Discussion
When the modulating signal controls the amplitude of a carrier wave, it is known as :
Answer: B
It is amplitude modulation.
In amplitude modulation the instantaneous amplitude of a high-frequency carrier is made to vary in step with the modulating (message) signal, while the carrier frequency stays fixed:
\[ s(t) = A_{c}[1 + \mu m(t)]\cos\omega_{c}t \]
In frequency modulation the message varies the carrier's frequency, and in phase modulation its phase, with the amplitude constant in both. Pulse amplitude modulation varies the heights of a train of pulses rather than the amplitude of a continuous carrier wave.
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