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A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75% ? |
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Answer» Solution :Here , `E_C = 12 V ` , ` m_a = 75%= 0.75 , E_m = ?` We have , `E_("max")=E_m + E_c ` ` E_("min") = E_c -E_m` and `m_a = (E_("max") -E_("min"))/(E_("max") + E_("min"))` `=((E_m + 12) - (12-E_(m)))/((E_m + 12) + (12-E_m))` or ` 0.75 = (2E_m)/(24)` ` or E_m = 0.75 XX 12 = 9V` |
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