In amplitude modulation, bandwidth is ____________ the audio signal frequency?
Correct answer: C. Twice
- A. Thrice
- B. Four times
- C. Twice
- D. None of the above
Explanation
For a highest modulating frequency of f_m, an AM signal has sidebands at f_c minus f_m and f_c plus f_m. Their separation is therefore 2f_m, making the bandwidth twice the audio signal frequency.
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