Communication System Question 10
Question 10 - 01 February - Shift 2
In an amplitude modulation, a modulating signal having amplitude of $X V$ is superimposed with a carrier signal of amplitude $Y V$ in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude $2 Y V$. The ratio of modulation index in the two case respectively will be:
(1) $1: 2$
(2) $1: 1$
(3) $2: 1$
(4) $4: 1$
Show Answer
Answer: (3)
Solution:
Formula: Modulation Index
Modulating Index
$\mu=\frac{A_m}{A_c}$
$\mu_1=\frac{X}{Y}$
$\mu_2=\frac{X}{2 Y}$
$\frac{\mu_1}{\mu_2}=\frac{2}{1}$
