Question

Which of the following are two most important classes of angle modulation?

(a) Amplitude modulation, frequency modulation

(b) Amplitude modulation, phase modulation

(c) Frequency modulation, phase modulation

(d) Single sideband amplitude modulation, phase modulation

This question was addressed to me during an interview.

The doubt is from Angle modulation topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

Answer 1

Correct answer is (c) Frequency modulation, phase modulation

The explanation: The two most important classes of angle modulation are frequency modulation and phase modulation. They provide the ways in which phase of a carrier signal may be varied in accordance with the baseband signal.