Modulation index of FM
The modulation index of FM is given by
Options:
μ = frequency deviation/ modulating frequency
μ = modulating frequency /frequency deviation
μ = modulating frequency/ carrier frequency
μ = carrier frequency / modulating frequency
Correct Answer: μ = frequency deviation/ modulating frequency
Explanation:
Modulation index is the measure of how much the modulation parameter changes from its un modulated value.The modulation index of FM is given by
μ = frequency deviation/ modulating frequency
= Δf/ fm
Where Δf is the peak frequency deviation i.e. the deviation in the instantaneous value of the frequency with modulating signal.
fm is the value of modulating frequency
