The document summarizes an experiment to study line coding encoder and decoder modules. It introduces that line coding is used as an interface between analog and digital signals and serves purposes like spectrum shaping, removing the DC component, and error detection. It then analyzes various line coding schemes like NRZ-L, NRZ-M, UNI-RZ, BIP-RZ, RZ-AMI, Biφ-L, DICODE-NRZ and duo-binary encoding in both encoders and decoders. While most schemes showed the encoded and decoded signals as expected, the decoded signal for UNI-RZ was not observed though the system was checked to have no issues. The conclusion states that line coding schemes convert analog to digital

1. 23-8-12
Experiment
Line Coding
Aim: To study and get familiar with properties of Line-Code Encoder and Line-Code
Decoder modules.
Introduction:
Its main purpose is to serve as interface between TTL signals and Analog channel and vice-
versa
Line coding is used for various purposes like-
Spectrum Shaping: This are used to reshape and relocate the filter without any
modulation or filtration.
Remove DC component.
Error detection
We analyse NRZ-L, NRZ-M, UNI-RZ, BIP-RZ, RZ-AMI, Biφ-L, DICODE-NRZ and duo-
binary encoding.
Observations and remarks:
Line code ENCODER:
NRZ-L
There is a delay in the o/p of the line code encoder.
NRL-Z

2. UNI-RZ
BIP-RZ

3. RZ-AMI
Biφ-L

4. DICODE-NRZ
Duo-binary Encoding

5. Line code DECODER:
NRZ-L
Note: top one is input, middle one is coded signal and bottol one is decoded signal
NRZ-M

6. BIP-RZ
RZ-AMI

7. BIφ-L
DICODE-NRZ

8. Duo-binary Encoding
UNI-RZ:

9. The decoded signal for unicode-rz scheme was not observed. However we checked the
system and there were no issues.
Conclusion
Line coding schemes are used to convert analog to TTL and vice-versa. This are also used for
various purposes like converting a binary signal to three level or (+-) signal. This are used for
error detection, etc without using any filter or modulation.