Advantage of PCM System:

Lower Noise

PCM (Pulse Code Modulation) is a technique used to digitally represent analog signals. The main advantage of the PCM system is that it provides a lower level of noise as compared to other analog systems.

Explanation:

- Noise is an unwanted signal that is added to the original signal during the transmission process. It can be caused by various factors such as interference, distortion, and attenuation.
- In analog systems, the noise level tends to increase as the signal is transmitted over long distances. This is because the analog signal is affected by various external factors such as temperature, humidity, and electromagnetic interference.
- However, in PCM systems, the analog signal is first converted into a digital signal, which is then transmitted over the communication channel. As the digital signal is less susceptible to external noise, the noise level is significantly reduced in PCM systems.
- Additionally, PCM systems use various error-correction techniques such as parity check and cyclic redundancy check to ensure that the transmitted signal is free from errors. This further reduces the noise level in the system.

Conclusion:

Hence, the main advantage of the PCM system is its ability to provide a lower noise level as compared to other analog systems. This makes it an ideal choice for applications where high-quality transmission is required, such as in the defense sector.