Question

What is Amplitude Modulation?

(a) Change in amplitude of carrier according to modulating signal amplitude

(b) Change in frequency of carrier according to modulating signal amplitude

(c) Change in amplitude of carrier according to modulating signal frequency

(d) Change in amplitude of modulating signal according to carrier signal amplitude

I had been asked this question in class test.

My question is based upon Frequency Domain Description topic in portion Amplitude Modulation of Analog Communications

Answer 1

Right option is (a) Change in amplitude of carrier according to modulating signal amplitude

The explanation: Amplitude modulation is a modulation process in which amplitude of carrier wave is varied with respect to amplitude of the message signal to be transmitted. Whereas, Frequency modulation is a modulation process in which frequency of carrier wave is varied with respect to amplitude of the message signal to be transmitted.