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Saturday, 11 March 2017

Communication Systems - I


Elements of Communication:


Two Basic Modes of Communication:
a) Point to point
b) Broadcast

Point to Point Mode of Communication:
Here, communication takes place over a link between a single transmitter and a receiver. Telephony is an example of such a mode of communication.

Broadcast Mode of Communication:
Here, there are a large number of receivers corresponding to a single transmitter. Radio and television are examples of broadcast mode of communication.

Analog Mode of Transmission:
An analog message is physical quantity that varies with time usually in a smooth and continuous fashion.

Digital Mode of Transmission:

A digital message is an ordered sequence of symbols selected from a finite set of discrete elements.
Operational advantages of digital communication system over analog communication systems:
1. An improved security message.
2. Increased immunity to noise and external interference.
3. A common format for encoding different kinds of message signals for the purpose of transmission.
4. Flexibility in configuration digital communication system.

Basic Terminology used in Electronic Communication Systems:
Transducer, signal, noise, transmitter, receiver, attenuation, amplification, range, bandwidth, modulation, demodulation, repeater

Undesirable Effects in the Source of Signal Transmission:
Attenuation, distortion, interference and noise are the undesirable effects in the source of signal transmission.

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