A phase modulator can be made to create FM indirectly by:
A) ensuring that the audio signal has an amplitude that varies inversely proportional to its frequency.
B) integrating the intelligence signal prior to phase modulation
C) feeding the intelligence signal through a frequency correcting network
D) all of the above

Question

Quizplus · Accepted Answer

All the options provided are methods to create Frequency Modulation (FM) indirectly using a phase modulator. Option A involves amplitude variation inversely proportional to frequency, which affects the phase modulation in a way that mimics FM. Option B involves integrating the intelligence signal, which effectively changes phase modulation into FM. Option C's frequency correcting network also adjusts the input in a manner that results in FM when phase modulated.

A Phase Modulator Can Be Made to Create FM Indirectly