How does amplitude modulation (AM) differ from frequency modulation (FM)?

Amplitude modulation (AM) and frequency modulation (FM) are two fundamental techniques used in wireless communication to encode information in signals, particularly in broadcasting audio and video content.

The correct response highlights that in amplitude modulation, the information signal modifies the amplitude of the carrier wave while keeping its frequency constant. This means that the strength (or amplitude) of the wave varies in accordance with the information being transmitted, such as sound signals. On the other hand, frequency modulation alters the frequency of the carrier wave in response to the information signal, keeping the amplitude constant. This method of modulation enables FM to provide better sound quality and resistance to noise compared to AM, which is more susceptible to interference.

Understanding the distinction between these two modulation methods is crucial for grasping the fundamentals of wireless communication, as they each have their unique properties and applications, influencing the choice of modulation based on specific requirements of transmission quality, range, and the nature of the signals being sent.