Discussion
In full-carrier amplitude modulation the carrier's
Answer: A
Amplitude modulation varies the carrier amplitude in step with the message while its frequency and phase stay fixed, so the message appears as the envelope of the transmitted waveform. Varying the frequency instead gives frequency modulation, and varying the phase gives phase modulation; both are angle modulations and behave quite differently in bandwidth and in noise. Varying two parameters at once is not a standard scheme and would make demodulation ambiguous.
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