So far we have seen different types of pulse modulation. In this article, we are going to talk about Pulse Code Modulation (PCM).
Pulse Code Modulation (PCM)
Pulse Code Modulation (PCM) is a different type of pulse modulation because it is a digital process. Though it uses sampling techniques. The PCM generator produces a series of numbers or digits instead of a pulse train having varying parameters such as amplitude(PAM) or width(PWM) or position(PPM).
Each of these digits almost always in a binary code represents the approximate amplitude of the signal sample at that instant.
Advantages of Pulse Code Modulation
- Immune to noise. Therefore, transmission characteristics are almost independent of distance.
- It can carry a mixture of traffic. For example, Telegraph data, telephony, encoded information, etc.
- It can increase the capacity of single telephone channel over cable pair by MUX.
- It makes cryptography storage and other forms of digital processing possible.
- Its signal characteristics allow easy access to electronic switching.