Question

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.

Answer 1

Answer:

modulated signal is obtained by superposing a modulating sig

Answer 2

Two basic modes of communication are :

1. Point to point
2. Broadcast

Amplitude Modulation is defined as the system in which the maximum amplitude of the carrier wave is made proportional to the instantaneous value or amplitude of the modulating or baseband signal.

• In the first picture we can see the signal x(t) which is the baseband or the modulating signal which contains information and we have to transmit that signal.
• And in the second picture we see c(t), which is the carrier signal which has a fixed frequency, upon which the baseband signal has to be superimposed.
• In amplitude modulation the baseband signal or the information upon the carrier signal in the form of amplitude variations of the carrier signal. Now the information to be transmitted is contained in the amplitude variations of the carrier signal.
• The resulting signal formed after superimposing modulating signal on the carrier signal is called the amplitude modulated signal.

So, this is how Amplitude Modulation process takes place.