The process of super imposing information onto a carrier wave is called
Superimposing information onto carrier called modulation.
Ref: NCERT Physics Class 12 Chapter 15 Communication Systems
#modulation
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The carrier wave in the modulation is in the form of:
Carrier wave high frequency sinusoidal, c(t)=Ac sin(ωc t).
Ref: NCERT Physics Class 12 Chapter 15 Communication Systems
Modulation is required
Modulation required for long-distance transmission, antenna size, multiplexing.
Ref: NCERT Physics Class 12 Chapter 15 Communication Systems
