What is the significance of using frequency modulation (FM) in communication systems?

The significance of using frequency modulation (FM) in communication systems primarily lies in its ability to offer better sound quality and reduce interference compared to amplitude modulation (AM). FM works by varying the frequency of the carrier wave in accordance with the information signal, rather than varying the amplitude as in AM. This frequency variation makes FM signals less susceptible to noise and interference, which is particularly important in communication systems where clarity and quality are paramount.

One of the key advantages of FM is its inherent resistance to amplitude-based noise, which is commonly encountered in communication channels. This results in a clearer audio quality, especially when receiving signals over longer distances or in environments with potential interference. As a result, FM is often chosen for broadcasting high-fidelity audio, such as music on radio stations, where sound quality is critical.

The other options discuss aspects of FM but do not capture as accurately the primary significance. For example, while FM is generally easier to demodulate than AM in certain contexts, this does not encapsulate the primary benefits of sound quality and interference reduction. Similarly, FM does not involve varying the amplitude of the wave, and it typically requires more bandwidth than AM, which further highlights the advantage of FM in quality rather than bandwidth efficiency.