Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

amplitude modulation (AM) - Forms of amplitude modulation, Example, Modulation index, Amplitude modulator designs

wave radio signal

In wave motion, the altering of wave amplitude in a systematic way, leaving frequency unchanged. In AM radio, an electrical signal is used to modulate the amplitude of the broadcast carrier radio wave. A radio receiver reproduces the signal from the modulated wave by demodulation.

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