What method of transmitting a radio signal changes the frequency of the carrier wave while keeping its amplitude constant?

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Frequency modulation is the method of transmitting a radio signal that changes the frequency of the carrier wave while keeping its amplitude constant. In this technique, the information being sent is encoded in variations of the frequency of the carrier wave, meaning that as the input signal fluctuates, the frequency of the output signal also varies. This allows for a more robust transmission, as frequency modulation is less susceptible to noise and interference compared to other methods such as amplitude modulation.

The consistency of amplitude in frequency modulation means that the strength of the signal does not change, which helps maintain the quality of the transmitted audio or data, even in the presence of noise. This characteristic makes frequency modulation particularly suitable for high-fidelity audio broadcasts, such as FM radio stations, where sound quality is a priority.