Communication Techniques

Communication Techniques


Data is transmitted in the form of electrical signals. The electrical signals are of two types viz., analog and digital. Similarly, data can also be either analog or digital. Based on them, data communication may be of following types:

1. Analog data, analog transmission
e.g.: transmission of voice signals over telephone line

2. Analog data, digital transmission
e.g.: transmission of voice signal after digitization using PCM, delta modulation or adaptive delta modulation

3. Digital data, analog transmission
e.g.: communication using modem

4. Digital data, digital transmission
e.g.: most of present day communication