Question
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.
Solution
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.
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.
