Unipolar encoding is a simple line code used in digital communication systems. In this encoding scheme:
- Binary 1 is represented by a positive voltage (e.g., +5V).
- Binary 0 is represented by zero volts (no voltage).
Here's a brief summary:
1. Positive Voltage (Binary 1): The signal remains at a constant positive voltage level during the duration of the bit.
2. Zero Volts (Binary 0): The signal drops to zero volts during the duration of the bit.
Advantages:
- Simplicity: Unipolar encoding is straightforward and easy to implement.
- Direct mapping: Each bit directly corresponds to a voltage level.
Disadvantages:
- DC Component: Unipolar encoding has a non-zero average amplitude due to the constant positive voltage. This creates a direct current (DC) component in the signal.
- Incompatibility: Unipolar signals cannot pass through media that do not support the DC component (e.g., capacitors or transformers).
In summary, unipolar encoding is a basic method for representing digital data using voltage levels, but its limitations make it less commonly used in modern communication systems. Other encoding schemes, such as bipolar encoding or Manchester encoding, address some of these drawbacks. 🌐🔌