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Answer Posted / sanyasi rao allanki
normally any signal will have three basic characteristics
i.e., amplitude, frequency and phase. a low frequency
signal cannot be transmitted over longer distances. so it
has to be sent using some high frequency sigal, which is
generally said to be carrier signal, used to carry the low
frequency signal from one place to the other place. it
doesnot covery any information. once signal is reached to
receiver the carrier signal will be removed at the
destination end.
so any one of the characterstics of the carrier signal is
varied in accordance with the instantaneous value of the
message signal or baseband signal is said to be modulation.
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