The audio frequencies get added to the base frequency of the radio wave in such a way that the distance between a low and high frequency remains the same. For example, if the chosen radio frequency is 1 MHz, you encode an 8 kHz audio signal as 1,008,000 Hz. The receiver is able to shift the spectrum down in a couple of steps. An audio channel has a limited space allocated for it, and the sound might appear muffled as the highest frequencies get cut off.
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