What are the two main types of modulation used in radio broadcasting?

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The two main types of modulation used in radio broadcasting are Amplitude Modulation (AM) and Frequency Modulation (FM).

Amplitude Modulation (AM) varies the strength of the carrier signal in proportion to the waveform being sent, such as audio signals. This allows for the transmission of sound over long distances, making it a traditional choice for radio talk shows, news, and other forms of audio broadcasting. FM, on the other hand, varies the frequency of the carrier signal, which leads to better sound quality and noise resistance, making it ideal for music and high-fidelity audio broadcasts.

Together, AM and FM cover most conventional radio broadcasting needs, catering to different aspects of the audio experience and listener preferences in a broad spectrum of applications. Other choices mention modulation techniques that apply to digital communications and specific applications but are not standard for traditional radio broadcasting.