Carson’s rule for calculation of bandwidth of FM signal

Carson’s rule is used to calculate

Options:

Bandwidth of FM signal
Signal to noise ratio
Modulation index
Noise figure

Correct Answer: Bandwidth of FM signal

Explanation:

According to Carson’s rule, the bandwidth required is twice the sum of the maximum frequency deviation and the maximum modulating signal frequency. Or,
B=2(Δf +f_m) Hz.

The ratio of maximum peak frequency deviation and the maximum modulating signal frequency is termed as

Options:

Frequency deviation
Deviation ratio
Signal to noise ratio
Frequency spectrum

Correct Answer: Deviation ratio

Explanation:

In Frequency Modulation, Deviation ratio is the ratio of maximum peak frequency deviation and the maximum modulating signal frequency. Mathematically, the Deviation Ratio (DR) is given by
DR= Δf _(max) /f_{m (max)}