Communication Process

The Communication Process

1.      Information Process

 We know that a communication system serves to communication a message or information. This message or information originates in the information source. In general   there can be various messages in the form of words, group of words, code, symbols, sound signal etc. however out of these messages only the desired message is selected and conveyed or communicated.

2.      Input Transducer

A transducer is a device which converts one form of energy into another form. The messages from the information source may not be electrical in nature. In a case when the message produced by the information source is not the electrical in nature, an input transducer is used to convert it into a time varying electrical signal. For example in case of radio broadcasting, a microphone converts the information or messages which is in the form of sound waves into corresponding electrical signal.

3.      Transmitter

The function of the transmitter is to process the electrical signal from different aspects. For example in radio broadcasting signal obtained from signal, is processed to restrict its range of audio frequencies and is often amplified. In wire telephony no real processing is needed, however in long distance radio main function of the transmitter, in modulation the message signal processing such as restriction of range of audio frequency, amplified,  and modulation are achieved. All these processings of the message signal are done just to case the transmission of the signal through the channel.

4.      The channel and the Noise

With reference to the block diagram of a communication system the term channel means the medium through which the message travels fom the transmitter to the receiver. In other words, we can say that the function of the channel is to provide a physical connection between the transmitter and the receiver.

There are two types of channels, namely point to point channels and broadcast channels. Examples of point to point channels are wirelines, microwaves link and optical fibres . Wirelines operated by guided electromagnetic waves and they are used for local telephonic transmission. In case of microwaves links are used in long distance telephone transmission. an optical fibre is a low loss, well controlled, guided optical differently, they all provides a physical medium for the transmission of signals from one point to another point. For these channels the term point to point is used.