key term - Frequency modulation

Definition

Frequency modulation is a method of encoding information in a carrier wave by varying the instantaneous frequency of the wave. It is widely used in radio broadcasting and signal processing.

5 Must Know Facts For Your Next Test

1. Frequency modulation (FM) changes the frequency of the carrier wave according to the amplitude of the input signal.
2. The bandwidth required for FM signals is generally larger than that for amplitude modulation (AM) signals.
3. FM is less susceptible to noise and interference compared to AM, making it preferable for high-fidelity broadcasts.
4. The maximum deviation of frequency in an FM signal directly affects its bandwidth, described by Carson's Rule: $BW = 2(\Delta f + f_m)$ where $\Delta f$ is peak deviation and $f_m$ is the highest modulating frequency.
5. FM radio typically operates in the VHF range from 88 to 108 MHz.

Review Questions

Related terms

Amplitude Modulation: A technique used in electronic communication, most commonly for transmitting information via a radio carrier wave by varying its amplitude.

Carrier Wave: A waveform (usually sinusoidal) that is modulated with an input signal for the purpose of conveying information.

VHF: $Very High Frequency$, a range of electromagnetic waves with frequencies between 30 MHz and 300 MHz.