Name: Production and Detection of Amplitude Modulated Wave
Uploaded: 2019-07-19
Duration: 10 min 27 s
Description: What is modulation, and why is it necessary? Can telecommunication happen without modulation? Let's find out how to produce and detect modulated waves in thi...

Question

Draw the block diagram of a generalised communication system and explain it briefly.

Accepted Answer

The block diagram of a communication system will have mainly three blocks, they are transmitter, channel and receiver, excluding the information source and user of information (destination blocks). They can be described as:

1. Information source: The objective of any communication system is to convey information from one point to the other. The information source converts this information into physical quantity. The physical manifestation of the information is termed as message signal.

2. Transmitter: The objective of the transmitter block is to collect the incoming message signal and modify it in a suitable fashion, such that, it can be transmitted via the chosen channel to the receiving point. The functionality of the transmitter block is mainly decided by the type or nature of the channel chosen for communication.
3. Channel: Channel is a physical medium which connects the transmitter block with the receiver block. This physical medium includes copper wire, coaxial cable, fibre optic cable, wave guide and free space or atmosphere. The choice of a channel depends on the feasibility and also the purpose of the communication system.

4. Receiver: The receiver block receives the incoming modified version of the message signal from the channel and processes it to recreate the original form of the message signal. There are a great variety of receivers in communication systems, depending on the processing required to recreate the original message signal and also final presentation of the message to the destination.
5. The destination is the final block in the communication system which receives the message signal and processes t to comprehend the information present in it.

Draw the block diagram of a generalised communication system and explain it briefly.

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