random noise

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Random noise represents a nondeterministic fluctuation in the output of an ADC, described by its frequency spectrum and its amplitude statistical properties
  Noise consisting of a large number of transient disturbances with a statistically random time distribution   (188) Note:  Thermal noise is an example of random noise
(See noise, random )
An oscillation whose instantaneous amplitude occur, as a function of time, according to a normal (Gaussian) curve Also called Gaussian noise, random Gaussian noise
random noise