Study of Line Decoder

Theory:                   

Decoding is the process of converting code into plain text or any format that is useful for subsequent processes. Decoding is the reverse of encoding. It converts encoded data communication transmissions and files to their original states.

Types of Line Decoding:

Like encoding, there are 4 types of Line decoder-

• RZ (Return to zero)
• NRZ (Not return to zero)
• AMI
• Manchester

Manchester Line Decoding:

By comparing the data signal, clock signal, and Manchester encode the signal, we found that we need to invert the clock signal, and then use an XOR to operate the inverted clock signal and Manchester signal. Finally, we can obtain the original data encode the signal.

Advantage:

The DC component of the signal carries no information. This makes it possible that standards that usually do not carry power can transmit this information.

Disadvantage:

One of the drawbacks of this is that it needs more bandwidth than other methods, such as NRZ.

Circuit Connection:

Experimental data:

Input:

Encoder input:

Encoder Output:

Discussion:

• Our input signal was a square wave. The output of line encoder and decoder is also square wave.
• Data output in the experiment and the theoretical data was a little different.
• The output was not perfectly like the message signal but it was close to input.           

Conclusion:

Decoding is the reverse of encoding. It converts encoded data communication transmissions and files to their original states.