InterviewSolution
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InterviewSolution
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In amplitude modulation, the modulation index mu, is kept less than or equal to 1 because.A. `m gt 1`, will result in interference between carrier frequency and message frequency, resulting into distortionB. `m gt 1`, will result in overlapping of both side bands resulting into loss of informationC. `m gt 1`, will result in change in phase between carrier signal and message signalD. `m gt 1`, indicates amplitude of message signal greater than amplitude of carrier signal resulting into distortion |
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Answer» Correct Answer - B::D The modulation index (m) of amplitude modulated wave is `m=("amplitude of message signal"(A_(m)))/("amplitude of carrier signal"(A_(c )))` If `m gt 1`, then `A_(m) gt A_(c )`. In this situation, there will be distortion of the resulting signal of amplitude modulated wave. Maximum modulation frequency `(m_(f))` of `A_(m)` wave is `m_(f) = (Deltav_("max"))/(v_(m)("max"))` `=("frequency deviation")/("maximum frequency value of modulating wave")` If `m_(f) gt 1`, then `Deltav_("max")gt v_(m)`. It means, there will be overlapping of both side bands of modulated wave resulting into loss of information. |
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