User:Jyothishbabu/sandbox

=Noise in telecommunications= Noise in telecommunications is defined as any unwanted introduction of energy tending to interfere with the proper reception and reproduction of transmitted signals. These kind of electrical disturbances modify the signal in an unwanted manner. For instants, noise may produce hiss in loudspeaker of radio receivers and "snow" in television receivers. Noise in communication systems are classified into two groups namely External Noise and Internal Noise.

External Noise
Exterenal noise is generated by sources outside the receiver. It can be further classified into created in Earth's atmosphere, Extraterrestrial and Industrial.