White noise and Autocorrelation

Define the following term:

a) White noise

b) Autocorrelation

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White noise :

A stationary random process is known as white noise in case its power density spectrum remains constant. Thus, the white noise has the flat frequency response spectrum.

Autocorrelation :

The autocorrelation of the sequence refers to the correlation of the sequence having its shifted version, and this signify how fast the signal changes.
SX (w) = σx2, -π ≤ wπ

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