If modulation index is greater than 1

The baseband signal is not preserved in the envelope of the AM signal

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The recovered signal is distorted

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It is called over modulation

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All of the above

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Solution

The correct option is D All of the above
Modulation index is the measure of extent to which the parameter of the carrier is varied in accordance with the modulating signal. If modulation index is greater than 1, or the modulation percentage is more than 100%, it is called over modulation.
The baseband signal is not preserved in the envelope of the AM signal and therefore, the recovered signal is distorted at the output of the receiver.

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When a sinusodial carrier signal is amplitude modulated by a siusodial message signal m_{1} (t), the modulation index of the resultant AM signal is 0.80. When this AM signal is simultaneously modulated by one more sinusoidal message signal m_{2} (t) the total power of the Am signal become double. The modulation index of the Am signal obtained due to m_{2} (t) alone will be_______

x (t) = 2 c o s (2 π f_{m} t)

x_{c} (t) = A_{c} c o s (2 π f_{c} t)

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