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Communication SystemsAmplitude Modulation

For a single-tone AM wave, modulation index m is commonly equal to?

  • AMessage amplitude divided by carrier amplitude
  • BCarrier amplitude divided by message amplitude
  • CCarrier frequency divided by message frequency
  • DMessage frequency multiplied by carrier frequency
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Correct Answer: A. Message amplitude divided by carrier amplitude
Explanation: For standard sinusoidal AM, m=Am/Ac when the modulating and carrier amplitudes are expressed consistently.
Reference: Standard communication systems: amplitude modulation
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