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Define modulation index. Why is it kept low? What is the role of a bandpass filter? |
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Answer» Modulation index is the ratio of the amplitude of modulating signal to that of carrier wave. \(\mu = \frac{A_m}{A_c}\) Modulation index is kept low in order to avoid distortion. The low frequency modulating signal is mixed with high-frequency carrier wave, the distortion is restricted due the high-frequency carrier wave for modulation index lying between 0 and 1. Bandpass filter rejects low and high frequencies and allows a band of frequencies to pass through. |
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