Modulation Index (FM)
By DarthVader
Date: 2025-11-24
Topic: 254 see comments
Post views: 37
Modulation Index (FM)
Two terms that are closely related and that help determine the bandwidth of an FM signal are the frequency deviation and the modulation index.
β = \(\frac{Δ f}{f_m}\)
β = (\frac{Δ f}{f_m}\)
Where:
β = modulation index
Δ f = frequency deviation
fm = highest frequency component of the modulating signal
The frequency deviation, Δf, can be defined as the maximum deviation of the FM-modulated frequency from the carrier frequency. So a modulating signal that doesn’t vary much in amplitude will result in a smaller Δf
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