Question

What Is Frequency Deviation In FM?

Answer 1

Frequency modulation

Frequency modulation is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing.

1. The frequency of a sinusoidal wave can be defined as the number of complete oscillations made by any element per unit of time.
2. Frequency deviation in FM is defined as the way to describe the difference between the minimum and maximum extent of a frequency modulated signal and the carrier frequency.
3. The FM signal’s instantaneous frequency changes with time around the carrier frequency ${\mathrm{\omega }}_{\mathrm{C}}$.
4. This indicates that the FM signal’s immediate frequency varies depending on the modulating signal. Frequency deviation is the maximum change in instantaneous frequency from the average frequency ${\mathrm{\omega }}_{\mathrm{C}}$.
5. We can calculate the frequency deviation by
   $\mathrm{f}\left(\mathrm{t}\right)={\mathrm{f}}_0+∆\mathrm{f}\left(\mathrm{t}\right)$
   where,$\mathrm{f}\left(\mathrm{t}\right)$ is the instantaneous frequency, ${\mathrm{f}}_0$ is the unmodulated carrier frequency and $∆\mathrm{f}\left(\mathrm{t}\right)$ is the absolute maximum of the difference between the unmodulated carrier wave.