Topic: Communication Systems
A carrier voltage is simultaneously modulated by two sine waves causing modulation indices of 0.4 and 0.3. The overall modulation index is
- A. 0.35
- B. 0.7
- C. 0.5
- D. Can not be calculated unless the phase relations are known
Answer: C. 0.5
Explanation: $m=\sqrt{(m_{1})^{2}+(m_{2})^{2}}=\sqrt{(0.4)^{2}+(0.3)^{2}}=0.5$