PhysicsA carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage (in volt ) of the modulating signal in order to have a modulation index of 75%?

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage (in volt ) of the modulating signal in order to have a modulation index of 75%?

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    Solution:

    Given, peak voltage of carrier wave V0  =12 V
    Modulation index μ=75%=75100
    We know that
    Modulation index
    μ=Peakvoltage  ofmodulating  signal(Vm)Peak  Voltage of carrier wave(V0)
    So, peak voltage of modulating signal,
     Vm=μ×Peakvoltage=75100×12=9V
     

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