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In common sense, the word noise means fuss, sound or unwanted noise. In electronics noise can be associated with acoustic perception, such a "wheezing" characteristic (white noise) or to "drizzle" in the poor reception of a television signal. Similarly the grain of a photo, when evident, also has the effect of noise. In signal processing, noise can be understood as a sign meaningless (random), it is important to the signal/noise ratio in communication. In information theory the noise is considered as information carrier.

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