Which modulation technique is commonly used for AM radio broadcasting?

Amplitude Modulation is the modulation technique widely used for AM radio broadcasting. This method works by varying the amplitude of the radio wave in accordance with the audio signal being transmitted. In AM broadcasting, the frequency of the carrier wave remains constant, while the strength of the signal fluctuates to match the sound waves of the audio content. This allows the amplitude variations to represent the audio information, making it suitable for voice and music transmission.

Users of AM radio can receive these signals with relatively simple receivers, which is part of the reason for its long-standing use in public broadcasting. AM radio has a long-range propagation ability as well, allowing it to be received over much greater distances compared to other modulation methods, particularly during nighttime. While other modulation techniques offer advantages in terms of sound quality and bandwidth efficiency, for traditional broadcasting purposes, amplitude modulation remains the standard.