Question

What is the modulation index?

Answer 1

1. In a carrier signal, the extent to which modulation is done is represented by the modulation index.
2. In amplitude modulation, it is defined as the ratio of the amplitude of modulating signal to that of the carrier signal. It is mathematically given as-$m=\frac{A_m}{A_c},\mathrm{where}m\mathrm{is}\mathrm{modulation}\mathrm{index},A_m\mathrm{is}\mathrm{amplitude}\mathrm{of}\mathrm{modulating}\mathrm{signal}\mathrm{and}{A}_c\mathrm{is}\mathrm{amplitude}\mathrm{of}\mathrm{carrier}\mathrm{signal}.$
3. The value of $m$ is kept less$1$.