CBSE Class 12-science Answered
Draw a plot of the variation of amplitude with 
for an amplitude modulated wave. Define modulation index. State its importance for effective amplitude modulation.
for an amplitude modulated wave. Define modulation index. State its importance for effective amplitude modulation.
Asked by Topperlearning User | 09 Jul, 2014, 11:12: AM
Expert Answer
Let ωm be the frequency of modulating signal and ωc be the frequency of carrier wave.The plot of variation of amplitude ω for an amplitude modulated wave is given below:
Modulation index:- It is defined as the ratio of amplitude of modulating signal to the amplitude of carrier wave. Mathematically it can be written as
where A m is the amplitude of modulating signal and A c amplitude of carrier wave.
The quality of the transmitted signal is determined by the index of modulation 
.
The variation in the carrier amplitude Ac is small for a small modulation index and vice-versa.
Hence, for effective modulation, the value of 
should be checked and it should be ensured that the modulation index is never greater than unity.
Answered by | 09 Jul, 2014, 01:12: PM
Concept Videos
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Modulation and detection of signals - Part 1 ...
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Modulation and Detection of Signals - Part 2
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