Define modulation index. Why is it generally kept less than one?

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Modulation index: specifies the amount of energy of carrier wave used in the modulation. In amplitude modulation the ratio between the amplitude of message wave and the amplitude of carrier wave is known as modulation index, which is given by − μ Am/AC
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Modulation index: specifies the amount of energy of carrier wave used in the modulation. In amplitude modulation the ratio between the amplitude of message wave and the amplitude of carrier wave is known as modulation index, which is given by − μ Am/AC
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