Question

Amplitude Modulated wave is ________

(a) Sum of carrier and modulating wave

(b) Product of carrier and modulating wave

(c) Difference of carrier and modulating wave

(d) Sum of carrier and its product with modulating wave

I have been asked this question during an online interview.

I need to ask this question from Single Tone Modulation topic in section Amplitude Modulation of Analog Communications

Answer 1

Correct option is (a) Sum of carrier and modulating wave

Easy explanation: The modulation of a carrier wave by varying its amplitude with respect to amplitude of baseband signal is known as amplitude modulation. It is represented as,

s(t) = [1 + mx(t)] c(t),

where, x(t) =  Modulating Wave, m=Modulating Index

            c(t) = Carrier Wave = Ac (Cos ωc) t

Thus, Amplitude Modulated wave is the Sum of carrier and its product with modulating wave.