ABSTRACT
Noise is any unwanted signal and every kind of circuit is subject to it. When a radio receiver is turned up to full volume, but is not tuned to a station, there is a steady hiss from the speaker. This noise is noise in the electronic sense. It may have originated in the circuit of the radio set, in the surrounding district, or in space. But noise does not have to be audible noise. A TV set that is not tuned to a station shows ‘snow’ on its screen. This too is noise. In digital data transmission, noise is the erratic reception of 1’s for 0’s or 0’s for 1’s. Obviously, noise is something that must be reduced or preferably eliminated.
