Answer:
In
amplitude modulation, the instantaneous voltage of carrier waves is varied by
the instantaneous voltage of modulating waves. On transmission through a channel
noise signals can also be added, resulting a change in the amplitude of
modulated waves. Due to it, the receiver receives the modulating signal having a
part of noise. However, in frequency modulation, the frequency of carrier waves
is changed as per instantaneous voltage of modulating waves. This can only be
done at the mixing or modulating stage and not while signal is transmitted in
channel. Hence noise does not effect FM signal.
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