engineering recuitment GATE ECE 2023-24 Test Series Communication Systems Angle Modulation Frequency Modulation
Let m1(t) and m2(t) be two message signals and let x1(t) and x2(t) be the corresponding modulated version. Which among the following statements is/are correct?
1
When the combined message signal m1(t) and m2(t) DSB modulates a carrier Ac cos 2πfct, the result is the sum of the DSB amplitude modulated signals x1(t) and x2(t)
2
When the combined message signal m1(t) and m2(t) DSB modulates a carrier Ac cos 2πfct, the result cannot be the sum of the DSB amplitude modulated signals x1(t) and x2(t)
3
When the combined message signal m1(t) and m2(t) frequency modulates a carrier, the modulated signal is equal to the sum of x1(t) and x2(t).
4
When the combined message signal m1(t) and m2(t) frequency modulates a carrier, the modulated signal cannot be equal to the sum of x1(t) and x2(t).