Modulation
In communication for perfect transmission of a signal to longer distances, the process used is called modulation.
The process of modulation involves
1) Message signal(LF)
Low-frequency signal or baseband signal.
2)carrier signal (HF)
High-frequency signal.
Modulation is changing the parameters [Amplitude-A, Frequency-F,phase-Ø] of the signal according to instantaneous values of the age signal.
Need for modulation
•Antenna size decreases.
•No mixing of the •Extent communication range.
•Bandwidth adjustment is easy.
•Quality of recovery signal is high.
•Multiplexing of signals is easy.
