Write two basic modes of communication. Explain the process of amplitude modulation. Draw a schematic sketch showing how amplitude modulated signal is obtained by superposing a modulating signal over a sinusoidal carrier wave.

Solution

The two basic modes of communication are:

Point-to-point communication
Broadcast communication

In amplitude modulation, the amplitude of the carrier wave is varied in accordance with the amplitude of the modulating wave.

Let, the carrier wave be given by,
$straight c left parenthesis straight t right parenthesis space equals space straight A subscript straight c sinω subscript straight c straight t$

Modulating signal is given by,
$straight m left parenthesis straight t right parenthesis space equals space straight A subscript straight m sinω subscript straight m straight t$
$straight omega subscript straight m$ is the angular frequency of the message signal.

Therefore, modulated signal is given by,
$Error converting from MathML to accessible text.$
$Error converting from MathML to accessible text.$

Amplitude modulated signal is produced by superposing a modulating signal over a sinusoidal carrier wave. The process is illustrated in the fig. below.

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Wave Optics

Write two basic modes of communication. Explain the process of amplitude modulation. Draw a schematic sketch showing how amplitude modulated signal is obtained by superposing a modulating signal over a sinusoidal carrier wave.

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