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FM (Frequency Modulation) is a method of transmitting radio signals where the frequency of the carrier wave is varied in proportion to the amplitude of the input signal (such as voice or music). This is different from AM (Amplitude Modulation), where the amplitude of the carrier wave changes while the frequency remains constant.
In FM, the carrier frequency is modified according to the variations of the audio signal.
This allows the information (sound) to be carried over long distances without significant distortion.
For example, when you tune into 101.1 FM, the number represents the frequency of the carrier wave in megahertz (MHz).
Better sound quality – FM has higher fidelity and less static interference.
Noise resistance – Since most interference affects amplitude, FM signals remain clearer.
Stereo broadcasting – FM is widely used for high-quality music broadcasting.
Commercial FM radio broadcasting (usually in the 88–108 MHz range)
Two-way radio communication (walkie-talkies, police radios, aviation)
Television sound transmission
Data communication (such as modems in older systems)
FM was invented by Edwin Howard Armstrong in the 1930s to overcome the limitations of AM radio. His innovation revolutionized broadcasting by offering clear, static-free sound.
AM (Amplitude Modulation): Amplitude varies, frequency fixed, more prone to noise.
FM (Frequency Modulation): Frequency varies, amplitude constant, less noise, better sound.
FM = Frequency Modulation
Invented by Edwin Armstrong
Used in 88–108 MHz band for radio broadcasting
Clearer sound & less noise compared to AM
👉 Correct Answer: Option 1 – Frequency Modulation
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