EC > GATE 2025 > Analog Modulation
Consider a message signal m(t) which is bandlimited to [-W, W], where W is in Hz. Consider the following two modulation schemes for the message signal:
Double sideband-suppressed carrier (DSB-SC): fDSB(t)=Acm(t)cos(2πfct)
Amplitude modulation (AM): fAM(t)=Ac(1+μm(t))cos(2πfct)
Here, Ac and fc are the amplitude and frequency (in Hz) of the carrier, respectively. In the case of AM, μ denotes the modulation index.
Consider the following statements:
(i) An envelope detector can be used for demodulation in the DSB-SC scheme if m(t)>0 for all t.
(ii) An envelope detector can be used for demodulation in the AM scheme only if m(t)>0 for all t.
Which of the following options is/are correct?
Double sideband-suppressed carrier (DSB-SC): fDSB(t)=Acm(t)cos(2πfct)
Amplitude modulation (AM): fAM(t)=Ac(1+μm(t))cos(2πfct)
Here, Ac and fc are the amplitude and frequency (in Hz) of the carrier, respectively. In the case of AM, μ denotes the modulation index.
Consider the following statements:
(i) An envelope detector can be used for demodulation in the DSB-SC scheme if m(t)>0 for all t.
(ii) An envelope detector can be used for demodulation in the AM scheme only if m(t)>0 for all t.
Which of the following options is/are correct?
Correct : a
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