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GATE ECE 2008 | Question-20

Consider the amplitude modulated (AM) signal $A_{c} \cos \omega_{c} t+2 \cos \omega_{m} t \cos \omega_{c} t$. For demodulating the signal using envelope detector, the minimum value of $A_{c}$ should be

  1. $2$
  2. $1$
  3. $0.5$
  4. $0$
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