Question

In phase modulation, according to the information signal, a parameter of the carrier wave which is varied, is

• A. Phase shift
• B. Phase shift as well as amplitude
• C. Amplitude
• D. Amplitude as well as frequency

Hint:

In phase modulation, the information signal alters the phase of the carrier wave, which results in a variation of the phase shift.

Answer 1

The Correct Option is A

Step 1: Understanding phase modulation.
In phase modulation (PM), the phase of the carrier signal is varied in accordance with the information signal. The amplitude and frequency of the carrier wave remain constant, while the phase changes with the information signal. Step 2: Conclusion.
Thus, the parameter that is varied in phase modulation is the phase shift, which corresponds to option (A).