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Chapter: Analog and Digital Communication

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Noise - Analog Communication

Noise is an unwanted electrical signal which gets added on a transmitted signal when it is travelling towards the receiver.

NOISE:

 

 

Noise is an unwanted electrical signal which gets added on a transmitted signal when it is travelling towards the receiver. Electrical noise is defined as any undesired electrical energy. For Example: In audio recording any unwanted electrical signals that fall within the audio frequency band of 0 khz to 15khz will interface with the music and therefore considered as noise.

 

Noise figure is a figure of merit and used to indicate how much the signal to noise ratio gets degraded as a signal passes through a series of circuits.

 

Noise can be divided into two general categories:

 

(i) Correlated Noise : Implies a relationship between the signal and the noise.

 

(ii) Uncorrelated Noise : It is present all the time whether there is a signal or not.

 

Uncorrelated Noise:

 

 

Uncorrelated can be divided into two general categories: (i) External noise and (ii) Internal noise.

 

 

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