Block Diagram of Communication System: Basics, Working Details, and Signal Propagation

Summary

This video explains the block diagram of a communication system in detail. It covers how information is transmitted from sender to receiver through various channels, including wireless and wired transmission. Key components such as transducers, modulation, and demodulation processes are discussed. The video also explains the conversion of physical quantities into electrical signals, amplification, and noise factors during transmission. Additionally, it explores how receivers decode high-frequency signals into low-frequency information, using amplifiers and transducers to convert the signal back to real-world output like voice or video. The process is described step-by-step to provide clarity on the functioning of communication systems.

Takeaways

• 😀 The communication system involves a sender transmitting information to a receiver through a transmission channel.
• 😀 Transmission channels can be either wireless (using antennas) or wired (using optical or electrical cables).
• 😀 Wireless transmission uses electromagnetic waves, while wired transmission can use optical or electrical cables.
• 😀 The input information can be physical (like voice or video) or electrical, with transducers converting physical quantities into electrical signals.
• 😀 A transducer is used to convert non-electrical information (such as voice) into electrical signals for processing in the communication system.
• 😀 The transmitter block is responsible for modulating the low-frequency, low-energy input signal into a high-frequency, high-energy signal for transmission.
• 😀 Modulation is the process of converting low-frequency signals into high-frequency signals for more efficient transmission.
• 😀 In the transmission channel, noise can be added, especially in wireless communication, affecting the quality of the signal.
• 😀 The receiver block demodulates the high-frequency signal back into low-frequency, low-energy information.
• 😀 The receiver may also include an amplifier that boosts the low-energy received signal into a high-energy signal for further processing.
• 😀 The output information, once demodulated, may require an output transducer (like a speaker) to convert electrical signals back into non-electrical signals (e.g., voice).

Q & A

What is the basic purpose of a communication system?

The basic purpose of a communication system is to transmit information from a sender to a receiver via a channel. This information can be in the form of voice, video, text, or digital data.

What are the two primary types of transmission channels in communication systems?

The two primary types of transmission channels are wireless transmission channels and wired transmission channels. Wireless channels use antennas to transmit electromagnetic waves, while wired channels use optical or electrical cables.

What role does a transducer play in the communication system?

A transducer converts non-electrical information (like voice or video) into electrical signals. For example, a microphone converts voice into an electrical signal.

Why is modulation necessary in the communication system?

Modulation is necessary to convert low-frequency, low-energy information into high-frequency, high-energy signals for transmission. This helps the signal travel efficiently through the transmission channel.

What is the function of the transmitter block in a communication system?

The transmitter block takes the low-frequency input information and converts it into a high-frequency, high-energy signal using modulation. It may also include amplifiers to increase the signal's energy.

What challenges arise during the transmission of signals over a channel?

During transmission, noise is added to the signal, which can distort or degrade the quality of the information. This is especially problematic in wireless channels, where environmental noise can significantly affect the signal.

How does the receiver block function in a communication system?

The receiver block performs the opposite function of the transmitter block. It demodulates the high-frequency signal, converting it back to a low-frequency signal, and amplifies it to restore signal quality.

What happens if the signal is transmitted over a long distance?

When a signal is transmitted over long distances, its energy tends to decrease, resulting in a high-frequency, low-energy signal being received at the receiver end.

What is the role of an output transducer in the communication system?

An output transducer converts electrical signals back into non-electrical signals. For example, a speaker converts electrical signals into audible sound (voice).

What types of transmission channels are used in wired communication systems?

In wired communication systems, two types of channels are used: optical channels (which use optical fiber cables) and electrical channels (which use electrical cables).