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Communication SystemsFrequency Modulation

For narrowband FM, the modulation index beta is generally?

  • AMuch less than 1
  • BExactly 1 in every case
  • CMuch greater than 1
  • DInfinite
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Correct Answer: A. Much less than 1
Explanation: Narrowband FM is characterized by a small modulation index, beta<<1, so higher-order sidebands are negligible.
Reference: Standard communication systems: narrowband FM
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