AM (Amplitude Modulation): In AM broadcasting, the amplitude (strength) of the radio wave is varied in accordance with the audio signal. This means that the amplitude of the radio wave changes in proportion to the amplitude of the sound wave being transmitted. AM radio signals are susceptible to interference from electrical noise, which can cause static or crackling sounds in the audio output.
FM (Frequency Modulation): In FM broadcasting, the frequency of the radio wave is varied in accordance with the audio signal. This means that the frequency of the radio wave changes in proportion to the frequency of the sound wave being transmitted. FM radio signals are less susceptible to interference from electrical noise, resulting in clearer and higher-quality audio output compared to AM radio.
FM radio operates at a higher frequency range (88-108 MHz) than AM radio (535-1705 kHz), which allows for higher-fidelity transmission and better sound quality. FM radio also has a wider bandwidth than AM radio, allowing for the transmission of stereo signals.
In summary, AM and FM are different modulation techniques used in radio broadcasting. AM radio uses amplitude modulation, while FM radio uses frequency modulation. FM radio offers better sound quality and is less susceptible to interference compared to AM radio.