Question

The preferred value of the modulation index in the Amplitude modulation system is

Answer 1

Amplitude modulation system -

1. It is a system used in transmitting messages by modulating the amplitude of the wave signal.
2. The modulation index($m$) is defined as the extent to which modulation is done.
3. In other words, the amplitude modulation index describes the amount by which the modulated carrier envelope varies about the static level.
4. It is the ratio of the amplitude of modulating signal($A_m$) to that of the carrier signal ($A_c$)
   $m=\frac{A_m}{A_c}$
5. Modulating signal $A_m$-This signal contains the information that needs to be transmitted
6. Carrier signal $A_c$-This is the signal that is modulated with modulating signal for conveying information
7. The maximum value of m can be 1 and the minimum can be 0.
8. If the level of modulation is raised up above a modulation index of 1, i.e. more than 100% modulation this causes what is termed over-modulation
9. The preferred value should be ranging from 0 to 1 and not succeed at 1 to avoid distortion