Physics · Communication Systems
In amplitude modulation, the modulation index m is generally kept less than or equal to 1 because:
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- 1m > 1 results in interference between the carrier frequency and message frequency, causing phase reversal.
- 2m < 1 results in overlapping of both sidebands leading to serious attenuation.
- 3m > 1 results in a total change in phase between the carrier signal and message signal.
- 4m > 1 indicates that the amplitude of the message signal is greater than that of the carrier signal, which results in overmodulation and distortion.✓
Correct answer
m > 1 indicates that the amplitude of the message signal is greater than that of the carrier signal, which results in overmodulation and distortion.
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