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  1. Interference of an electrical or acoustical nature. Random noise is a desirable signal used in acoustical measurements. Pink noise is random noise whose spectrum falls at 3 dB per octave: it is useful for use with sound analyzers with constant percentage bandwidths.
  2. Any undesired sound. By extension, noise is any unwanted disturbance within a useful frequency band, such as undesired electric waves in a transmission channel or device. When caused by natural electrical discharges in the atmosphere, noise may be called static.
  3. An erratic, intermittent, or statistically random oscillation.
  4. In electrical circuit analysis, that portion of the unwanted signal which is statistically random, as distinguished from hum, which is an unwanted signal occurring at multiples of the power-supply frequency. If ambiguity exists as to the nature of the noise, a phrase such as acoustic noise or electric noise should be used. Since the above definition are not mutually exclusive, it is usually necessary to depend on context for the distinction.
  5. Interference of an electrical or acoustical nature. Random noise is a desirable signal used in acoustical measurements. Pink noise is random noise whose spectrum falls at 3 dB per octave: it is useful for use with sound analyzers with constant percentage bandwidths. Unwanted, bothersome, or distracting sound. Source: http://www.owenscorning.com/around/sound/glossary.asp

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