modulation (AM), if the carrier is at a frequency of 549 kHz and the modulating signal contains three tones at 1kHz, 2kHz and 3kHz of amplitudes 2.0, 0.5 and 1.0 respectively, sketch the spectrum of AM signal. Is it necessary to transmit both side bands? Explain.

Total Question 2 - 25 marks

Added by Manuel A.

Question

Please give Ace some feedback