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The difference between phase and frequency modulation

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The difference between phase and frequency modulation
1. Is purely theoretical because they are same in practice
2. Is too great to make the two systems compatible
3. Lies in the poorer audio response to phase modulation
4. Lies in the definitions of the modulation index
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Correct Answer - Option 3 : Lies in the poorer audio response to phase modulation

Frequency Modulation is the process of varying the frequency of the carrier signal linearly with the message signal.

Phase Modulation is the process of varying the phase of the carrier signal linearly with the message signal.

The difference between phase and frequency modulation lies in the poorer audio response to phase modulation.
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