1.

Write any two points of difference between amplitude modulation and frequency modulation.

Answer»
No.Amplitude ModulationFrequency Modulation
i.In AM, alternation in amplitude of the desired signal amounts to marked distortionNoise can be easily minimised in FM system.
ii.In AM, use of an excessively large modulating signal may result in distortion because of over modulation.No restriction is placed on the modulation index. The instantaneous frequency deviation is proportional to the instantaneous magnitude of the signal.
iii.The average power in modulated wave is greater than that contained in unmodulated wave.The average power in frequency modulated wave is the same as that contained in the unmodulated wave.


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