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Wave Optics
Question
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Define term modulation. Name three types of modulation used for a message signal using a sinusoidal continuous carrier wave. State briefly the meaning of any one of these. 

Answer

The process where we superimpose a low audio frequency message or information signals called modulating signals onto a high frequency wave called the carrier wave is known as modulation. The resultant signal wave so obtained is known as the modulated wave. 

The three types of modulation are:
1. Amplitude modulation (AM), 
2. Frequency modulation (FM), and
3. Phase modulation. 

Amplitude modulation: In amplitude modulation, the amplitude of the carrier wave varies in accordance with the amplitude of the audio frequency modulating signal. 

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