What is electrical communication system?

What is electrical  communication system ?

Electrical communication  is reliable and economical ;communication technology is allievating the 

energy crisis by  trading information processing for a more rational use of energy resources.

 

Some examples:-

1. Teleconferring 

2.Telebanking

3.Teleshopping .

 

Communication system :- The source originates a message ,such 

as a human voice ,a television picter ,a teletype message or a delta .

 If the data is non electric (human voice,teletype message ,television picture), it must be converted by an input  transducer into an electrical wave form referred to as the baseband signal or a message singnal.

 

THE transmitter modifies the baseband signal for efficient transmission .

THE channel is a medium -such as wire ,coaxial cable ,a waveguide ,an optical fiber ,or a radio link 

through which the trasnsmitter is sent .