What is modulation?

Modulation can be defined as the method of combining an audio frequency signal with a radio frequency carrier wave. The audio frequency is also known as modulating wave and the resultant wave produced is called as modulated wave. Throughout the modulation, some characteristics of the carrier wave are varied in time with the modulating signal and are accomplished by combining the two.

Modulation

Modulation

There are three types of modulations which are given below,

  • Amplitude modulation
  • Frequency modulation
  • Phase modulation
Amplitude modulation

In amplitude modulation, the information or audio frequency signal changes the amplitude of the carrier wave without changing its frequency or phase.

Amplitude modulation

Amplitude modulation

Frequency modulation

In frequency modulation, the information signal changes the frequency of the carrier wave without changing its amplitude or phase.

Frequency modulation

Frequency modulation

Phase modulation

In phase modulation, the information signal changes the phase of the carrier wave without changing its other two parameters.

 

Phase modulation

Phase modulation

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