JEE Main202228 Jul 2022Morning ShiftPhysicsCommunication SystemActual
In the case of amplitude modulation to avoid distortion the modulation index μ should be :
Options
- Aμ ≤ 1
- Bμ ≥ 1
- Cμ = 2
- Dμ = 0
Correct answer
A. μ ≤ 1
Step-by-step solution
The modulation index of an amplitude modulated signal is defined as the measure or extent of amplitude variation about an un-modulated carrier. Modulation index is μ = A m A c To avoid distortion, μ ≤ 1 because μ > 1 will result in interference between career frequency and message frequency, resulting into distortion.