Question

Define Modulation. Name three different types of modulation used to modulate any information.

Answer 1

"Modulation is defined as the precess by which some characteristics, usually amplitude, frequency or phase, of a carrier is varied in accordance with instantaneous value of some other voltage, called the modulating voltage."

TYPES OF MODULATION :-

1)"Modulation is defined as the precess by which some characteristics, usually amplitude, frequency or phase, of a carrier is varied in accordance with instantaneous value of some other voltage, called the modulating voltage."

2)Frequency Modulation
Frequency modulation is a change in the carrier frequency (fc) with all other factors remaining constant. 

3)Phase Modulation
Phase modulation is a change in the carrier phase angle (θ ). The phase angle cannot change without also affecting a change in frequency. Therefore, phase modulation is in reality a second form of frequency modulation. 

4)Pulse Modulation
In the Pulse modulation, the continuous signal is converted into a series of pulses, each proportional to the amplitude of the signal and corresponding in time to it. 

Answer 2

HEY MATE HERE IS YOUR ANSWER:-

MODULATION:-
Modulation is the process of superimposing electrical audio signal on high frequency carrier wave.
it is of three types
1. Amplitude modulation
2. Frequency modulation
3. Phase modulation.

HOPE IT HELPS