Modulation techniques

Modulation is one of the process in communication. By the modulation only we can achieve long distance communication...

Modulation:
Modulation is defined as change in the carrier signal with respect to message signal is called as modulation...

That means the original signal is transmitted with  the carrier. Then carrier carried signal which is very high frequency signal.

Commonly modulation is great thing by this we can achieve ...
1. Practicality of antenna
  That means with this we can construct less height of antenna..
2.low noise:
By this technique we can achieve low noise
3. Long distance communication

Modulation techniques are mainly two types those are...
1. Analog modulation
2. Digital modulation

1. Analog modulation :
This modulation is performed in the analogue signals.
This modulation is divided into  three types those are...
A. Amplitude modulation
B. Frequency modulation
C. Phase modulation

2. Digital modulation :
 This modulation performed in the digital signals that is this is in binary format.
PCM... Etc are digital modulation techniques.