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In general usage, noise can be considered data without meaning; that is, data that is not being used to transmit information, but is simply produced as a by-product of other activities.
When speaking of noise in relation to sound, most often it is defined as meaningless sound of greater than usual volume. Thus, a loud activity may be referred to as noisy. However, conversations of other people may be called noise for people not involved in any of them.
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