So far we have seen different types of pulse modulation. In this article, we are going to talk about Pulse Code Modulation (PCM).
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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.
