Communication:
It is the process of exchanging information from one position to the other. Electronic communication is the transmission, reception and processing of information between two or more locations using electronic circuits.
Elements of communication:
Information signal is given to the transmitter which then transmits the message over the medium to the receiver. Noise gets added up to the message in the channel. It degrades the transmitted information.
Transmitter:
It has a collection of electronic components and circuits which are designed to convert information signal into electronic signals compatible with the medium.
Receiver:
It accepts the transmitted message and converts it back into an understandable form.
Communication channel:
It is the medium by which electronic signal is sent from one location to the other.
Signals which have to be transmitted are converted into electric and magnetic fields that propagate readily over long distances. Also, the medium attenuates the signal which results in the signal degradation. Finally the amplitude of the signal received will be much lower than original signal. Hence, the amplification of the signal should be done both at the transmitter and the receiver.
Noise:
It is the unwanted electrical energy which gets added up with the information signal at the channel.
E.g.: Noise due to lightening i.e., from the atmosphere, Internal noise due to internal agitation of atoms inside the components.
Due to noise message may get completely missed or misinterpreted.
